ASTM D7548-22

Standard Test Method for Determination of Accelerated Iron Corrosion in Petroleum Products

SIGNIFICANCE AND USE
5.1 In general, wherever the possibility exists of water getting mixed with products/material (covered under 1.1) the results obtained by this test method will indicate the degree to which corrosion of iron components can be expected.  
5.2 Test also determines the antirust properties of products/material (covered under 1.1) in preparation for the various stages through which the tested product may pass prior to or during its transport through a pipeline.  
5.3 Test results are also meant to show whether or not the dosage levels and type of iron corrosion inhibitor added to a product/material (covered under 1.1) is sufficient for achieving the desired protection of affected assets such as storage tanks, process lines, and shipment systems.
SCOPE
1.1 This test method covers an accelerated laboratory and field procedure for the determination of corrosion of iron, in the presence of water, on samples such as gasoline and gasoline blended with 10 % ethanol, E10 (Specification D4814); gasoline-blend components (except butane); diesel fuel and biodiesel B5, except Grade No. 4-D (Specification D975); biodiesel B6 to B20 (Specification D7467); diesel-blend component such as light cycle-oil; No. 1 fuel oil, No. 2 fuel oil (Specification D396); aviation turbine fuel (Specification D1655).  
1.2 The values stated in SI units are to be regarded as the standard.  
1.2.1 Exception—Values in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2022
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.14 - Stability, Cleanliness and Compatibility of Liquid Fuels

Relations

• Refers: ASTM D1655-24 - Standard Specification for Aviation Turbine Fuels
• Effective Date: 15-Mar-2024
• Refers: ASTM A108-24 - Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished
• Effective Date: 01-Mar-2024
• Refers: ASTM D4814-24 - Standard Specification for Automotive Spark-Ignition Engine Fuel
• Effective Date: 01-Jan-2024
• Refers: ASTM D975-23a - Standard Specification for Diesel Fuel
• Effective Date: 15-Dec-2023
• Refers: ASTM D4175-23a - Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• Effective Date: 15-Dec-2023
• Refers: ASTM D665-23 - Standard Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
• Effective Date: 01-Dec-2023
• Refers: ASTM D4814-23a - Standard Specification for Automotive Spark-Ignition Engine Fuel
• Effective Date: 01-Dec-2023
• Refers: ASTM D7467-23 - Standard Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
• Effective Date: 01-Oct-2023
• Refers: ASTM D1655-23a - Standard Specification for Aviation Turbine Fuels
• Effective Date: 01-Oct-2023
• Refers: ASTM D4175-23e1 - Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• Effective Date: 01-Jul-2023
• Refers: ASTM D7467-20a - Standard Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
• Effective Date: 01-Jun-2020
• Refers: ASTM D4814-20 - Standard Specification for Automotive Spark-Ignition Engine Fuel
• Effective Date: 01-Feb-2020
• Refers: ASTM D7467-20 - Standard Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
• Effective Date: 01-Jan-2020
• Refers: ASTM D396-19a - Standard Specification for Fuel Oils
• Effective Date: 15-Dec-2019
• Refers: ASTM D4814-19a - Standard Specification for Automotive Spark-Ignition Engine Fuel
• Effective Date: 01-Dec-2019

Overview

ASTM D7548-22, "Standard Test Method for Determination of Accelerated Iron Corrosion in Petroleum Products," provides a standardized laboratory and field procedure to evaluate how petroleum products-such as gasoline, ethanol-blended gasoline, diesel, and biodiesel-corrode iron when water is present. Developed by ASTM International, this test method is essential for the petroleum and fuel industry to assess both the propensity for corrosion in storage, transport, and use, as well as the effectiveness of corrosion inhibitors.

Iron corrosion can damage assets such as storage tanks, pipelines, and transport systems. By identifying the degree of corrosion that may occur, this standard helps to protect critical infrastructure, ensure product quality, and minimize costly maintenance and repairs.

Key Topics

• Purpose: Evaluates the potential for iron corrosion in petroleum products when exposed to water and tests the effectiveness of corrosion inhibitors.
• Products Covered: Includes gasoline (and E10 ethanol blends), diesel (including B5 and B6-B20 biodiesel blends), aviation turbine fuel, light cycle oil, No. 1 and No. 2 fuel oils, and related components.
• Sample Testing: Involves immersing a test rod made of specified steel grades in a sample held at controlled temperatures, followed by visual assessment and rating of corrosion using an established chart.
• Test Outcomes: Produces a qualitative corrosion rating, useful for predicting real-world corrosion issues and validating inhibitor dosage and performance.
• Units and Conditions: The standard uses SI units as primary and mandates safety, health, and environmental considerations for all operations.

Applications

• Quality Control: Ensures that storage and transport systems for petroleum products, such as tanks, pipelines, and shipment containers, are resistant to iron corrosion when water contamination occurs.
• Product Development: Allows fuel producers and additive manufacturers to evaluate and optimize corrosion inhibitor formulations.
• Compliance: Supports regulatory and industry requirements for fuel handling and transportation, minimizing asset degradation and helping maintain product integrity.
• Risk Assessment: Provides crucial data to operators and engineers for predicting and mitigating corrosion-related failures and maintenance costs.
• Operational Decision-Making: Enables stakeholders to select appropriate fuels or additives for specific conditions (for example, in regions with high humidity or water ingress risks).

Related Standards

• ASTM D665: Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
• ASTM D396: Specification for Fuel Oils (covers No. 1 and No. 2 fuel oils referenced in D7548-22)
• ASTM D975: Specification for Diesel Fuel Oils (applies to diesel and biodiesel blends tested)
• ASTM D4814: Specification for Automotive Spark-Ignition Engine Fuel (defines gasoline and E10 blends)
• ASTM D7467: Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
• ASTM D1655: Specification for Aviation Turbine Fuels
• ASTM D4175: Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants (provides definitions relevant to this and other standards)

By leveraging ASTM D7548-22, organizations in the petroleum industry can proactively address iron corrosion risks in fuels, ensure compliance with best practices, and protect valuable infrastructure from premature deterioration. This standard supports robust asset management and the reliable delivery of high-quality fuels across the value chain.

Keywords: accelerated iron corrosion, petroleum products, corrosion inhibitors, corrosion testing, ASTM D7548, fuel quality, storage tank protection, pipeline corrosion, fuel additive performance, petroleum standards

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7548 − 22
Standard Test Method for
Determination of Accelerated Iron Corrosion in Petroleum
Products
This standard is issued under the fixed designation D7548; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* D396Specification for Fuel Oils
D665Test Method for Rust-Preventing Characteristics of
1.1 This test method covers an accelerated laboratory and
Inhibited Mineral Oil in the Presence of Water
field procedure for the determination of corrosion of iron, in
D975Specification for Diesel Fuel
thepresenceofwater,onsamplessuchasgasolineandgasoline
D1193Specification for Reagent Water
blended with 10 % ethanol, E10 (Specification D4814);
D1655Specification for Aviation Turbine Fuels
gasoline-blend components (except butane); diesel fuel and
D4175Terminology Relating to Petroleum Products, Liquid
biodiesel B5, except Grade No. 4-D (Specification D975);
Fuels, and Lubricants
biodiesel B6 to B20 (Specification D7467); diesel-blend com-
D4814Specification for Automotive Spark-Ignition Engine
ponent such as light cycle-oil; No. 1 fuel oil, No. 2 fuel oil
Fuel
(Specification D396); aviation turbine fuel (Specification
D7467Specification for Diesel Fuel Oil, Biodiesel Blend
D1655).
(B6 to B20)
1.2 The values stated in SI units are to be regarded as the
G15TerminologyRelatingtoCorrosionandCorrosionTest-
standard.
ing (Withdrawn 2010)
1.2.1 Exception—Values in parentheses are for information
2.2 Other Standards:
only. 4
British Standard BS970–1:070M20 or European Steel
1.3 This standard does not purport to address all of the
C22E Number 1.1151—Carbon and Carbon Manganese
safety concerns, if any, associated with its use. It is the
Steels including Free Cutting Steels
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.1 Definitions:
1.4 This international standard was developed in accor-
3.1.1 For definitions of terms used in this test method, refer
dance with internationally recognized principles on standard-
to Terminology D4175.
ization established in the Decision on Principles for the
3.1.2 corrosion, n—chemical or electrochemical reaction
Development of International Standards, Guides and Recom-
between a material, usually a metal, and its environment that
mendations issued by the World Trade Organization Technical
producesadeteriorationofthematerialanditsproperties. G15
Barriers to Trade (TBT) Committee.
3.1.3 rust, n—corrosion product consisting primarily of
hydrated iron oxide.
2. Referenced Documents
3.1.3.1 Discussion—Rust is a term properly applied only to
2.1 ASTM Standards:
ferrous alloys. G15
A108Specification for Steel Bar, Carbon and Alloy, Cold-
3.2 Acronyms:
Finished
3.2.1 TP—temperature probe.
D97Test Method for Pour Point of Petroleum Products
4. Summary of Test Method
This test method is under the jurisdiction of ASTM Committee D02 on
4.1 Apolishedironcorrosiontest-rodisimmersedin50mL
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
of the sample being tested and heated to 37.8°C (100°F), at
Subcommittee D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels.
Current edition approved May 1, 2022. Published May 2022. Originally
ɛ1
approvedin2009.Lastpreviouseditionapprovedin2022asD7548–16a(2022) .
DOI: 10.1520/D7548-22 The last approved version of this historical standard is referenced on
For referenced ASTM standards, visit the ASTM website, www.astm.org, or www.astm.org.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Annual Book of IP Standard Methods for Analysis and Testing of Petroleum and
Standards volume information, refer to the standard’s Document Summary page on Related Products, Vol 2. Available from Energy Institute, 61 New Cavendish St.,
the ASTM website. London, W1G 7AR, U.K., http://www.energyinst.org.
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
D7548 − 22
7,6
which point 5mLof reagent water,Type III or better, is added 6.4 Cover, Test Jar—Plastic, such as high density poly-
to the sample. Sample temperature is maintained between ethylene (HDPE), with three holes, meeting dimensions and
37°C to 39°C (98°F to 102°F), with the target being 37.8°C features seen and outlined in A1.2.
8,6
(100°F), for 1h. At the end of the heating period, test-rod is
6.5 Corrosion Test Rod, with a plastic or polytetrafluoro-
removed, rinsed, and examined for the degree/category of
ethylene (PTFE) holder and nominal dimensions according to
corrosion against the “ASTM Iron Corrosion Rating Chart-
Fig. A1.3; round, threaded steel rod, tapered at one end;
–Test Method D7548.”
81.0mm (3.19in.) long, including the 12.7mm (0.5in.) long
threaded portion, and 12.7mm (0.5in.) in diameter. See Fig.
5. Significance and Use
A1.3. Test rod should be made of steel conforming to Grade
5.1 In general, wherever the possibility exists of water
1015, 1018, 1020, or 1025 of Specification A108,orto
getting mixed with products/material (covered under 1.1) the
European Steel C22E number 1.1151, or to British Standard
results obtained by this test method will indicate the degree to
BS970–1) as per Table 1. If these steels are unavailable, other
which corrosion of iron components can be expected.
equivalent steels may be used, provided they are satisfactory
according to comparative tests using this test method.
5.2 Testalsodeterminestheantirustpropertiesofproducts/
8,6
6.5.1 Holder, ethanol-resistant plastic or PTFE with
material (covered under 1.1) in preparation for the various
nominal dimensions according to Fig. A1.3. Total length:
stages through which the tested product may pass prior to or
63.5mm (2.5in.), with a 2-step handle at top that is disc-type,
during its transport through a pipeline.
22.2mm 6 0.1mm (0.875 in. 6 0.004 in.) in diameter by
5.3 Test results are also meant to show whether or not the
15.9mm (0.625in.) thick. Below this is a circular step or rim
dosage levels and type of iron corrosion inhibitor added to a
which is 17.1mm (0.63in.) diameter by 6.4mm (0.25in.)
product/material (covered under 1.1) is sufficient for achieving
thick. The stem portion of the holder is 41.2mm (1.622in.)
the desired protection of affected assets such as storage tanks,
longby12.7mm(0.5in.)indiameter,witha6.4mm(0.25in.)
process lines, and shipment systems.
female-threadedholeinthebottomtoacceptthemale-threaded
test rod.
6. Apparatus
5,6
6.6 Temperature Probe, Digital, calibrated, with stem about
6.1 Stirring Hotplate, Single or multi-position (see Ap-
200mm (8in.) long by 3.0mm (0.125in.) in diameter and
pendix X1), ceramic top, capable of accommodating Acceler-
covering a temperature range of about 20°C (68°F) to at least
ated Iron Corrosion Test (AICT) apparatus specified in A1.1.
60°C (140°F).
Stirrer should be capable of stirring at a rate of 900r⁄min 6
100r⁄min.
NOTE3—Calibrated,digitaltemperatureprobe,orequivalentcalibrated
temperature measurement device, covering a range of –50°C (–58°F) to
6.2 Water Bath—Beaker, 150mLto 200mLcapacity, boro-
+300°C (+572°F) will be suitable. Alternatively, calibrated thermo-
silicate glass, containing 100mL of distilled water, or other
couples may be used.
typeofwaterbathcapableofaccommodatingAcceleratedIron
6.7 Stirring Bar—Magnetic, PTFE (polytetrafluoro-
Corrosion Test (AICT) apparatus specified in A1.1.
ethylene)-coated, 25.4mm 6 2.54mm (1.0in. 6 0.1in.) long
6.3 Test Jar—Cylindrical, clear glass, 90mL capacity, flat by 8mm 6 0.8mm (0.31in. 6 0.03in.) in diameter.
bottom, 115mm to 125mm (4.53in. to 4.92in.) in height,
33.2mm to 34.8mm (1.31in. to 1.37in.) outside diameter, The sole source of supply of the apparatus “Super-Nuova” Multi position
stirring hot plate, Model No. SP135935Q known to the committee at this time is
30.0mm to 32.4mm (1.18in. to 1.28in.) inside diameter,
Thermo Fisher Scientific, 2000 Park Lane Dr., Pittsburgh, PA 15275-9952.
1.6mm (0.06in.) maximum wall thickness.
If you are aware of alternative suppliers, please provide this information to
NOTE 1—The pour point test jar specified in Test Method D97 meets
ASTM International Headquarters. Your comments will receive careful consider-
this requirement.Atest jar meeting requirements of 6.3 and graduated at
ation at a meeting of the responsible technical committee, which you may attend.
50mL is more suitable.
The sole source of supply of the test jar cover known to the committee at this
NOTE 2—Optionally, to prevent accidental breakage of the test jar, a
time isK&C Manufacturing, 210 S. Main, Newkirk, OK 74647.
rubber O-ring, 32mm (1.25in.) inside diameter, and 3mm (0.12in.)
The sole source of supply of the apparatus, with complete set of test
thick, could be slipped over the test jar up to about 25mm (1.0in.) below accessories, known to the committee at this time is Koehler Instruments Co., 1595
its rim. Sycamore Ave, Bohemia, NY 11716.
TABLE 1 Chemical Composition of Corrosion Test Rods
ChemicalAnalysis—Content (%)
A108 C22E BS970–1
Element
A
1015 1018 1020 1025 1.1151 070 M20
Min Max Min Max Min Max Min Max Min Max Min Max
Iron, Fe 99.13 99.57 98.81 99.26 99.08 99.53 99.03 99.48 98.365 99.43 98.36 99.24
Carbon, C 0.13 0.18 0.14 0.2 0.17 0.23 0.22 0.28 0.17 0.24 0.16 0.24
Manganese, Mn 0.3 0.6 0.6 0.9 0.3 0.6 0.3 0.6 0.4 0.7 0.5 0.9
Sulfur, S 0 0.05 0 0.05 0 0.05 0 0.05 0 0.035 0 0.05
Phosphorous, P 0 0.04 0 0.04 0 0.04 0 0.04 0 0.03 0 0.05
Silicon, Si 0 0 0 0 0 0.4 0.1 0.4
Nickel, Ni 0 0 0 0 0 0.4 0
Chromium, Cr 0 0 0 0 0 0.4 0
A
(Cr + Mo + Ni = 0.63 )
max
D7548 − 22
6.8 Syringe—Plastic, 5mL, with 63.5mm (2.5in.) long 8.3.2 Polish the test rod just enough to get rid of rust/other
needle,5ccsyringeandneedle,oranyotherequivalentsyringe spots; do not overpolish. Discard used test rods when the
and needle. diameter is reduced to 9.5mm (0.375in.) as indicated in Fig.
A1.3.
6.9 Timing Device—Electronic or manual, capable of mea-
8.3.3 Toensurethattheflatshoulder(thatportionofthetest
suring the test duration with an accuracy of at least 1%.
rodwhichisperpendiculartothethreadedstem)isfreeofrust,
6.10 Grinding and Polishing Apparatus—Any suitable
polishthisareabyholdingastripoftheabrasiveclothbetween
apparatus, with a mounting or bench stand, capable of rotating
thechuckandtheshoulderwhilerotatingthetestrodforabrief
at 1700r⁄min to 1800r⁄min, and having the means to mount a
period.
9,6
suitable chuck into which the corrosion test rod can be
8.3.4 With the polisher still in operation, pass the brush
screwed in. See A1.4.
gently over the entire surface of the corrosion test rod to
remove the remains of the abrasive cloth and other foreign
7. Reagents and Materials
matter.
7.1 Reagent Water—TypeIIIorbetter,SpecificationD1193.
NOTE 4
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D7548 − 16a (Reapproved 2022) D7548 − 22
Standard Test Method for
Determination of Accelerated Iron Corrosion in Petroleum
Products
This standard is issued under the fixed designation D7548; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Editorially corrected 13.1 in April 2022.
1. Scope Scope*
1.1 This test method covers an accelerated laboratory and field procedure for the determination of corrosion of iron, in the
presence of water, on samples such as gasoline and gasoline blended with 10 % ethanol, E10 (Specification D4814); gasoline-blend
components (except butane); diesel fuel and biodiesel B5, except Grade No. 4-D (Specification D975); biodiesel B6 to B20
(Specification D7467); diesel-blend component such as light cycle-oil; No.1 No. 1 fuel oil, No.2 No. 2 fuel oil (Specification
D396); aviation turbine fuel (Specification D1655).
1.2 The values stated in SI units are to be regarded as the standard.
1.2.1 Exception—Values in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A108 Specification for Steel Bar, Carbon and Alloy, Cold-Finished
D97 Test Method for Pour Point of Petroleum Products
D396 Specification for Fuel Oils
D665 Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
D975 Specification for Diesel Fuel
D1193 Specification for Reagent Water
D1655 Specification for Aviation Turbine Fuels
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D4814 Specification for Automotive Spark-Ignition Engine Fuel
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels.
Current edition approved April 1, 2022May 1, 2022. Published April 2022May 2022. Originally approved in 2009. Last previous edition approved in 20162022 as
ɛ1
D7548 – 16a.D7548 – 16a (2022) . DOI: 10.1520/D7548-16AR22E01.10.1520/D7548-22
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7548 − 22
D7467 Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
G15 Terminology Relating to Corrosion and Corrosion Testing (Withdrawn 2010)
2.2 Other Standards:
British Standard BS970–1:070M20 or European Steel C22E Number 1.1151—Carbon and Carbon Manganese Steels including
Free Cutting Steels
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
3.1.2 corrosion, n—chemical or electrochemical reaction between a material, usually a metal, and its environment that produces
a deterioration of the material and its properties. G15
3.1.3 rust, n—corrosion product consisting primarily of hydrated iron oxide.
3.1.3.1 Discussion—
Rust is a term properly applied only to ferrous alloys. G15
3.2 Acronyms:
3.2.1 TP—temperature probe.
4. Summary of Test Method
4.1 A polished iron corrosion test-rod is immersed in 50 mL of the sample being tested and heated to 37.8 °C (100 °F), at which
point 5 mL of reagent water, Type III or better, is added to the sample. Sample temperature is maintained between 37 °C to 39 °C
(98 °F to 102 °F), with the target being 37.8 °C (100 °F), for 1 h. At the end of the heating period, test-rod is removed, rinsed, and
examined for the degree/category of corrosion against the “ASTM Iron Corrosion Rating Chart–Test Method D7548.”
5. Significance and Use
5.1 In general, wherever the possibility exists of water getting mixed with products/material (covered under 1.1) the results
obtained by this test method will indicate the degree to which corrosion of iron components can be expected.
5.2 Test also determines the antirust properties of products/material (covered under 1.1) in preparation for the various stages
through which the tested product may pass prior to or during its transport through a pipeline.
5.3 Test results are also meant to show whether or not the dosage levels and type of iron corrosion inhibitor added to a
product/material (covered under 1.1) is sufficient for achieving the desired protection of affected assets such as storage tanks,
process lines, and shipment systems.
6. Apparatus
5,6
6.1 Stirring Hotplate, Single or multi-position (see Appendix X1), ceramic top, capable of accommodating Accelerated Iron
Corrosion Test (AICT) apparatus specified in A1.1. Stirrer should be capable of stirring at a rate of 900 r ⁄min 6 100 r ⁄min.
6.2 Water Bath—Beaker, 150 mL to 200 mL capacity, borosilicate glass, containing 100 mL of distilled water, or other type of
water bath capable of accommodating Accelerated Iron Corrosion Test (AICT) apparatus specified in A1.1.
The last approved version of this historical standard is referenced on www.astm.org.
Annual Book of IP Standard Methods for Analysis and Testing of Petroleum and Related Products, Vol 2. Available from Energy Institute, 61 New Cavendish St., London,
W1G 7AR, U.K., http://www.energyinst.org.
The sole source of supply of the apparatus “Super-Nuova” Multi position stirring hot plate, Model No. SP135935Q known to the committee at this time is Thermo Fisher
Scientific, 2000 Park Lane Dr., Pittsburgh, PA 15275-9952.
If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a
meeting of the responsible technical committee, which you may attend.
D7548 − 22
6.3 Test Jar—Cylindrical, clear glass, 90 mL capacity, flat bottom, 115 mm to 125 mm (4.53 in. to 4.92 in.) in height, 33.2 mm
to 34.8 mm (1.31 in. to 1.37 in.) outside diameter, 30.0 mm to 32.4 mm (1.18 in. to 1.28 in.) inside diameter, 1.6 mm (0.06 in.)
maximum wall thickness.
NOTE 1—The pour point test jar specified in Test Method D97 meets this requirement. A test jar meeting requirements of 6.3 and graduated at 50 mL is
more suitable.
NOTE 2—Optionally, to prevent accidental breakage of the test jar, a rubber O-ring, 32 mm (1.25 in.) inside diameter, and 3 mm (0.12 in.) thick, could
be slipped over the test jar up to about 25 mm (1.0 in.) below its rim.
7,6
6.4 Cover, Test Jar—Plastic, such as high density polyethylene (HDPE), with three holes, meeting dimensions and features seen
and outlined in A1.2.
8,6
6.5 Corrosion Test Rod, with a plastic or polytetrafluoroethylene (PTFE) holder and nominal dimensions according to Fig. A1.3;
round, threaded steel rod, tapered at one end; 81.0 mm (3.19 in.) long, including the 12.7 mm (0.5 in.) long threaded portion, and
12.7 mm (0.5 in.) in diameter. See Fig. A1.3. Test rod should be made of steel conforming to Grade 1015, 1018, 1020, or 1025
of Specification A108, or to European Steel C22E number 1.1151, or to British Standard BS970–1) as per Table 1. If these steels
are unavailable, other equivalent steels may be used, provided they are satisfactory according to comparative tests using this test
method.
8,6
6.5.1 Holder, ethanol-resistant plastic or PTFE with nominal dimensions according to Fig. A1.3. Total length: 63.5 mm (2.5 in.),
with a 2-step handle at top that is disc-type, 22.2 mm 6 0.1 mm (0.875 in. 6 0.004 in.) in diameter by 15.9 mm (0.625 in.) thick.
Below this is a circular step or rim which is 17.1 mm (0.63 in.) diameter by 6.4 mm (0.25 in.) thick. The stem portion of the holder
is 41.2 mm (1.622 in.) long by 12.7 mm (0.5 in.) in diameter, with a 6.4 mm (0.25 in.) female-threaded hole in the bottom to accept
the male-threaded test rod.
6.6 Temperature Probe, Digital, calibrated, with stem about 200 mm (8 in.) long by 3.0 mm (0.125 in.) in diameter and covering
a temperature range of about 20 °C (68 °F) to at least 60 °C (140 °F).
NOTE 3—Calibrated, digital temperature probe, or equivalent calibrated temperature measurement device, covering a range of –50 °C (–58 °F) to +300 °C
(+572 °F) will be suitable. Alternatively, calibrated thermocouples may be used.
6.7 Stirring Bar—Magnetic, PTFE (polytetrafluoroethylene)-coated, 25.4 mm 6 2.54 mm (1.0 in. 6 0.1 in.) long by 8 mm 6
0.8 mm (0.31 in. 6 0.03 in.) in diameter.
6.8 Syringe—Plastic, 5 mL, with 63.5 mm (2.5 in.) long needle, 5 cc syringe and needle, or any other equivalent syringe and
needle.
6.9 Timing Device—Electronic or manual, capable of measuring the test duration with an accuracy of at least 1 %.
TABLE 1 Chemical Composition of Corrosion Test Rods
Chemical Analysis—Content (%)
A108 C22E BS970–1
Element
A
1015 1018 1020 1025 1.1151 070 M20
Min Max Min Max Min Max Min Max Min Max Min Max
Iron, Fe 99.13 99.57 98.81 99.26 99.08 99.53 99.03 99.48 98.365 99.43 98.36 99.24
Carbon, C 0.13 0.18 0.14 0.2 0.17 0.23 0.22 0.28 0.17 0.24 0.16 0.24
Manganese, Mn 0.3 0.6 0.6 0.9 0.3 0.6 0.3 0.6 0.4 0.7 0.5 0.9
Sulfur, S 0 0.05 0 0.05 0 0.05 0 0.05 0 0.035 0 0.05
Phosphorous, P 0 0.04 0 0.04 0 0.04 0 0.04 0 0.03 0 0.05
Silicon, Si 0 0 0 0 0 0.4 0.1 0.4
Nickel, Ni 0 0 0 0 0 0.4 0
Chromium, Cr 0 0 0 0 0 0.4 0
A
(Cr + Mo + Ni = 0.63 )
max
The sole source of supply of the test jar cover known to the committee at this time is K & C Manufacturing, 210 S. Main, Newkirk, OK 74647.
The sole source of supply of the apparatus, with complete set of test accessories, known to the committee at this time is Koehler Instruments Co., 1595 Sycamore Ave,
Bohemia, NY 11716.
D7548 − 22
6.10 Grinding and Polishing Apparatus—Any suitable apparatus, with a mounting or bench stand, capable of rotating at
9,6
1700 r ⁄min to 1800 r ⁄min, and having the means to mount a suitable chuck into which the corrosion test rod can be screwed in.
See A1.4.
7. Reagents and Materials
7.1 Reagent Water—Type III or better, Specification D1193.
7.2 Wash Solvent.
7.2.1 2,2,4-trimethylpentane (isooctane)—Minimum 99.75 % purity. (Warning—Flammable. Health hazard.)
7.2.2 Acetone—Minimum 99.5 % purity. (Warning—Flammable. Health hazard.)
7.3 Hydrochloric Acid (HCl)—Prepare 15 % solution by dissolving 42 mL of concentrated HCl in 100 mL distilled water.
(Warning—Corrosive. Burn hazard.)
10,6
7.4 Polishing Material—Abrasive cloth roll; silicon carbide, C-100 open mesh, 38 mm width by 22.5 m length (1.5 in. by
25 yd) roll.
7.5 Magnifier—Lighted, 2× magnification power.
7.6 Lintless Cloth or T
...