High Temperature Corrosion of Some Heat Resisting Steels in the Presence of Lead Oxide

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  • 酸化鉛による実用耐熱鋼の高温異常腐食
  • サンカ ナマリ ニ ヨル ジツヨウ タイネツ コウ ノ コウオン イジョウ フショク

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It has already been recognized by many reserchers that the lead oxide (PbO) causes catastrophic corrosion of steels at high temperatures. But most of the studies dealt with the reactions in the molten state of PbO.<BR>The present study was carried out on the effects of heating temperature and atmosphere on the high temperature corrosion of some heat resesting steels at temperatures below the melting point of PbO.<BR>The experimental results are summarized as follows:<BR>(1) The catastrophic corrosion of heat resisting steels caused by PbO occurred even at temperatures below the melting point of PbO in both air (an oxidizing atmosphere) and argon gas (an oxygen depleted atmosphere).<BR>(2) PbO-corrosion resistance of 21-4N steel was excellent, followed by SUH 31B, 21-12N. SUH 3B and SUS 53B were least resistant.<BR>(3) The X-ray diffraction data confirmed that the main components of the corrosion products were 5PbO·CrO3 and PbO·6Fe2O3. Metallic lead was also detected when the steels were heated in the presence of PbO in argon gas. These results show that when PbO is present, Cr+3 ions tend to be oxidized to a higher valence state of Cr+6, leading to the formation of higher complex oxides than Cr2O3.

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