Corrosion Mechanism of Nickel in Hot, Concentrated H 2 SO 4

Electrochemical techniques, complemented by weight change and ex situ X‐ray spectroscopic measurements, were employed to characterize the corrosion of nickel in concentrated H2SO4 solutions. By use of a rotating cylinder electrode, it was found that corrosion is a mass‐transport controlled process with the convective diffusion of nickel cations from a saturated NiSO4 layer as its rate‐determining step. The oxidizing nature of the acid solution …