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The 5th William Blum Lecture, Pitting of Decorative Nickel-Chromium Coatings
Author: Dr. W. Andrew Wesley
Issue: , 1963The status of the knowledge of the weathering of nickel-chromium coatings is reviewed, attention being focused on the process of corrosion of the chromium and nickel layers. This is not as well understood as is the subsequent attack of the basis metal. It is shown that the present theories are useful guides to investigators in their search for new coating systems. Surface pitting of the coatings is characterized by randomness of pit sites, a density of sites below 10,000 per cm2 and a marked dependence upon exposure conditions. It is suggested that new experiments be based upon the hypothesis that the pitting process initiates with corrosion of the chromium layer. These would utilize instantaneous polarization techniques. They would include a search for a relationship between lattice defects and the nucleation of pits, also a study of the influence of the nature and structure of the metal layer just under the chromium on pit initiation.
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