ASTM D2688-15

Standard Test Method for Corrosivity of Water in the Absence of Heat Transfer (Weight Loss Method)

SIGNIFICANCE AND USE
4.1 Since the two tendencies are inseparable for a metal to corrode and for water and the materials it contains to promote or inhibit corrosion, the corrosiveness of a material or the corrosivity of water must be determined in relative, rather than absolute, terms. The tendency for a material to corrode is normally determined by measuring its rate of corrosion and comparing it with the corrosion rates of other materials in the same water environment. Conversely, the relative corrosivity of water may be determined by comparing the corrosion rate of a material in the water with the corrosion rates of the same material in other waters. Such tests are useful, for example, for evaluating the effects of corrosion inhibitors on the corrosivity of water. Although this test methods is intended to determine the corrosivity of water, it is equally useful for determining corrosiveness and corrosion rate of materials. Examples of systems in which this method may be used include but are not limited to open recirculating cooling water and closed chilled and hydronic heating systems.
SCOPE
1.1 This test method covers the determination of the corrosivity of water by evaluating pitting and by measuring the weight loss of metal specimens. Pitting is a form of localized corrosion: weight loss is a measure of the average corrosion rate. The rate of corrosion of a metal immersed in water is a function of the tendency for the metal to corrode and is also a function of the tendency for water and the materials it contains to promote (or inhibit) corrosion.  
1.2 The test method employs flat, rectangular-shaped metal coupons which are mounted on pipe plugs and exposed to the water flowing in metal piping in municipal, building, and industrial water systems using a side stream corrosion specimen rack.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.  
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2015
• ICS: 13.060.60 - Examination of physical properties of water
• Technical Committee: D19 - Water
• Drafting Committee: D19.03 - Sampling Water and Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water

Relations

• Replaces: ASTM D2688-11 - Standard Test Method for Corrosivity of Water in the Absence of Heat Transfer (Weight Loss Method)
• Effective Date: 01-Jun-2015
• Replaced By: ASTM D2688-15e1 - Standard Test Method for Corrosivity of Water in the Absence of Heat Transfer (Weight Loss Method)
• Effective Date: 01-Jun-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D2688 − 15
StandardTest Method for
Corrosivity of Water in the Absence of Heat Transfer
1
(Weight Loss Method)
This standard is issued under the fixed designation D2688; 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 G1Practice for Preparing, Cleaning, and Evaluating Corro-
sion Test Specimens
1.1 This test method covers the determination of the corro-
G16Guide for Applying Statistics to Analysis of Corrosion
sivity of water by evaluating pitting and by measuring the
Data
weight loss of metal specimens. Pitting is a form of localized
corrosion: weight loss is a measure of the average corrosion
3. Terminology
rate. The rate of corrosion of a metal immersed in water is a
3.1 Definitions—For definitions of terms used in this
function of the tendency for the metal to corrode and is also a
standard, refer to Terminology D1129.
functionofthetendencyforwaterandthematerialsitcontains
to promote (or inhibit) corrosion.
4. Significance and Use
1.2 The test method employs flat, rectangular-shaped metal
4.1 Since the two tendencies are inseparable for a metal to
coupons which are mounted on pipe plugs and exposed to the
corrode and for water and the materials it contains to promote
water flowing in metal piping in municipal, building, and
or inhibit corrosion, the corrosiveness of a material or the
industrial water systems using a side stream corrosion speci-
corrosivity of water must be determined in relative, rather than
men rack.
absolute, terms. The tendency for a material to corrode is
1.3 The values stated in SI units are to be regarded as
normally determined by measuring its rate of corrosion and
standard. The values given in parentheses are mathematical
comparing it with the corrosion rates of other materials in the
conversions to inch-pound units that are provided for informa-
same water environment. Conversely, the relative corrosivity
tion only and are not considered standard.
ofwatermaybedeterminedbycomparingthecorrosionrateof
1.4 This standard does not purport to address all of the
a material in the water with the corrosion rates of the same
safety concerns, if any, associated with its use. It is the
materialinotherwaters.Suchtestsareuseful,forexample,for
responsibility of the user of this standard to establish appro-
evaluating the effects of corrosion inhibitors on the corrosivity
priate safety and health practices and determine the applica-
of water. Although this test methods is intended to determine
bility of regulatory limitations prior to use.
the corrosivity of water, it is equally useful for determining
corrosiveness and corrosion rate of materials. Examples of
2. Referenced Documents
systems in which this method may be used include but are not
2
2.1 ASTM Standards:
limited to open recirculating cooling water and closed chilled
D1129Terminology Relating to Water
and hydronic heating systems.
D2331Practices for Preparation and Preliminary Testing of
Water-Formed Deposits 5. Composition of Specimens
D2777Practice for Determination of Precision and Bias of
5.1 The specimens shall be similar in composition to the
Applicable Test Methods of Committee D19 on Water
piping in the system in which the corrosion test is being made.
6. Effect of Cold Working on Corrosion
1
This test method is under the jurisdiction ofASTM Committee D19 on Water
and is the direct responsibility of Subcommittee D19.03 on Sampling Water and
6.1 Cold working can be important in causing localized
Water-Formed Deposits,Analysis of Water for Power Generation and Process Use,
corrosion; however, plastic deformation can be minimized in
On-Line Water Analysis, and Surveillance of Water.
specimen preparation by following proper machining practices
Current edition approved June 1, 2015. Published June 2015. Originally
3
approved in 1969. Last previous edition approved in 2011 as D2688–11. DOI:
(1) (for example, drilling, reaming, and cutting specimens).
10.1520/D2688-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
the ASTM website. this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D2688 − 15
7. Types of Corrosion
7.1 General Corrosion—Characterizedbyuniformattackof 10.2 The presence of different metals in close proximity to
th
...

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.
Designation: D2688 − 11 D2688 − 15
Standard Test Method for
Corrosivity of Water in the Absence of Heat Transfer
1
(Weight Loss Method)
This standard is issued under the fixed designation D2688; 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.
1. Scope
1.1 This test method covers the determination of the corrosivity of water by evaluating pitting and by measuring the weight loss
of metal specimens. Pitting is a form of localized corrosion: weight loss is a measure of the average corrosion rate. The rate of
corrosion of a metal immersed in water is a function of the tendency for the metal to corrode and is also a function of the tendency
for water and the materials it contains to promote (or inhibit) corrosion.
1.2 The test method employs flat, rectangular-shaped metal coupons which are mounted on pipe plugs and exposed to the water
flowing in metal piping in municipal, building, and industrial water systems using a side stream corrosion specimen rack.
1.3 The values stated in SI units are to be regarded as standard, other units Values standard. The values given in parenthesis are
for information only.parentheses are mathematical conversions to inch-pound units that are provided for information only and are
not considered standard.
1.4 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D1129 Terminology Relating to Water
D2331 Practices for Preparation and Preliminary Testing of Water-Formed Deposits
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
G16 Guide for Applying Statistics to Analysis of Corrosion Data
3. Terminology
3.1 Definitions: Definitions—For definitions of terms used in this test method, standard, refer to Terminology D1129.
4. Significance and Use
4.1 Since the two tendencies are inseparable for a metal to corrode and for water and the materials it contains to promote or
inhibit corrosion, the corrosiveness of a material or the corrosivity of water must be determined in relative, rather than absolute,
terms. The tendency for a material to corrode is normally determined by measuring its rate of corrosion and comparing it with the
corrosion rates of other materials in the same water environment. Conversely, the relative corrosivity of water may be determined
by comparing the corrosion rate of a material in the water with the corrosion rates of the same material in other waters. Such tests
are useful, for example, for evaluating the effects of corrosion inhibitors on the corrosivity of water. Although this test methods
is intended to determine the corrosivity of water, it is equally useful for determining corrosiveness and corrosion rate of materials.
Examples of systems in which this method may be used include but are not limited to open recirculating cooling water and closed
chilled and hydronic heating systems.
1
This test method is under the jurisdiction of ASTM Committee D19 on Water and is the direct responsibility of Subcommittee D19.03 on Sampling Water and
Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water.
Current edition approved Feb. 1, 2011June 1, 2015. Published April 2011June 2015. Originally approved in 1969. Last previous edition approved in 20052011 as
ε1
D2688 – 05D2688 – 11. . DOI: 10.1520/D2688-11. 10.1520/D2688-15.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D2688 − 15
5. Composition of Specimens
5.1 The specimens shall be similar in composition to the piping in the system in which the corrosion test is being made.
6. Effect of Cold Working on
...