The rate of anodic solution of twelve metals and fifty-six alloys has been studied and tabulated. The electrolyte was a solution containing 15 to 20 per cent, by weight, of sulfuric acid. The rate of solution of a lead alloy containing 0.05 per cent of tellurium is only 1/10 that of commercial lead. Iron alloys containing 14 per cent of silicon, and iron alloys containing 25 per cent of titanium have respectively 1/20 and 1/10 the rate of corrosion of iron. It is believed the silicon forms an anode surface film which increases with time and current. This film is, however, very brittle. The anodic behavior of chromium steels and stainless steels, nickel alloys, carbides, high-speed steels, and others, has also been investigated. INTRODUCTION.
A group of amines was studied to determine their effect as addition agents in the electrodeposition of zinc. Amines of low number of carbon alkyl radicals showed a tendency toward good addition agent properties. The nitrogen in the amine in terms of grams N2 per liter of electrolyte must be controlled so as to obtain the most beneficial effects of the addition agent. The length of the organic radical attached to the amine was found to have a decided influence. Other factors such as wetting properly and compound salt formation were studied and compared with the experimental data obtained with a few addition agents. These latter factors do not appear to be of the controlling type, such as the three factors above, for obtaining bright, ductile zinc deposits.
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