ASTM-A967 Historical Revision Information
Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts

ASTM-A967 - 2005(E1) EDITION - SUPERSEDED
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This specification covers several different types of chemical passivation treatments for stainless steel parts. The treatments are the following: immersion treatment using nitric acid solutions, immersion treatment using citric acid solution, and electrochemical treatment. Immediately after the removal from the passivating solution, the parts shall be thoroughly rinsed, using stagnant, countercurrent, or spray washes, singly or in combination, with or without a separate chemical treatment for neutralization of the passivation media. The chemical reactions of the passivating media on the surface of the stainless steel shall be stopped by rinsing of the stainless steel part, with or without a separate neutralization treatment. A chemical treatment shall be applied which will accelerate the formation of the passive film on a chemically clean stainless steel surface. The passivated parts shall exhibit a chemically clean surface and shall, on visual inspection, show no etching, pitting, or frosting. The following tests shall be performed on each lot of stainless steel parts: water immersion test, high humidity test, salt spray test, copper sulfate test, and potassium ferricyanide-nitric acid test. A free iron test shall be used for the detection of free iron on the surface of stainless steel.

ORDER

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 A 380.

1.3 Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1 gives some nonmandatory information and provides some general guidelines regarding the selection of passivation treatment appropriate to particular grades of stainless steel. It 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 intended to confirm the effectiveness of passivation, particularly with regard to the removal of free 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, and

1.4.6 Practice F - Free Iron Test.

1.5 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only.

The following precautionary caveat pertains only to the test method portions, Sections 14 through 18 of this specification: 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.

Notes

Claudia's Notes:
Changes to the new 2013 Edition of A967/A967M can be found in the following areas:  Section 1.5 (changed to combined Metric/US units), Revised Section 4.1 and added Section 4.3, Added Notes 2 and 3 to Sections 6 and 7, Revised Section 13.3, Combined Sections 14 through 19 into a new Section 14, Revised Section 22.1 (Now numbered 17.1) and added Section 17.2, and Added Sections X1.3.2-X1.3.4 and X1.12 to the Appendix.

This practice references QQ-P-35 (later renumbered AMS-QQ-P-35 and then withdrawn in favor of AMS-2700), another major passivation document.  The ASTM A967/A967-13 replaces ASTM A967/A967M-05 which is now obsolete.

Keywords

cleaning of stainless steel; descaling; passivation; tests for cleanliness of stainless steels; ICS Number Code 77.140.20 (Steels of high quality)

To find similar documents by ASTM Volume:

01.03 (Steel--Plate, Sheet, Strip, Wire; Stainless Steel Bar)

To find similar documents by classification:

77.140.20 (Stainless steels Including alloyed steels, corrosion-resistant steels, heat-resisting steels, etc.)

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Document Number

ASTM-A967-05e1

Revision Level

2005(E1) EDITION

Status

Superseded

Modification Type

Editorially changed

Publication Date

July 1, 2007

Document Type

Specification

Page Count

7 pages

Committee Number

A01.14