Process for treating steel-, zinc- and aluminum-based metals using a two-step coating system
AssigneeHenkel Corporation
InventorsShawn E. Dolan, Michael J. Kay, Lawrence R. Carlson
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Abstract
The present invention comprises a method for treating one or more multi-metal articles. The method comprises exposing the one or more articles to a first treatment composition capable of providing a conversion coating on steel- and zinc-based metal, and exposing the one or more articles to a second treatment coating composition suitable for providing a conversion coating on aluminum-based metal articles. Preferably, the first treatment composition comprises a zinc-phosphate conversion coating comprising, zinc ion, phosphate ion, manganese ion, and fluoride ion. Preferably, the second treatment composition comprises a ceramic composite treatment composition.
Claims26
A method for sequentially treating one or more (multi-metal articles, said method comprising:
- exposing the one or more of the multi-metal articles to a phosphating composition capable of providing a conversion coating on steel- and zinc-based metals;
- and
- exposing the one or more articles to a ceramic composite treatment composition capable of providing a conversion coating on aluminum-based metal, the ceramic composite treatment composition comprising:
- (A) an aqueous composition comprising the product of chemical interaction between:
- (1) a first reagent component selected from the group consisting of fluoroacids of the elements of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the first reagent component being dissolved in water;
- and
- (2) a second reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the second regent component dissolved, dispersed or both dissolved and dispersed in water.
A method for sequentially treating one or more multi-metal articles, said method comprising:
- exposing the one or more of the multi-metal articles to a phosphating composition capable of providing a conversion coating on steel- and zinc-based metals;
- and
- exposing the one or more articles to a ceramic composite treatment composition capable of providing a conversion coating on aluminum-based metal, the ceramic composite treatment composition comprising:
- (A) an aqueous composition comprising the product of chemical interaction between:
- (1) a first reagent component selected from the group consisting of fluoroacids of the elements of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the first reagent component being dissolved in water;
- and (2) a second reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the second regent component dissolved, dispersed or both dissolved and dispersed in water, wherein an amount corresponding to a total concentration of at least about 0.15 M of H2TiF6, and H2ZrF6 is reacted to make component (A) of the ceramic composite treatment composition, and an amount of silica that corresponds to a number of moles of silica such that the ratio of the number of moles of fluoroacids to the number of moles of silica that are reacted to make component (A) is within a range from about 1.6:1.0 to 5.0:1.0.
A method for sequentially treating one or more multi-metal articles, said method comprising:
- exposing the one or more of the multi-metal articles to a phosphating composition capable of providing a conversion coating on steel- and zinc-based metals;
- and
- exposing the one or more articles to a ceramic composite treatment composition capable of providing a conversion coating on aluminum-based metal, the ceramic composite treatment composition comprising:
- (A) an aqueous composition comprising the product of chemical interaction between:
- (1) a first reagent component selected from the group consisting of fluoroacids of the elements of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the first reagent component being dissolved in water;
- and
- (2) a second reagent component selected from the group consisting of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, tin and all of oxides, hydroxides, and carbonates of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin, the second regent component dissolved, dispersed or both dissolved and dispersed in water, wherein after the one or more articles ceases being exposed to the ceramic composite treatment composition, the one or more articles undergoes no further coating, washing, or heated drying for a period of 15-240 seconds.
An article comprising a first portion that is made of steel-, and/or zinc-based metal, and a second portion that is made of aluminum-based metal, wherein the first portion of the article is coated with a first phosphate layer adhering to and overlying the first portion of the article, and a ceramic composite layer adhering to and overlying both the phosphate layer and the second portion of the article.
Dependencies are inferred from the claim text.