The effect of noble metal addition on polarization behavior of hydrogen (H2) oxidation and oxygen (O2) reduction on type 304 stainless steel (SS, UNS S30400) in high-temperature, high-purity water was studied. Incorporation of small amounts of noble metals dramatically improved H2 oxidation kinetics and, thus, enhanced the catalytic recombination efficiency of H2 to O2 to form H2O. Enhancement in the catalytic nature on the type 304 SS surface doped with noble metals resulted in the thermodynamically lowest electrochemical corrosion potential (< –500 mVSHE) when a stoichiometric or higher amount of hydrogen was present in the water.

Subject
Water, Intergranular stress corrosion cracking, Hydrogen concentration, Metal surfaces, Noble metals, Oxidation behavior, Polarization curves, Molar ratio, Oxide surfaces, Risk reduction, Polarization, Hydrogen, Oxidation
Keywords:
boiling-water reactor, corrosion potential, high-temperature water, hydrogen, hydrogen peroxide, noble metal, oxygen, polarization, type 304 stainless steel
NACE International
1999
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