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Báo cáo hóa học: " The Nature of Surface Oxides on Corrosion-Resistant Nickel Alloy Covered by Alkaline Water

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: The Nature of Surface Oxides on Corrosion-Resistant Nickel Alloy Covered by Alkaline Water | Nanoscale Res Lett 2010 5 613-619 DOI 10.1007 S11671-009-9521-5 NANO EXPRESS The Nature of Surface Oxides on Corrosion-Resistant Nickel Alloy Covered by Alkaline Water Jiaying Cai D. F. Gervasio Received 16 November 2009 Accepted 17 December 2009 Published online 5 January 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract A nickel alloy with high chrome and molybdenum content was found to form a highly resistive and passive oxide layer. The donor density and mobility of ions in the oxide layer has been determined as a function of the electrical potential when alkaline water layers are on the alloy surface in order to account for the relative inertness of the nickel alloy in corrosive environments. Keywords EIS Mott-Schottky Bipolar plates High-temperature PEM fuel cell Nickel alloy Introduction Nickel metal alloys are corrosion resistant and can serve as structural materials in extraordinary environments e.g. in long-term storage containers high-temperature heat exchangers and aggressive chemical reactors. The stability is often attributed to the inertness of the oxides that form on the nickel alloys. One new application of these extraordinary alloys is as the structural material for a metal bipolar plate in a polymer electrolyte membrane PEM fuel cell stack. The bipolar plate is among the most expensive heaviest and voluminous components in the fuel cell stack. The bipolar plates conduct current between cells provide flow channels for reactants and products facilitate water and J. Cai H Department of Chemical Engineering Arizona State University Tempe AZ USA e-mail jiaying.cai@asu.edu D. F. Gervasio Department of Chemical Engineering University of Arizona Tucson AZ USA thermal management and constitute the structural backbone of a fuel cell stack. The materials for bipolar plates need to have high electric and thermal conductivity good corrosion resistance and mechanical strength. Replacing bulky brittle machined .