Effect of noble metal addition on electrochemical polarization behavior of hydrogen oxidation and oxygen reduction on type 304 stainless steel in high-temperature water

Journal Article · Sat May 01 04:00:00 EDT 1999 · Corrosion

DOI:https://doi.org/10.5006/1.3284007· OSTI ID:6198441

Kim, Y J ^[1]

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1. General Electric Corporate Research and Development Center, Schenectady, NY (United States)

The coolant in boiling-water reactor (BWR) recirculation lines is high-purity, neutral-pH water containing radiolytically generated oxygen (O[sub 2]), hydrogen peroxide (H[sub 2]O[sub 2]), and hydrogen (H[sub 2]). The effect of noble metal addition on polarization behavior of H[sub 2] oxidation and O[sub 2] 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 H[sub 2] oxidation kinetics and, thus, enhanced the catalytic recombination efficiency of H[sub 2] to O[sub 2] to form H[sub 2]O. Enhancement in the catalytic nature on the type 304 SS surface doped with noble metals resulted in the thermodynamically lowest electrochemical corrosion potential (< [minus]500 mV[sub SHE]) when a stoichiometric or higher amount of hydrogen was present in the water.

• OSTI ID: 6198441
• Journal Information: Corrosion, Journal Name: Corrosion Vol. 55:5; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

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ADDITIVES
ALLOYS
AUSTENITIC STEELS
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