Corrosion prevention method of high-tension steel

Abstract

Abstract PURPOSE: To perform corrosion prevention superior in resistance to corrosion and hydrogen brittleness, by chelating the plating bath including specific quantities of stannous and zinc ions at the equimolecular ratio and by adding specific quantities of polyoxyethylene-nonyl-phenyl-ether and palladium ions to perform electrolytic plating and by performing the baking processing. CONSTITUTION: 2 Equivalents of sodium gluconate and 1 equivalent of triethanolamin are added to the plating bath, which includes stannous and zinc ions at the equimolecular ratio and has total ion concentration 0.2W0.3mol/l, to chelate this plating bath, and pH 5W8 is obtained. Further, 0.02W0.1g/l polyoxyethylene-nonyl- phenyl-ether and 2W40ppm palladium ions are added as additives. The tin-zinc alloy is used as the anode to perform electrolytic plating in this bath, and the baking processing is performed at 150W200°C for two or more hours after the tin-zinc- palladium alloy is electrodeposited. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Koji Takada

Bibliographic Details