EVALUATION OF CORROSION-RESISTANCE OF TITANIUM-ALLOY WELDED-JOINTS BYPOLARIZATION RESISTANCE METHOD

Specimens that had been heat-treated in air or in vacuum at 1020-degre es-C were tested in 5% sulfuric acid at 50-degrees-C. The polarization resistance method is suitable for the evaluation and prediction of co rrosion resistance of titanium alloy welded joints. There is very litt le difference between values of the constant of the method B = 43+/-5. 7 mV for the base metal and for the zones of the welded joint. An equa tion is proposed for the influence of the corrosion potential differen ce on the efficiency of cathodic and anodic processes on the base meta l, the heat-affected area, and the welded seam itself. The Tafel slope is determined from the constant of the method B.