The ASTM B504-90 (2023) standard specifies a method for measuring the thickness of metallic coatings using Coulometry, which is suitable for very small test areas. Coulometry measures the thickness of coatings by destroying them, mainly for bare spots or situations where they may be damaged in the test area. This method is not suitable for high-precision application scenarios. Destructiveness of coatings should be considered when using it.
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