高温高酸素圧ＮａＣｌ水溶液中のＦｅ‐Ｚｎ・Ａｌ合金のガルバニ腐食

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  • Galvanic Corrosion of Fe-Zn Al Alloy Couples in a NaCl Solution in High Oxygen Pressure at High Temperature
  • 高温高酸素圧NaCl水溶液中のFe-Zn・Al合金のガルバニ腐食
  • コウオン コウサンソアツ NaCl スイヨウエキチュウ ノ Fe Zn Al ゴウキン ノ ガルバニ フショク
  • Galvanic Corrosion of Fe-Zn•Al Alloy Couples in a NaCl Solution in High Oxygen Pressure at High Temperature

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  Electrochemical characteristics of galvanic couples between iron and zinc•aluminum alloy were studied in a 3 mass% NaCl solution in a high oxygen pressure of 2 MPa at a high temperature of 423 K for 14.4 ks, and those were compared with that of a galvanic couple between iron and zinc. Both the galvanic corrosion potentials and currents of Fe-Zn couple, Fe-Zn•5Al couple and Fe-Zn•55Al couple remarkably changed after a certain period. Then, the polarities of the galvanic corrosion currents of Fe-Zn and Fe-Zn•5Al couples were reversed, indicating that iron is not protected any more. But the polarity of Fe-Zn•55Al couple was not changed although the current was decreased, indicating that iron is still protected. On the other hand, the polarity of Fe-Al couple was not changed throughout the experiment and iron was protected. When iron, zinc and aluminum were connected together at one point, dissolution current of zinc was large in the early stage and gradually became smaller, and the polarity of the current was finally reversed. On the other hand, the dissolution current of aluminum continued to increase. Therefore, aluminum resulted in protecting both iron and zinc from corrosion.<br>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 71 (8), 654-660, 2007

    公益社団法人 日本金属学会

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