ASTM-B556 › Standard Guide for Measurement of Thin Chromium Coatings by Spot Test
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Scope
1.1 This guide covers the use of the spot test for the measurement of thicknesses of electrodeposited chromium coatings over nickel and stainless steel with an accuracy of about ±20 % (Section 9). It is applicable to thicknesses up to 1.2 μm.
Note 1—Although this test can be used for coating thicknesses up to 1.2 μm, there is evidence that the results obtained by this method are high at thicknesses greater than 0.5 μm. In addition, for coating thicknesses above 0.5 μm, it is advisable to use a double drop of acid to prevent depletion of the test solution before completion of the test.
1.2 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.
Keywords
chromium-coatings; coating thickness; nickel-electrodeposition; spot test; stainless steel; steel products-electrodeposited coatings; ICS Number Code 25.220.40 (Metallic coatings)
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02.05 (Metallic and Inorganic Coatings; Metal Powders and Metal Powder Products)
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Document Number
ASTM-B0556-90R23
Revision Level
1990 R23 EDITION
Status
Current
Modification Type
Reapproval
Publication Date
Nov. 7, 2023
Document Type
Guide
Page Count
3 pages
Committee Number
B08.10