Abstract
By gravimetric method, the corrosion rate of Ni electroplates is determined during the accelerated tests in neutral and acidic salt fog of 5% NaCl solution. In neutral fog, the electroplates corrode uniformly with a small mass loss even during long-term exposure. In acidic fog, corrosion is twice more intense: not only the surface passive layer of dull electroplates becomes broken down, but also, with an increase in the exposure time, surface defects form, which cause even greater losses of metal. Bright Ni electroplates, differing in surface morphology from dull Ni coatings corrode intensely but uniformly. Corrosion of composite Ni–Al2O3electroplates decelerates with time, and they demonstrate corrosion resistance in accelerated tests in both types of media.
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