|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||LL-90: Unraveling the Role of Mo in the Aqueous Corrosion of Ni-Cr-Mo Alloys by Combining Electrochemical Passivation Studies with Nanoscale Characterization
||Petra Reinke, Gopalakrishnan Ramalingam, Kathleen Lutton, Kateryna Gusieva, Brendy Rincon Troconis, John R. Scully
|On-Site Speaker (Planned)
The detailed processes by which Mo improves passivation, suppresses localized corrosion and repairs oxide layer damage are still not well understood. We combine electrochemical passivation studies of NiCr and NiCrMo with high-resolution scanning probe characterization as a highly complementary to approach this critical materials question. Oxide layers are grown in a wide range of pH values (HCl, H2SO4) mimicking environmental conditions in crevices. The nanoscale characterization unravels the impact of crystallographic orientation and alloy composition on the morphology of the oxides, and is correlated with a variety of AC and DC corrosion electrochemical analysis. STM and conductive AFM deliver complementary information on charge and field distributions at the surface, which is speculated to play an important role in passivity and passivity breakdown. Analysis of this work will reveal the correlation between nanoscale morphology, oxide electronic properties and corrosion behavior as a function of alloys composition and passivation treatment.
||Planned: A print-only volume