High corrosion resistant Nickel (Ni) alloys, such as UNS(1) N010276 and UNS N06022, are widely used in severe corrosive environment of chemical plants. To achieve high corrosion resistance, these alloys contain a large amount of rich elements such as molybdenum (Mo) and nickel, which results in higher material cost.

In this study, the effect of copper (Cu) addition as a substitute of Mo, on wet corrosion resistance of Ni alloy was investigated. The alloy with 3%Cu and 6%Mo showed excellent corrosion resistance in both oxidizing and reducing acids. Effect of Cu addition was discussed with the results of electrochemical measurement and surface analysis. It was indicated that corrosion resistance to sulfuric acid is improved by concentrated Cu near surface.

Field evaluation of corrosion resistance on developed alloy (UNS N06845) was also conducted in the commercial chemical plant for 1 year. UNS N06845 showed comparable corrosion resistance to conventional Ni-alloys in sulfuric acid containing media, and so it was concluded that UNS N06845 is applicable to various corrosive parts in chemical plants.

Subject
Acids, Materials, Corrosion resistant alloys, Corrosion rate, Metal surfaces, Sulfuric acid, Molybdenum alloys, Corrosion testing, Corrosion reactions, Copper alloys, Surface analysis, Metals, Corrosion resistance
Keywords:
nickel alloy, copper, acid resistance, field test, chemical plant
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2013
Association for Materials Protection and Performance (AMPP)
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