The effect of Pd or Pt additions on electrochemical corrosion potential (ECP) behavior of various alloys was investigated in 288°C water containing oxygen (O2), hydrogen (H2), and hydrogen peroxide (H2O2). Data showed the noble-metal alloying additions improved catalytic efficiency for recombination of O2 and H2 on the surface and lowered ECP for intergranular stress corrosion cracking (IGSCC) protection when stoichiometric excess H2 was present.

Subject
Noble potential, Water, Intergranular stress corrosion cracking, Metal surfaces, Noble metals, Water chemistry, Molar ratio, Immersion, Risk reduction, Alloys, Electrodes, Corrosion potential, Electrode potential
Keywords:
alloy 600, electrochemical corrosion potential, high-temperature water, hydrogen, hydrogen peroxide, low-alloy steel, noble metals, oxygen, type 304 stainless steel
NACE International
1996
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