Methods of and compositions for preventing corrosion of metal substrates
AssigneeBrent International PLC
InventorJohn C. Affinito
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Abstract
A method for protecting a metal substrate from corrosion comprises the steps of providing a metal substrate and applying a treatment solution to the surface of the metal substrate, wherein the treatment solution comprises a partially hydrolyzed aminosilane and a fluorine-containing inorganic compound. Preferably the metal substrate is selected from the group consisting of aluminum, aluminum alloys and mixtures thereof.
Claims23
A method for coating a metal substrate, comprising the steps of:
- (a) providing a metal substrate;
- and
- (b) contacting the metal substrate with the treatment solution for a period of time of from about 2 seconds to about 5 minutes,
- wherein the treatment solution is free of silane crosslinkers and comprises a partially hydrolyzed aminosilane and a fluorine-containing inorganic compound, and the coating provided by the treatment solution is present on the metal substrate at a weight of from about 10 mg/sq. ft. to about 14 mg/sq. ft.
A method for protecting a metal substrate from corrosion, comprising the steps of:
- (a) providing a metal substrate selected from the group consisting of aluminum, aluminum alloys and mixtures thereof;
- (b) cleaning the metal substrate;
- (c) applying to the surface of the metal substrate a treatment solution comprising a partially hydrolyzed aminosilane and a fluorine-containing inorganic compound to form a conversion coating;
- and
- (d) drying the metal substrate at a temperature of from 60° F. to about 180° F.;
- wherein the treatment solution is free of silane crosslinkers, and further wherein after the step of drying the metal substrate the conversion coating provided by the treatment solution is present on the metal substrate at a weight of from about 10 mg/sq. ft. to about 14 mg/sq. ft.
A treatment solution consisting essentially of:
- water;
- from about 0.18% by weight to about 3% by weight of an aminosilane;
- and
- from about 0.05% by weight to about 1.2% by weight of a fluorine-containing inorganic compound;
- and
- wherein the aminosilane is partially hydrolyzed.
A method for treating a metal substrate prior to applying a polymer coating, comprising the steps of:
- (a) providing a metal substrate selected from the group consisting of aluminum, aluminum alloys and mixtures thereof;
- (b) contacting the metal substrate with a treatment solution for a period of time of from about 2 seconds to about 5 minutes;
- (c) drying the metal substrate at a temperature of from 60° F. to about 180° F.;
- and
- (d) applying a polymer coating;
- wherein the treatment solution comprises water and from about 0.18% by weight to about 3% by weight aminosilane and from about 0.05% by weight to about 1.2% by weight of fluorine-containing inorganic compound, and further wherein after the step of drying the metal substrate the coating provided by the treatment solution is present on the metal substrate at a weight of from about 10 mg/sq. ft. to about 14 mg/sq. ft.
Dependencies are inferred from the claim text.