Electrodeposition of Tin-Zinc alloys from gluconate Baths:Studies on Tin-Zinc Alloy Platings (Part 1)
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Tin-zinc alloys of low zinc content are believed to have high corrosion resistance when they are used for protective films on steel surface. This paper describes the following studies: an optimum composition for protective films was selected by electrochemical measurements of the cast alloys; and, zincate-stannate baths and gluconate baths were investigated to obtain such alloy deposits from baths free from cyanides and fluorides. The following results were obtained: (1) The static potential of tinzinc alloys was base enough to act as a sacrificial film for steel, and the potential of an alloy containin more than about 10% of zinc showed almost the same value as that of single zinc. (2) The anodic dissolution in NaCl solution and the formation of white precipitate on the alloy surface in a salt spray test more readily occurred with the increase in zinc content of the alloy. (3) It was difficult to obtain alloy deposits of lower zinc content from zincate-stannate baths under normal plating conditions. (4) A semi-bright zinc alloy deposit of lower zinc content was obtained from the bath containing 0.25mol/l of metal and 0.50mol/l of Na-gluconate with an additive such as 0.25mol/l of triethanolamine, 2.5-5g/l of polyethyleneglycolnonylphenylether (PEGNPE), 0.2-1g/l of peptone, and 0.04-0.06g/l of o-vanillin at pH=5. It was observed that a deposit of fine luster was apt to be obtained at a composition of nearly equi-molecular ratio between tin and zinc. (5) It was further observed that a deposit of highest zinc content was obtained from gluconate baths containing 20 and 35% of zinc at pH=5, and the zinc content of deposit was almost equal to that of the bath when the plating was conducted at a current density of 1-2Amp/dm2.
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