Abstract
A nickel alloy with high chrome and molybdenum content was found to form a highly resistive and passive oxide layer. The donor density and mobility of ions in the oxide layer has been determined as a function of the electrical potential when alkaline water layers are on the alloy surface in order to account for the relative inertness of the nickel alloy in corrosive environments.
Highlights
Nickel metal alloys are corrosion resistant and can serve as structural materials in extraordinary environments, e.g., in long-term storage containers, high-temperature heat exchangers and aggressive chemical reactors
The results showed that the alloy oxidized in 0.1 M KOH had a higher Interfacial Contact Resistance (ICR) value than that in 1.0 M KOH solution
The oxide film that forms on nickel alloy C22 is affected by film formation potential and pH
Summary
Nickel metal alloys are corrosion resistant and can serve as structural materials in extraordinary environments, e.g., in long-term storage containers, high-temperature heat exchangers and aggressive chemical reactors. Electrochemical impedance spectroscopic (EIS) and Mott–Schottky (M–S) methods were used to determine the density and mobility of charge carriers in the passive oxide layer to understand the nature of the surface oxides and how these affect the corrosion resistance of C22 nickel alloy covered by alkaline water.
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