Pretreatment of metal sheets which are coated after a forming operation |
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| 申请号 | US3696498D | 申请日 | 1970-12-03 | 公开(公告)号 | US3696498A | 公开(公告)日 | 1972-10-10 |
| 申请人 | BAYER AG; | 发明人 | LEONTARITIS LAMBIS; SCHON NIKOLAUS; HOFFMANN HANS; SAYED AZIZ EL; | ||||
| 摘要 | This invention relates to an improved process for the pretreatment of metallic materials wherein the material is subjected to a surface treatment, subsequently covered with a removable layer of a water soluble, film-forming organic polymer, formed and provided with a firmly adhering protective layer. | ||||||
| 权利要求 | 2. A process as claimed in claim 1, wherein the metallic material is steel. 3. A process as claimed in claim 1, wherein the firmly adhering protective layer is a layer of enamel. 4. A process as claimed in claim 1, wherein the shaping operation is a non-machining shaping operation. 5. A process as claimed in claim 1, wherein the water-soluble film forming organic polymer is a member selected from the group consisting of polyethylene oxide, polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose and mixtures thereof. 6. A process as claimed in claim 5, wherein the polymer is applied to the metallic material from dilute aqueous solution, the water being removed to leave a solid film, and the film being removed by water after shaping. 7. A process as claimed in claim 6, wherein the metallic material is a steel sheet which is shaped in a press, the film being removed with water and the sheet thereafter being enamelled. |
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| 说明书全文 | |||||||
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