Test method for phosphate coatings
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United States of America Patent
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Aug 6, 1985
Grant Date -
N/A
app pub date -
Jun 20, 1984
filing date -
Jun 21, 1983
priority date (Note) -
Expired
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Abstract
A method for determining the coating weight and composition of a zinc phosphate coating on a ferrous metal surface comprises stripping the coating from a known area using an aqueous solution of sodium hydroxide and triethanolamine, thereafter measuring the iron and phosphate contents by colorimetric analysis of the stripping solution and then determining the coating weight and composition based on such measurements.
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