The effects of Cu and Zn impurities on the electrochemical corrosion potential (ECP) of 304 stainless steel (SS) and electrochemical polarization behavior of oxygen and hydrogen reactions in high temperature water were investigated. The experimental data clearly demonstrated that without catalytically active sites on 304 SS surface, the presence of Cu raised the 304 SS ECP by as much as 300mV in hydrogen water chemistry. The presence of Cu and Zn in the water or on the surface did not affect the ECP of noble metal treated 304 SS, showing a low ECP (-450 to -500 mVshe) when stoichiometric excess hydrogen is present. However, about 10 to 20 % decrease in recombination efficiency of oxygen and hydrogen reactions on the catalytic surface in the presence of Cu was measured.

Subject
Water, Metal surfaces, Noble metals, Electrochemical reactions, Water chemistry, Oxide surfaces, Zinc oxide, Oxygen, Risk reduction, Electrodes, Hydrogen, Oxidation, High temperature
Keywords:
high temperature water, noble metal alloy, polarization, oxygen and hydrogen reactions, stainless steel, recombination kinetics
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2000
Association for Materials Protection and Performance (AMPP)
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