Corrosion Currents and the Durability of Composite Nickel Coatings

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Abstract
The zero-resistance ammeter technique has been used to measure the corrosion currents flowing between two electrodcposited test foils and a platinum cathode, connected together externally and immersed in a dilute, acidified, saline solution. Measurements of current were made with various types and sizes of nickel foils under varied environmental conditions. From the results, conclusions are drawn concerning the effects, upon the protection afforded by a double-layer nickel/chromium coating, of the acidity of the environment: the proportion of semi-bright nickel in the deposit: the density of discontinuities in the chromium layer; and. the thickness of the composite coating. Some results of exposure and accelerated corrosion tests on double-layer nickel deposits are described and the results of a few experiments with coupled copper and nickel foils are given.