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Testing for the type of chromate coatings most often applied in the galvanizing industry is included in Section 6. To test for a chromate coating on a galvanized coating, simply place one drop of lead acetate testing solution on the surface and wait five seconds. Directions for preparing the lead acetate testing solution are included in Section 6. Remove the remaining testing solution by gently blotting it and ensuring not to disturb the deposit that may have formed under the liquid.
If a dark or black deposit or stain has developed, there is no chromate on the galvanized coating in that area. To verify test results, the lead acetate testing solution can be applied to a galvanized coating that was known not to have chromates applied to its surface.
This test involves placing drops of a lead acetate solution on the surface of the product, waiting 5 seconds, and then blotting it gently. If this solution creates a dark deposit or black stain, then there is unpassivated zinc present. A clear result indicates the presence of a chromate passivation coating. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use. Was this answer helpful? Are you still looking for the right answer? Ask an Expert.
Post Comment. Login Close. October 20, Authored by Bernardo A. Duran III. Is there an easy way to test for chromates on hot-dip galvanized steel? Leave this field blank.
ASTM B201 - 80(2019)
ASTM B A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. 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. Referenced Documents 2.
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