Cleaning and conversion coating of hot rolled steel articles
AssigneeTRN Business Trust
InventorRonald J. Zupancich
Life of this patent
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Abstract
A process is disclosed in which hot rolled steel articles, such as rail car articles, LP tanks and barge articles are cleaned and conversion coated. The cleaning compositions comprise aqueous phosphoric acid, and the conversion coating compositions comprise aqueous phosphate.
Claims61
A process for treating a rail car article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article with a solution comprising phosphoric acid,
- applying a post-cleaning rinse to the article,
- phosphate spraying the article with a solution comprising a phosphate, and
- applying a post-phosphating rinse to the article.
A process for treating a rail car article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article for 4-8 minutes with a solution comprising phosphoric acid,
- applying a post-cleaning rinse to the article,
- phosphate spraying the article for 1-6 minutes with a solution comprising a phosphate, and
- applying a post-phosphating rinse to the article.
A process for treating a rail car article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article for 4-8 minutes with a solution comprising phosphoric acid,
- applying a post-cleaning spray rinse to the article,
- phosphate spraying the article for 2-4 minutes with a solution comprising a phosphate,
- applying a post-phosphating spray rinse to the article, and
- drying and/or curing the article at 200-400° F.
A process for treating a rail car article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article for 4-8 minutes with a solution comprising phosphoric acid,
- applying a post-cleaning spray rinse to the article,
- phosphate spraying the article for 2-4 minutes with a solution comprising a phosphate, and
- applying a post-phosphating spray rinse to the article.
A process for treating an article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article for 1-8 minutes with a solution comprising phosphoric acid,
- applying a post-cleaning rinse to the article, phosphate spraying the article with a solution comprising a phosphate, and
- applying a post-phosphating rinse to the article.
A process for treating an LP tank article comprising hot rolled steel, wherein the process comprises:
- acid spray cleaning the article for 4-8 minutes with a solution comprising phosphoric acid,
- applying a post-cleaning spray rinse to the article,
- phosphate spraying the article for 2-4 minutes with a solution comprising a phosphate,
- applying a post-phosphating spray rinse to the article, and
- drying and/or curing the article at 300-600° F.
Dependencies are inferred from the claim text.