ASTM International - ASTM B556-90(2012)
Standard Guide for Measurement of Thin Chromium Coatings by Spot Test
| Organization: | ASTM International |
| Publication Date: | 1 May 2012 |
| Status: | inactive |
| Page Count: | 3 |
| ICS Code (Metallic coatings): | 25.220.40 |
significance And Use:
4.1 The thickness of a decorative chromium coating is often critical to its performance.
4.2 This procedure is useful for an approximate determination when the best possible accuracy is not... View More
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.2
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.3 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
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