Abstract
Abstract The localized corrosion of pure and sulfur-doped Ni has been investigated in 0.25 M Na2SO4 (pH 6.5), both with and without addition of chloride ions, at 25 C. Addition of more than 500 ppm l− to Na2SO4 solution is found to cause pitting of annealed pure Ni. Auger electron spectroscopy (AES) examination of the fracture surface of nickel previously exposed to SO2 at 800 for 10 min showed that sulfur had penetrated along the grain boundaries by ∼100 µm. Grain boundary sulfur coverage of more than about 0.01 monolayer causes pitting, with induction time and pitting potential independent of increasing sulfur coverage, in 0.25 M Na2SO4 (pH 6.5), both with and without l−. The diffusivity of sulfur along grain boundaries in Ni at 800 is calculated to be ∼4.6×10−10m2/S.
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