中性塩電解液中におけるＳＵＳ４３０鋼の電解脱スケール機構

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タイトル別名
  • Mechanism of Electrolytic Descaling of SUS 430 Steel in Neutral Electrolyte
  • チュウセイエン デンカイエキチュウ ニ オケル SUS430 コウ ノ デンゲ

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抄録

In this report, the structure of oxide film formed on the surface of 17 Cr steel, heated at 830°C in air for 100 s, is determined by means of X-ray diffraction, electron diffraction and X-ray photoelectron spectroscopy. The descaling mechanism in electrolytes of sodium chloride and sodium nitrate is experimentally investigate. Results obtained are given in following. (1) The layer of the scale is composed of two types of oxide with a corundum structure, which is identified to be Cr2O3 and α-Fe2O3. (2) In NaCl electrolyte, layer of the scale is not dissolved at all by the anodic dissolution but the base metal is dissolved in those area exposed to electrolyte through some scale defects. (3) In NaNO3 electrolyte, layer of the scale is removed by the dissolution of Cr2O3 of the scale. The formation of passive film on descaled surface is confirmed by means of X-ray photoelectron spectroscopy. Two type of oxygen with different binding energies of 531. 3 eV and 529. 6 eV, which correspond to the binding energies of oxygen in hydroxides and oxides respectively, are observed in the photoelectron spectra of O 1s of passive film on the descaled surface.

収録刊行物

  • 精密機械

    精密機械 50 (6), 951-956, 1984

    公益社団法人 精密工学会

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