Sets out the hydrogen evolution method for the determination of the average mass per unit area, or thickness, of zinc coatings on steel. The test requires the use of apparatus to measure the volume of hydrogen liberated resulting from the dissolution of the coating.

This Standard sets out the hydrogen evolution method for the determination of the average mass per unit area, or thickness, of zinc coatings on steel.The method is suitable for the testing of items which have a surface area that can be calculated to within an accuracy of 1%. The method is normally accurate to within 5%.NOTES: 1 A specialized version of this Method and apparatus for testing zinc coatings on wire is described in AS/NZS 4534.2 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.

First published as part of AS K173.1-1971 and AS K173.2-1971.Revised and redesignated in part as AS 2331.2.3-1980.Second edition 2001.Reconfirmed 2017. Originated as part of AS K173.1-1971 and AS K173.2-1971. Previous edition AS 2331.2.3-1980. Second edition 2001.