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The electrochemical and corrosion behavior of Types 304 and 316 stainless steels and Carpenter 20 Cb-3 alloy in 99 percent sulfuric acid solutions have been investigated at temperatures up to 127°C. The open-circuit potentials (OCP) have been monitored against immersion time. Oscillations of the OCP at high temperature were observed in some cases. Correlation between OCP-time behavior and corrosion resistance has been established. Metallurgical studies have been carried out for alloys after each test. Changes in the corrosion behavior on the alloy surfaces as a function of temperature and solution concentration were observed.
The corrosion rate of each alloy/medium system has been determined by the conventional weight-loss measurement. Comparison of the corrosion resistance among three alloys has also been made. Corrosion rate was found to increase with increasing temperature, stirring rate, and iron content in the solution.
corrosion, electrochemistry, anodic polarization, stainless steels
Staff metallurgist, Allied Chemical Corporation, Morristown, N.J.