Designation

This standard is issued under the fixed designation A967/A967M; 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 (ε) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the U.S. Department of Defense.

1. Scope*

1.1

This specification covers several different types of chemical passivation treatments for stainless steel parts. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. It includes several alternative tests, with acceptance criteria, for confirmation of effectiveness of such treatments for stainless steel parts.

1.2

Practices for the mechanical and chemical treatments of stainless steel surfaces are discussed more thoroughly in Practice A380/A380M.

1.3

Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1 and Appendix X2 give some nonmandatory information and provides some general guidelines regarding the selection of passivation treatments appropriate to particular grades of stainless steel. This specification makes no recommendations regarding the suitability of any grade, treatment, or acceptance criteria for any particular application or class of applications.

1.4

The tests in this specification are qualitative tests intended to confirm the effectiveness of passivation, particularly with regard to the removal of contaminant iron and other exogenous matter. These tests include the following practices:

1.4.1

Practice A—Water Immersion Test,

1.4.2

Practice B—High Humidity Test,

1.4.3

Practice C—Salt Spray Test,

1.4.4

Practice D—Copper Sulfate Test,

1.4.5

Practice E—Potassium Ferricyanide-Nitric Acid Test,

1.4.6

Practice F—Damp Cloth Test, and

1.4.7

Practice G—Boiling Water Immersion Test.

1.5

The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.6

This standard does not purport to address all of thesafety 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.

1.7

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

2.2

3. Terminology

3.1

3.2

4. Ordering Information

4.1

4.2

4.3

4.4

5. Materials and Preparation for Passivation Treatments

5.1

5.2

5.3

6. Treatments in Nitric Acid Solutions

6.1

6.2

7. Treatments in Citric Acid Solutions

7.1

7.2

8. Treatments in Other Chemical Solutions, Including Electrochemical Treatments

8.1

8.2

8.3

9. Rinsing and Neutralization

9.1

9.2

10. Post-Cleaning Treatments

10.1

10.2

10.3

11. Finish

11.1

12. Testing Agency

12.1

13. Lot, Frequency of Testing, and Selection of Test

13.1

13.2

13.3

14. Verification Tests

14.1

14.2

14.3

14.4

14.5

14.6

14.7

14.8

14.9

14.10

15. Rejection and Retest

15.1

16. Precision and Bias

16.1

17. Certification

17.1

17.2

18. Keywords

18.1

ASTM A967/A967M - 25

Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts

Current

Published:

1 Jan 2025