Mechanism Of Stains Produced On The Strip Surface Of High-speed Electrolytic Tin Line

Tinplate is mainly used for packaging materials. Because of its large use, its production and application technology development have attracted widespread attention in developed countries and there have been new developments. Fuluositan Law which has been used in an electrolytic tine line of one steel company, during the operation of electrolytic tin line, tin sludge is produced continuously in the surface of electrolyte and adhered to the sink stains defects are produced on the surface of strip. Then solution in electroplating bath is found to be polluted by oil periodically. It’s very easy to adhere to the strip surface, then cause stains defects on the surface of tinplate. At the same time, because oil can be dissolved in the electroplating bath solution, which will reduce the efficiency of electrolytic tinplat, then affect the quality of tinplate and increase cost of electrolytic tinplate.Based on study of electrolytic used in one tinplate line unit of one steel company, cross matching test has been done on the production velocity of sludge effected by all ingredients. Mechanism of sludge production and impact factors are clear and the main factors to affect sludge production are oxygen, electrolytic temperature and additive concentration. Sludge production has been controlled effectively through controlling blowing oxygen, reducing Fe2+concentration, reducing electrolytic temperature and improving PSA concentration. Cause and mechanism of electrolytic addtitive failure has been found through using High Performance Liquid Chromatography (HPLC), gas heating drum oxidation experiment, electrochemical stability analysis, It’s found that destruction of additives is the main reson of oil production which can be effectively controlled y improving EN concentration. Oil production frequency can be efficiently resolved by adjusting additive concentration and improving electrolytic recycling velocity. Then the stains on the surface of tinplate caused by these two reasons can be reduced by30%.