The corrosion resistance of a series of commercial nickel alloys was investigated. The alloys studied were 242 (N10242), B-10 (N10624) and B-3 (N10675) alloys. Standard resistance polarization and potentiodynamic tests were performed as a function of the concentration of ferric ions, in deaerated 20% HCl solutions. Testing was carried out at ambient temperature. Results clearly showed that ferric ions, added as oxidizing impurities in HCl solutions, were very detrimental to such nickel alloys and profoundly affected their corrosion behavior. In general, it was found that the alloys which contain low Cr and high Mo contents exhibit excellent corrosion resistance in pure HCl, but poor resistance in iron-contaminated solutions. In addition, it seems that the presence of iron (6%) in B-10 alloy did not enhance the passivation phenomenon of the material under oxidizing conditions.

Subject
Materials, Ions, Corrosion resistant alloys, Corrosion rate, Materials performance, Nickel based alloys, Molybdenum alloys, Ion concentrations, Current densities, Oxidizers, Corrosion resistance, Alloys, Corrosion potential
Keywords:
Alloy 242 (N10242), Alloy B-10 (N10624), Alloy B-3 (N10675), alloying elements, ferric ions, general corrosion, hydrochloric acid, nickel alloys, resistance polarization, potentiodynamic polarization
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2005
Association for Materials Protection and Performance (AMPP)
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