Electric tin plating apparatus and method for producing tin plated steel sheet

摘要

PROBLEM TO BE SOLVED: To provide an electrotinning device capable of sufficiently reducing the generation amount of sludge in a plating liquid.SOLUTION: Provided is an electrotinning device 100 comprising: an electroplating tank 10 where tinning is applied to a steel sheet 11 passed through a space between insoluble electrodes 18, 18 arranged so as to be confronted using a plating liquid 55; a tin dissolution tank 35 where the plating liquid 55 obtained by dissolving filled metal tin 32 is fed to the electroplating tank 10 via a circulation tank 24; and a transportation part 30 where the plating liquid 55 is returned from the circulation tank 24 to the tin dissolution tank 35. The electrotinning device 100 includes: an oxygen feed part 40 of feeding an oxygen gas to the plating liquid 55 circulating through the transportation part 30; a measurement part 50 of measuring the oxygen concentration in the plating liquid 55 returning the tin dissolution tank 35 on the downstream side than the oxygen feed part 40; and a control part 60 of controlling the oxygen feed part 40 so as to control the feed amount of the oxygen gas in accordance with the measured value of the oxygen concentration.SELECTED DRAWING: Figure 1