Specifes a method, based on anode dissolution, for measuring the thickness of metallic coatings. An Appendix lists typical electrolytes which can be used for measuring the thickness of various coating types on common metal substrates.

This Standard specifies a coulometric method based on anodic dissolution for measuring the thickness of metallic coatings.Typical combinations of coatings and substrates that can be tested by this method are given in Table 1. Other combinations may be tested with electrolytes in current use, or with new electrolytes developed for them; in both cases, it is necessary to verify the suitability of the complete system.The method is also applicable to multi-layer systems, for example Cu/Ni/Cr (see Clause 7.6).This method may be used to measure the thickness of coatings applied by various means, if due account is taken of special features, such as the presence of an alloy layer. In some cases, the thickness of diffusion layers can also be measured. The method can also be used to measure the thickness of coatings on cylindrical specimens and wires (see Clause 7.8).NOTES: 1 The test procedures described in this Standard do not necessarily include all of the precautions required to satisfy health and safety aspects. Care should be taken to ensure that the procedures are carried out only by people who have received suitable training. Guidance in the handling and use of hazardous chemicals is given in AS/NZS 2243.1 and AS/NZS 2243.2.2 Factors relating to measuring accuracy are given in Appendix A.

First published as part of AS K173.2-1971.Revised as redesignated in part as AS 2331.1.2-1980.Second edition 2001.Reconfirmed 2017. First published as part of AS K173.2-1971. Revised as redesignated in part as AS 2331.1.2-1980. Second edition 2001.