Abstract

The electrochemical behaviour of titaniummolybdenum alloys (10, 20,30 wt.%Mo) in boiling, deaerated 1 N H 2SO 4 was investigated. Attention was focused on the potential region of transpassive dissolution of molybdenum. Potentiostatic polarization curves in conjunction with Auger electron spectroscopy were used to correlate the current-potential relationship in this region with the composition of the oxide films. It was shown that at open-circuit potential, for Ti—20 and 30Mo an accumulation of molybdenum in the oxide film results in alloy passivity. However, in the region of the transpassivation with respect to the molybdenum, the presence of Mo in the oxide led to a higher dissolution rate than that exhibited by pure titanium. In the transpassivation region, the steady state currents increased with increasing potential up to a characteristic anodic potential. At potentials more positive than this point, the anodic currents declined. This decrease in current was correlated with a depletion of Mo from the outer layers of the oxide with the consequent formation of a more protective titaniumoxide film structure.

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