Chromium-free rust inhibitive treatment method for metal products having zinc surface and metal products treated thereby
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United States of America Patent
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Issued Date -
Jul 27, 2006
app pub date -
Jan 19, 2006
filing date -
Jan 24, 2005
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Abandoned
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Abstract
Provided is a chromium-free surface treatment method which imparts practical rust inhibitive performance to a metal product having a zinc surface to which it was difficult to impart rust inhibitive performance of practical level. A conversion-coated film of zinc phosphate etc. is formed on the zinc surface of the metal product as pretreatment, and the silica-based film is formed by applying a chromium-free surface treatment agent which uses alcohol or mixture of water and alcohol as a solvent to the conversion-coated film. As a result, when an aqueous surface treatment agent containing alcohol is applied, it is possible to suppress the formation of white rusting for 72 hours or longer in the salt spray test.
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