Corrosion-Resisting Films of Titanium and Zirconium in High Temperature Water and Several Aqueous Chloride Solutions

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  • TiおよびZrの高温水ならびに塩化物水溶液中における耐食性被膜
  • Ti オヨビ Zr ノ コウオンスイ ナラビニ エンカブツ スイヨウエキ チュウ ニ オケル タイショクセイ ヒマク

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Abstract

The present authors have been studied corrosion-resisting films and surfaces produced on Ti and Zr by the electron microscopic and diffraction method. The following results were obtained. (1) The corrosion-resisting films of Ti produced in high temperature water (200°C, 6 hr) consist of rutile and anatase. Zr plate was covered with monoclinic and cubic type ZrO2 crystals showing the preferred orientations of their {110} and {100} planes parallel to metal surfaces, but these oriented films were not found on the cast specimens under the same conditions. (2) The protective films of Ti immersed in boiling 10 and 28 wt%NaCl solutions consist of anatase or anatase and rutile respectively. The surface films produced on Ti in artifical sea water and 10 wt%NaCl solution (200°C, 6 hr) were composed of rutile and anatase, and the surfaces were individually protected with rutile or rutile and-α-Ti2O3 when the specimens were corroded in high temperature 20 or 28 wt%NaCl solution. (3) Zr plates dipped in artificial sea water, 10∼28 wt%NaCl solutions (200°C, 6 hr) or boiling 10 wt%AlCl3, MgCl2 and NH4Cl solutions were covered with the oriented ZrO2 films. (4) Rutile was found on Ti surface dipped in boiling 10 wt%FeCl3 solution, while the films consisting of rutile and anatase were detected on the surfaces of Ti boiled in 10 wt%CuCl2 solution. However, the protective films of Ti in boiling 10 wt%AlCl3, MgCl2 and NH4Cl solutions were composed of anatase.

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