High temperature conversion coating on steel and iron substrates
AssigneeQuaker Chemical Corporation
InventorJames E. Murphy, III
Life of this patent
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Abstract
The present invention is directed to compositions and methods for forming conversion coatings on a surface of a substrate by contacting a liquid composition to the surface of the substrate at a high temperature (i.e., 400° F. or above).
Claims17
A method of forming a conversion coating on a ferriferous substrate, said method comprising contacting a surface of said ferriferous substrate with a liquid composition comprising a) 1.0-10.0% sodium phosphate ester and/or potassium phosphate ester, b) at least 0.1% of sodium hydroxide, potassium hydroxide, ammonium hydroxide, or a combination thereof, and c) at least 25% phosphoric acid, wherein said surface of said ferriferous substrate is at a temperature of least 400° F.
A method of forming a conversion coating on a ferriferous substrate, said method comprising contacting a surface of said ferriferous substrate with a liquid composition comprising a) 1.0-10.0% sodium phosphate ester and/or potassium phosphate ester, b) at least 0.1% of sodium hydroxide, potassium hydroxide, ammonium hydroxide, or a combination thereof, and c) at least 25% phosphoric acid, wherein said liquid composition is applied at a temperature of at least 400° F.
A method of forming a conversion coating on a substrate, said method comprising contacting a surface of said substrate with a liquid composition comprising a) 1.0-10.0% sodium phosphate ester and/or potassium phosphate ester, b) at least 0.1% of sodium hydroxide, potassium hydroxide, ammonium hydroxide, or a combination thereof, and c) at least 25% phosphoric acid, wherein said surface of said substrate is at a temperature of least 400° F.
A method of forming a conversion coating on a ferriferous substrate, said method comprising contacting a surface of said ferriferous substrate with a liquid composition comprising a) 1.0-10.0% sodium phosphate ester and/or potassium phosphate ester, b) at least 0.1% of sodium hydroxide, potassium hydroxide, ammonium hydroxide, or a combination thereof, and c) at least 25% phosphoric acid, wherein said surface of said ferriferous substrate is at a temperature of least 1700° F.
A method of forming a conversion coating on a ferriferous substrate, said method comprising contacting a surface of said ferriferous substrate with a liquid composition comprising a) 1.0-10.0% sodium phosphate ester and/or potassium phosphate ester, b) at least 0.1% of sodium hydroxide, potassium hydroxide, ammonium hydroxide, or a combination thereof, and c) at least 25% phosphoric acid, wherein said surface of said ferriferous substrate is at a temperature of least 1800° F.
Dependencies are inferred from the claim text.