ABSTRACT
Nickel and its alloys provide strong corrosion-resistant materials that are indispensable to sustain modern technologies including chemical engineering, marine applications, aircraft gas turbine engines, electric resistance heating and other high temperature functions. The aqueous chemistry of nickel and hence its corrosion behaviour is determined by its position as the eighth element in the first transition series of the Periodic Table. The corrosion of nickel is very slight in unpolluted air. It is too expensive for use in the natural atmosphere by itself, but it is valuable as a coating to protect steel. Nickel has excellent corrosion resistance in neutral and alkaline solutions of chlorides, carbonates, sulfates nitrates, acetates and concentrated alkalis up to their boiling points, extending to boiling solutions of 25 mass " of sodium or potassium hydroxides. The particular conditions in which a nickel alloy can resist corrosion depend on which of the components, copper, chromium, or molybdenum, is dominant.
