鉄および鉄合金の陽極的不働態化におよぼす水素イオンおよび硫酸イオンの影響

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  • Effects of Hydrogen and Sulphate Ions on the Anodic Passivation of Iron and Its Alloys (Electrochemical Properties of Stainless Steel (III))
  • テツ オヨビ テツ ゴウキン ノ ヨウキョクテキ フドウタイカ ニ オヨボス スイソ イオン オヨビ リュウサン イオン ノ エイキョウ

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Anodic polarization behaviours and Flade potentials of pure iron, 40 per cent nickel-iron alloy and 14 per cent chromium-iron alloy in sulphuric acid solutions were studied. The effects of hydrogen ion concentration (pH=−0.3∼4) and sulphate ion concentration (0.2∼1.5 g-ion/L) were examined, keeping concentration of either ion species constant. The results obtained were summarized as follows:<BR>(1) Sulphate ion has a marked effect on the passivation of pure iron. That is, the potential needed for passivation becomes less noble with increasing concentration of sulphate ion up to a definite concentration (0.8 g-ion/L for solution of pH=1).<BR>(2) The effect of sulphate ion which favours the anodic passivation of pure iron becomes less remarkable as the alloying element nickel or chromium in steel increases. Therefore sulphate ion concentration hardly affects the passivation of 40 per cent nickel-iron alloy and 14 per cent chromium-iron alloy.<BR>(3) In the solutions in which sulphate ion concentration has a marked effect on the passivation, the potential needed for passivation does not coincide with the Flade potential. That is, there is a potential range, more noble than Flade potential, in which the passivity of iron and low alloy steels is not maintained.<BR>(4) Effects of sulphate ion concentration on the potential needed for passivation are not recognized in potential decay curve.

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