Effect of ClO<sub>3</sub><sup>-</sup> on Electrochemical Behaviors of Iron, Nickel and Austenitic Stainless Steels in Caustic Soda Solutions

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  • 苛性ソーダ溶液中での鉄, ニッケル, およびオーステナイト系ステンレス鋼の電気化学特性に及ぼすClO<sub>3</sub><sup>-</sup>の影響
  • カセイソーダ ヨウエキチュウ デ ノ テツ ニッケル オヨビ オーステナイトケ

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Abstract

Polarization measurement was conducted on iron, nickel, and austenitic stainless steels in hot caustic soda solutions containing ClO3- to investigate the effect of ClO3- on corrosion behaviors of those metals and alloys. Chlorate ions decompose into ClO-, and this chemical reaction is stimulated by the addition of some metallic species and/or ions such as Mo (III) and Fe (II). Cathodic reduction of ClO- to Cl- is easy but ClO3- is electrochemically stable, so that cathodic reduction of ClO3- to ClO- and/or Cl- is difficult to occur directly. However, since ClO3- converts into ClO- and Cl- by consecutive reactions, ClO3- is detrimental to the passive film on metals and alloys in a caustic soda environment.

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