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51315-5799-Effect of Copper on Crevice Corrosion Inhibition of Ni-Cr-Mo Alloy in Aggressive Conditions

Picture for Effect of Copper on Crevice Corrosion Inhibition of Ni-Cr-Mo Alloy in Aggressive Conditions
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Product Number: 51315-5799-SG
ISBN: 5799 2015 CP
Author: Ajit Mishra
Publication Date: 2015
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Effect of Copper on Crevice Corrosion Inhibition of Nickel-Chromium-Molybdenum Alloy in Aggressive Conditions Ajit Mishra1* and D.W. Shoesmith12 1Department of Chemistry Western University London ON N6A 5B7 Canada 2Surface Science Western 999 Collip Circle London ON N6G 0J3 CanadaAbstract:The effect of Cu on the localized corrosion of Ni-Cr-Mo alloys has been investigated in hot saline solutions by comparing the behavior of alloys 59 (UNS N06059) and C-2000 (UNS N06200) using electrochemical and surface analytical techniques. Copper did not have any measurable effect on passive film properties or on either the breakdown and repassivation potentials or the protection temperature. Galvanostatically controlled crevice corrosion experiments clearly demonstrated that copper suppressed metastable breakdown events precursor for stable pits. Dynamic secondary ion mass spectrometry (D-SIMS) showed copper accumulated in crevicecorroded locations but could not confirm any influence of copper on crevice propagation. The primary influence of Cu in Ni-Cr-Mo alloys appears to be its abilityto inhibit crevice initiation by stifling the metastable pitting events which can eventually lead to the establishment of actively propagating locations.Keywords: Ni-Cr-Mo alloys Copper Crevice Corrosion Potentiodynamic-Galvanostatic-Potentiodynamic technique SEM EDX Dynamic-SIMS* currently Staff Engineer R&T Haynes International Kokomo Indiana US
Effect of Copper on Crevice Corrosion Inhibition of Nickel-Chromium-Molybdenum Alloy in Aggressive Conditions Ajit Mishra1* and D.W. Shoesmith12 1Department of Chemistry Western University London ON N6A 5B7 Canada 2Surface Science Western 999 Collip Circle London ON N6G 0J3 CanadaAbstract:The effect of Cu on the localized corrosion of Ni-Cr-Mo alloys has been investigated in hot saline solutions by comparing the behavior of alloys 59 (UNS N06059) and C-2000 (UNS N06200) using electrochemical and surface analytical techniques. Copper did not have any measurable effect on passive film properties or on either the breakdown and repassivation potentials or the protection temperature. Galvanostatically controlled crevice corrosion experiments clearly demonstrated that copper suppressed metastable breakdown events precursor for stable pits. Dynamic secondary ion mass spectrometry (D-SIMS) showed copper accumulated in crevicecorroded locations but could not confirm any influence of copper on crevice propagation. The primary influence of Cu in Ni-Cr-Mo alloys appears to be its abilityto inhibit crevice initiation by stifling the metastable pitting events which can eventually lead to the establishment of actively propagating locations.Keywords: Ni-Cr-Mo alloys Copper Crevice Corrosion Potentiodynamic-Galvanostatic-Potentiodynamic technique SEM EDX Dynamic-SIMS* currently Staff Engineer R&T Haynes International Kokomo Indiana US
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