ASTM B895-15
(Test Method)Standard Test Methods for Evaluating the Corrosion Resistance of Stainless Steel Powder Metallurgy (PM) Parts/Specimens by Immersion in a Sodium Chloride Solution
Standard Test Methods for Evaluating the Corrosion Resistance of Stainless Steel Powder Metallurgy (PM) Parts/Specimens by Immersion in a Sodium Chloride Solution
SIGNIFICANCE AND USE
5.1 The ability of sintered powder metallurgy stainless steel parts/specimens to resist corrosion when immersed in sodium chloride solution is important to their end use. Causes of unacceptable corrosion may be incorrect alloy, contamination of the parts by iron or some other corrosion-promoting material or improper sintering of the parts (for example, undesirable carbide and nitride formations caused by poor lubricant burnoff or improper sintering atmosphere).
5.2 This standard may be part of a purchase agreement between the PM parts producer (seller) and the user of the parts (purchaser) (Method 1). It may also be used to optimize part or specimen production parameters (Method 2).
SCOPE
1.1 These test methods cover a procedure for evaluating the ability of sintered PM stainless steel parts/specimens to resist corrosion when immersed in a sodium chloride (NaCl) solution.
1.2 Corrosion resistance is evaluated by one of two methods. In Method 1, the stainless steel parts/specimens are examined periodically and the time to the first appearance of staining or rust is used to indicate the end point. In Method 2, continued exposure to the sodium chloride solution is used to monitor the extent of corrosion as a function of time.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address 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.
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Designation: B895 − 15
StandardTest Methods for
Evaluating the Corrosion Resistance of Stainless Steel
Powder Metallurgy (PM) Parts/Specimens by Immersion in a
1
Sodium Chloride Solution
This standard is issued under the fixed designation B895; 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* G1 Practice for Preparing, Cleaning, and Evaluating Corro-
sion Test Specimens
1.1 These test methods cover a procedure for evaluating the
G48 Test Methods for Pitting and Crevice Corrosion Resis-
ability of sintered PM stainless steel parts/specimens to resist
tance of Stainless Steels and Related Alloys by Use of
corrosion when immersed in a sodium chloride (NaCl) solu-
Ferric Chloride Solution
tion.
1.2 Corrosion resistance is evaluated by one of two meth-
3. Terminology
ods. In Method 1, the stainless steel parts/specimens are
3.1 Definitions—Useful definitions of terms for metal pow-
examined periodically and the time to the first appearance of
ders and powder metallurgy are found in Terminology B243.
staining or rust is used to indicate the end point. In Method 2,
continued exposure to the sodium chloride solution is used to
4. Summary of Test Method
monitor the extent of corrosion as a function of time.
4.1 Method 1 is recommended for evaluating the corrosion
1.3 The values stated in SI units are to be regarded as
resistance of stainless steel powder metallurgy parts/specimens
standard. No other units of measurement are included in this
and to verify that proper materials and processing conditions
standard.
were used.
1.4 This standard does not purport to address the safety
4.1.1 In this method, parts/specimens are immersed in 5 %
concerns, if any, associated with its use. It is the responsibility
(by mass) NaCl solution and examined periodically until the
of the user of this standard to establish appropriate safety and
first appearance of staining or rust. A part or specimen is
health practices and determine the applicability of regulatory
considered to have reached the end point when the first sign of
limitations prior to use.
corrosion occurs.
4.2 Method 2 is recommended for evaluating the processing
2. Referenced Documents
2 variables used in producing parts/specimens.
2.1 ASTM Standards:
4.2.1 In this method, parts/specimens are exposed further to
A380 Practice for Cleaning, Descaling, and Passivation of
the NaCL solution and periodically rated as either A, B, C, or
Stainless Steel Parts, Equipment, and Systems
D (A-no corrosion; D-high or extreme corrosion) by compari-
B243 Terminology of Powder Metallurgy
son with Fig. 1, a photograph of corroded specimens which
B528 Test Method for Transverse Rupture Strength of Pow-
serves as a standard. Additional examples of quantitative
der Metallurgy (PM) Specimens
ratings may be found inTest Method D610. Method 2 has been
D610 Practice for Evaluating Degree of Rusting on Painted
found useful in alloy screening and process optimization
Steel Surfaces
studies.
D1193 Specification for Reagent Water
5. Significance and Use
1
These test methods are under the jurisdiction of Committee B09 on Metal
5.1 The ability of sintered powder metallurgy stainless steel
Powders and Metal Powder Products and is the direct responsibility of Subcom-
parts/specimens to resist corrosion when immersed in sodium
mittee B09.05 on Structural Parts.
chloride solution is important to their end use. Causes of
Current edition approved Oct. 1, 2015. Published November 2015. Originally
ɛ1
unacceptable corrosion may be incorrect alloy, contamination
approved in 1999. Last previous edition approved in 2010 as B895 – 05(2010) .
DOI: 10.1520/B0895-15.
ofthepartsbyironorsomeothercorrosion-promotingmaterial
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
or improper sintering of the parts (for example, undesirable
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
carbideandnitrideformationscausedbypoorlubricantburnoff
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. or improper sintering atmosphere).
*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
1
---------------------- Page: 1 ----------------------
B895 − 15
FIG. 1 Examples of Ratings for Various Amounts of Rust or Stain (Immersion in Aqueous Solution of 5 % NaCl)
5.2 This standard may be part of a purchase agreement each test except for routine testing of production parts, where
betweenthePMpartsproducer(
...
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: B895 − 05 (Reapproved 2010) B895 − 15
Standard Test Methods for
Evaluating the Corrosion Resistance of Stainless Steel
Powder Metallurgy (PM) Parts/Specimens by Immersion in a
1
Sodium Chloride Solution
This standard is issued under the fixed designation B895; 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
ε NOTE—Updated abbreviation for powder metallurgy throughout editorially in June 2010.
1. Scope Scope*
1.1 These test methods cover a procedure for evaluating the ability of sintered PM stainless steel parts/specimens to resist
corrosion when immersed in a sodium chloride (NaCl) solution.
1.2 Corrosion resistance is evaluated by one of two methods. In Method 1, the stainless steel parts/specimens are examined
periodically and the time to the first appearance of staining or rust is used to indicate the end point. In Method 2, continued
exposure to the sodium chloride solution is used to monitor the extent of corrosion as a function of time.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address 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:
A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
B243 Terminology of Powder Metallurgy
B528 Test Method for Transverse Rupture Strength of Powder Metallurgy (PM) Specimens
D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
D1193 Specification for Reagent Water
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
G48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride
Solution
3. Terminology
3.1 Definitions—Useful definitions of terms for metal powders and powder metallurgy are found in Terminology B243.
4. Summary of Test Method
4.1 Method 1 is recommended for evaluating the corrosion resistance of stainless steel powder metallurgy parts/specimens and
to verify that proper materials and processing conditions were used.
4.1.1 In this method, parts/specimens are immersed in 5 % (by mass) NaCl solution and examined periodically until the first
appearance of staining or rust. A part or specimen is considered to have reached the end point when the first sign of corrosion
occurs.
4.2 Method 2 is recommended for evaluating the processing variables used in producing parts/specimens.
1
These test methods are under the jurisdiction of Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of Subcommittee B09.05
on Structural Parts.
Current edition approved May 1, 2010Oct. 1, 2015. Published June 2010November 2015. Originally approved in 1999. Last previous edition approved in 20052010 as
ɛ1
B895 – 05.B895 – 05(2010) . DOI: 10.1520/B0895-05R10E01.10.1520/B0895-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
1
---------------------- Page: 1 ----------------------
B895 − 15
4.2.1 In this method, parts/specimens are exposed further to the NaCL solution and periodically rated as either A, B, C, or D
(A-no corrosion; D-high or extreme corrosion) by comparison with Fig. 1, a photograph of corroded specimens which serves as
a standard. Additional examples of quantitative ratings may be found in Test Method D610. Method 2 has been found useful in
alloy screening and process optimization studies.
5. Significance and Use
5.1 The ability of sintered powder metallurgy stainless steel parts/specimens to resist corrosion when immersed in sodium
chloride solution is important to their end use. Causes of unacceptable corrosion may be incorrect alloy, contamination of the part
...
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