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A — 05 Standard Speci? A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. It includes several alternative tests, with acceptance criteria, for con?
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 s967 no recommendations regarding the suitability of any grade, treatment, or acceptance criteria for any particular application or class of applications. These tests include the following practices: The SI units given in parentheses are for information only.
This standard does not purport to address all 9a67 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.
The presence of exogenous surface contamination, including dirt, grease, free iron from contact with steel tooling, and so forth, may interfere with the formation of the passive? The cleaning a697 these contaminants from the stainless steel surface will facilitate the spontaneous passivation by allowing the oxygen uniform access to the surface.
Current edition approved Sept. Originally approved in Last previous edition approved in as A — 01e1. Such treatments, also sometimes called passivation in common usage, are designated as post-cleaning treatments in this speci? The surface of stainless steel that has been pickled is free of scale, free iron, and exogenous foreign matter, and does not require a separate treatment for passivation as de? The passivation process de? The surface of stainless steel resulting from these treatments is free of scale, free iron, and exogenous foreign matter, and does not require a separate treatment for passivation as de?
Statements regarding chemical treatments, unless otherwise speci? Determination of the suitability of this speci? Materials and Preparation for Passivation Treatments 5. The effectiveness of a a96 treatment for a particular grade of stainless steel in a particular application is demonstrated by meeting the speci?
A9667 shall be given to maintaining adequate volume, concentration, purity, and temperature control appropriate to the size and amount of stainless steel to be treated. Such records shall be available for inspection when speci?
ASTM A967 Passivation Standard
The processor is not required to reveal the precise composition of proprietary chemical mixtures but shall maintain a unique identi? When electrochemical cleaning is required, it shall be performed in accordance with Practice B Treatments in Nitric Acid Solutions 6.
Treatments in Citric Acid 7. Immersion bath to be controlled at a pH of 1. Such treatments may include externally applying an electrical potential on the stainless steel parts, as in the case of electropolishing. The suitability of such passivation treatments for use in 3 meeting the requirements of this speci? NOTE 1—The selection of medium and procedures for a neutralization depends of the chemistry of the passivation and on economic considerations. An example of a medium that serves to accelerate the formation of the passive?
The parts shall then be thoroughly dried. Lot, Frequency of Testing, and Selection of Test Not all of the following tests are suitable for all grades of stainless steel. NOTE 2—Some of the tests may produce positive indications not associated with the presence of free iron on the stainless steel surface.
An example would be application of Practice C on some lesser-alloyed martensitic or ferritic stainless steels. Practice D—Copper Sulfate Test This test shall not be applied to parts to be used in food processing. At the end of this period, the surface shall be carefully rinsed and dried with care taken not to disturb copper deposits if present. It is recommended for detection of free iron on austenitic and series stainless steels. This test is not recommended for detection of free iron on ferritic or martensitic series stainless steels, because these steels will give a positive indication irrespective of the presence or absence of anodic surface contaminants.
ASTM A – 05 Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
The test solution shall be mixed fresh on the day of the test. The formation of a dark blue color within 30 s denotes the presence of metallic iron.
Practice A—Water Immersion Test This cycle shall be repeated a minimum of twelve times. Practice B—High Humidity Test Practice C—Salt Spray Test Practice F—Free Iron Test It is especially useful for large parts that have been uniformly cleaned but that are inconvenient for reasons of size of equipment or ease of handling of the part to place in the environments astn The cloth shall be in contact with the steel for an area of at least 20 square inches cm2.
The pad shall be maintained wet through the test period, either by a method of retarding external evaporation, by the further addition of potable water, or by backing the pad with a sponge or similar water source.
The cloth pad used shall be used for only one such test, being changed for each test so as to avoid risk of contamination.
After removal of the cloth pad, the surface of the part shall be allowed to dry in air before inspection. Rejection and Retest A rejected lot may, at the option of the processor, be re-passivated, with or without re-pretreatment, and then be retested.
The number of samples tested from a lot subject to retest shall be twice the original speci? All samples must pass the speci? Precision and A9967 Minor changes have been made in astk text to facilitate references to the main document a67 to correct technical inaccuracies. These particles must be removed or they will appear as rust or stain spots. This condition may be prevented by chemically treating the parts to remove the iron particles or other foreign particles, and then allowing the passive?
Rinsing can be accomplished by a combination of stagnant, countercurrent or spray rinses, or both, prior to? QQ-PC, but also includes a number of alternative passivation treatments.
The effectiveness of any passivation treatment is demonstrated by satm parts meeting the speci? Cleaning by mechanical methods or other chemical methods is recommended.
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