Title:
【発明の名称】燃料タンク用表面処理鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP3418177
Kind Code:
B2
Abstract:
A surface-treated sheet for fuel tanks includes a cold-rolled steel sheet with a low carbon content, a zinc or zinc-based alloy plating layer formed on the steel sheet, and a chromate film coated on the zinc or zinc-based alloy plating layer. The chromate film is formed from a chromate solution. The chromate solution includes a subject solution and an aqueous silane solution in an amount ranging from 5 to 50% by weight of the subject solution. The subject solution contains a chrome aqueous solution where the concentration of chrome is in the range of 5-50 g/l and the ratio of trivalent chrome to the chrome content is in the range of 0.4 to 0.8. Phosphoric acid in an amount ranging from 20 to 150% by weight with respect to the chrome content, fluoric acid in an amount ranging from 10 to 100% by weight with respect to the chrome content, colloidal silica having pH of 2-5 in an amount ranging from 50 to 2000% by weight with respect to the chrome content, and sulfuric acid in an amount ranging from 5 to 30% by weight with respect to the chrome content are mixed with the chrome aqueous solution. The aqueous silane solution contains 2-10 wt % of Epoxy-based silane and has a pH of 2-3. A resin coating layer is formed on one side or both sides of the chromate film. The resin coating layer is formed from a resin solution. The resin solution includes a phenoxy resin solution having a molecular weight of 25,000-50,000, colloidal silica of 10-20 phr with respect to the phenoxy resin content, and melamine resin of 2-15 phr with respect to the phenoxy resin content.
Inventors:
Lee Jae-Lun
Northan-Geor
Cho Su-Hyoun
Song Young-Kyun
Chan Sam-Kyu
Northan-Geor
Cho Su-Hyoun
Song Young-Kyun
Chan Sam-Kyu
Application Number:
JP2000585472A
Publication Date:
June 16, 2003
Filing Date:
November 30, 1999
Export Citation:
Assignee:
Pohang Iron and Steel Company Limited
International Classes:
B05D7/14; B05D1/28; B32B15/04; B32B15/08; C09D123/04; C09D123/10; C09D127/12; C09D161/28; C09D163/00; C09D171/10; C09D183/00; C09D191/06; C23C22/26; C23C22/27; C23C22/28; C23C22/30; C23C22/32; C23C22/37; C23C28/00; C23C30/00; (IPC1-7): C23C28/00
Domestic Patent References:
| JP6283478A | ||||
| JP9157864A | ||||
| JP6173025A | ||||
| JP565676A | ||||
| JP4197473A | ||||
| JP42783A |
Attorney, Agent or Firm:
Hiroshi Arafune (1 person outside)