Method for producing tinned steel sheet, tinned steel sheet,...

Details Method for producing tinned steel sheet, tinned steel sheet,... Method for producing tinned steel sheet, tinned steel sheet,...

C - Chemistry, Metallurgy

23

C

C23C 22/20 (2006.01) C23C 28/00 (2006.01) C25D 5/26 (2006.01) C25D 5/50 (2006.01) C25D 11/36 (2006.01)

Patent

CA 2721979

A chemical conversion treatment fluid which contains aluminum primary phosphate in an amount exceeding 18g/L and up to 200g/L and has a pH of 1.5 to 2.4; and a process for the production of tin-plated steel sheets which comprises forming an Sn-containing plating layer on at least one side of a steel sheet in a coating weight of 0.05 to 20g/m2 per side, subjecting the plated steel sheet either to dipping in the chemical conversion treatment fluid or to cathodic electrolysis in the chemical conver-sion treatment fluid at a current density of 10A/dm2 or below, and then drying the resulting steel sheet to form a chemical conver-sion coating. The process involving the use of the treatment fluid can give, through low-cost chemical conversion treatment and even without using Cr causative of environmental problems, a tin-plated steel sheet wherein the surface appearance or the close adhesion of a coating is inhibited from being deteriorated by surface oxidation of the tin plating layer.

????????1??????????18g/L?200g/L?????pH?1.5~2.4????????????????????????????????Sn??????????0.05~20g/m2??????Sn??????????????????????????????????????????????10A/dm2???????????????????????????????????????????????????????????????Cr???????????????????????????????????????????????????????????????????

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