Abstract
To investigate the effect of SO42- ion on pitting corrosion behavior of aluminum and aluminum alloy brazing sheets immersion corrosion test and electrochemical measurements were carried out in the solution of lower chloride concentration containing SO42- ion. As the SO42- ion reduced the anodic and cathodic reaction rate, the pitting corrosion resistance of aluminum increased. The pitting corrosion occurred even in solution containing SO42- when the cathodic reaction was high enough. In that case the pitting corrosion rate was much higher than that in the SO42- ion free solution. Higher pitting corrosion rate induced by SO42- ion was due to the lower pitting corrosion density which was closely related with the thicker oxide film formed on aluminum surface. The probability of pitting corrosion was estimated with the relation between Ecorr and Erep value in anodic polarization measurement in the solution.
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