Process of producing phosphate coatings
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
Dec 13, 1993
filing date -
Dec 19, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process of producing a phosphate coating on a metal surface of iron or steel by contacting the surface with an aqueous phosphating solution on the basis of magnesium phosphate. The solution contains 0.2 to 4 g/l magnesium, 1 to 20 g/l phosphate (calculated as P.sub.2 O.sub.5) and a peroxide compound as an accelerator. The phosphating solution is free of inorganic substances which are not precipitable with calcium hydroxide in a neutral or alkaline medium. It is preferred to use phosphating solutions which also contain activators, which are precipitable with calcium hydroxide in a neutral or alkaline medium.
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