Abstract
The electrodeposited equiatomic tin‐nickel alloy exhibits a strong corrosion passivity. There has been some conjecture as to why this alloy exhibits this passivity and as to the nature of the passive surface film. This work investigates the surface film which is formed in air, using Auger electron spectroscopy and depth profiling. The surface film appears to be primarily a tin‐rich oxide which is several atoms thick. The passive film which forms may not depend on the metastable nature of the alloy.
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