2000 Volume 2000 Issue 45 Pages 35-39
This study was intended to connect the modeling of crevice and the electrochemical method of testing in order to examine the crevice corrosion behavior of shot-peened high carbon steel S60C. Experiments were carried out under various potentials on the anodic polarization curve which was obtained in 3% NaCl solution. The effect of shot-peening was compared and examined from corrosion morphology.
The main results obtained are summarized as follows; The crevice corrosion of carbon steel in 3% NaCl solution seems to take place when the potential is set at -0.750--0.800V (vs. S. C. E.) corresponding to passive state region on the anodic polarization. In the event when we intend to understand the crevice corrosion behavior in short time, the correlation between the modeling of crevice and the electrochemical methods of testing seems possible. The pH of solution within the crevice shifts to acid side until it becomes 4.6 owing to the hydrolysis of metallic ions. The corrosion morphology was represented by the general corrosion. The shot-peening may be an effective corrosion inhibition method since the corrosion depths in the outside of crevice or the part of crevice are smaller than the untreated specimen.
