The Weathering of Nickel/Chromium Electrodeposits

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Abstract
The atmospheric corrosion of nickel foils, both wrought and electro-deposited, proceeds by pitting leading to perforation. This result, coupled with earlier tests showing that “porosity-test” reagents can produce pores during porosity tests, suggests that properly produced nickel electrodeposits may be far less porous than has been thought. A chromium film on top of nickel is helpful in the early stages of industrial atmosphere exposure but may accelerate pitting in the later stages owing to the galvanic action of the nickel/chromium couple. The number per unit area, size and shape of the pits vary widely. Factors influencing the type of pitting are the chemical composition and microstructure of the metal and its residual stresses.

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