Abstract
Effect of pH values on pitting dynamics and morphology of single pits of 304 stainless steel in 3.5%NaCl solution was studied by means of potentiostatic polarization and 3-dimensional video microscope. The results showed that the pitting current, the growth rate of pit volume, the pit depth and pit mouth diameter of single pits increase with the decreasing pH in a range 1 to 14 by applied potential of 0.15 Vvs SCE. In solutions with the same pH, the growth rate of pit depth increas- es with time, while the growth rate of pit mouth diameter decreases with time. In solutions with dif- ferent pH, the growth of single pit is controlled by the diffusion through corrosion products. There exists lacy cover on the wall of pit mouth, and the integrity of the lacy cover declines with the in- crease of pH.
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