Abstract
The initial corrosion behavior of nickel exposed under sheltered conditions in a rural atmosphere has been investigated using two starting dates in April and October. Emphasis has been placed upon short‐term exposure periods from 1 day to 4 months but longer exposure periods up to 1.5 years have also been included. A multianalytical approach has been used to characterize the corrosion products, which have resulted in a coherent picture with respect to both surface composition and morphology. Within hours of exposure, a thin film of NiO and is observed on the freshly polished nickel surface. After a few days, independent of starting date, sulfate‐containing corrosion products are formed with characteristic dendritic morphology. The sulfate‐containing corrosion products grow laterally and cover 25 to 30% of the nickel surface after 120 days of exposure. Promoted by initial dry and wet periods and by increased concentrations of sulfate particulates, the formation of sulfate‐containing corrosion products is faster in April than in October. After 1 year of exposure, the composition is .
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