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US 2003/0079997 A1Published application
Method for coating metal surfaces
AssigneeEnthone Inc.
InventorWolf-Dieter Franz
Life of this patent
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Abstract
A method for coating a light metal alloy component to form a protective layer comprising Sn. First, a surface of the light metal alloy component is cleaned and passivated. A layer comprising Zn is formed on the surface, and a layer comprising Sn is deposited. An intermediate layer is preferably deposited between the Zn-containing layer and the Sn containing layer. The Sn-containing layer may additionally be varnished.
Claims59
A method for coating a metallic surface comprising:
- cleaning and passivating a surface of a light metal alloy component;
- forming a first layer on the cleaned and passivated surface wherein the first layer comprises Zn;
- and
- forming a second layer which comprises Sn such that the first layer is located between the surface of the light metal alloy component and the second layer.
1 more element
A method for coating a metallic surface comprising:
- alkaline degreasing the surface of a light metal alloy component, wherein the light metal alloy component has a Mg composition of at least about 50 weight %;
- performing an acid treatment of the surface to oxidatively produce a passivation layer on the surface, the acid treatment comprising:
- contacting the surface of the light metal alloy component with a weak acidic solution having a pH of from about 3 to about 5;
- and
- contacting the surface with a strong acidic solution which has a pH of from about 0.5 to about 2 which comprises fluoride ions;
- forming a first layer on the cleaned and passivated surface wherein the first layer comprises Zn;
- and
- forming a second layer which comprises Sn such that the first layer is located between the surface of the light metal alloy component and the second layer.
5 more elements
A method for coating a metallic surface comprising:
- contacting a surface of a light metal alloy component with an aqueous oxidation agent, wherein the light metal alloy component has an Al composition of at least about 60 weight %;
- forming a first layer on the surface wherein the first layer comprises Zn;
- and
- forming a second layer which comprises Sn such that the first layer is located between the surface of the light metal alloy component and the second layer.
1 more element
A coating for a light metal alloy comprising:
- a first layer comprising Zn wherein the first layer is deposited on a surface of the light metal alloy component;
- and
- a second layer comprising Sn,
- wherein the first layer is located between the surface of the light metal alloy component and the second layer.
1 more element
Dependencies are inferred from the claim text.