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Aluminum treatment composition

A technology of composition and fluorine compound, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as unable to provide substrate normally, sensitive to corrosion, etc.

Inactive Publication Date: 2011-08-03
MACDERMID INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, alloys of these metals are particularly sensitive to corrosion
Additionally, these materials have considerable problems with paint adhesion, as the resulting metal surfaces are often very smooth, prone to the formation of weakly bonded surface oxides, which do not normally provide a strong base for subsequent application of paint to hold on to themselves. fix

Method used

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Embodiment Construction

[0019] In one embodiment, the present invention generally relates to acidic aqueous conversion coatings for the pretreatment of metals, such as aluminum and aluminum alloys, zinc, zinc alloys, magnesium and magnesium alloys, and steel, and a method for A method of improving the corrosion resistance properties of such metal substrates.

[0020] In one embodiment, the present invention generally relates to compositions for pretreating aluminum and aluminum alloy substrates, and methods for pretreating aluminum and aluminum alloy substrates at temperatures ranging from ambient to about 200°F. method. These pretreatment compositions generally comprise an acidic aqueous solution having a pH in the range of about 0.5 to about 6, preferably about 3-5.

[0021] The pretreatment composition of the present invention is an aqueous solution, which generally comprises:

[0022] a) source of aluminum ions;

[0023] b) fluorine compounds;

[0024] c) at least one pH regulator;

[0025] ...

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Abstract

An aqueous conversion coating composition for treating metal substrates such as aluminum, aluminum alloys, zinc, zinc alloys, magnesium, magnesium alloys and steel to provide a conversion coating thereon. The conversion coating composition comprises a) a source of aluminum ions; b) a fluoro compound; c) at least one pH adjuster; d) a source of Group VIB metal ions selected from the group consisting of tungstate ions and trivalent chromium ions; and e) optionally, a preservative. The conversion coating composition provides a corrosion resistant coating on the metal surface and improves the adhesion of subsequently applied layers.

Description

technical field [0001] The present invention relates generally to compositions and methods for forming protective, corrosion-resistant coatings on metals or other materials coated with metals. Background technique [0002] Metals such as aluminium, zinc, magnesium, titanium, cadmium, silver, copper, tin, lead, cobalt, zirconium, beryllium or indium, their alloys and articles coated with these metals, in the presence of water They are prone to rapid corrosion because of their low redox potential or their tendency to form oxides. Unalloyed specimens of these metals usually form a native oxide film that protects them somewhat and reduces their overall corrosion rate. However, alloys of these metals are particularly sensitive to corrosive effects. Additionally, these materials have considerable problems with paint adhesion, as the resulting metal surfaces are often very smooth, prone to the formation of weakly bonded surface oxides, which do not normally provide a strong base ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/00C09D1/00
CPCC23C22/34C23C22/83C09D1/00C23C2222/10C09D5/103C23C22/44
Inventor R·鲍尔M·马利克
Owner MACDERMID INC
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