2Cu相的氧化及其氧化物的擴(kuò)散遷移,抑制氧化膜中裂紋的產(chǎn)生,延緩氧化膜中柱狀晶向等軸晶形態(tài)的轉(zhuǎn)變,從而提高含Cu鋯合金的耐腐蝕性能。"/>

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Zr-Nb-Cu合金在500℃/10.3MPa過熱蒸汽中的腐蝕行為
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上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室,上海大學(xué)微結(jié)構(gòu)重點(diǎn)實(shí)驗(yàn)室

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國家自然科學(xué)基金資助(項(xiàng)目號51271104,51171102)


Corrosion Behavior of Zr-Nb-Cu Alloys in 500℃/10.3MPa Steam
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Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University,Laboratory for Microstructures,Shanghai University

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    摘要:

    將添加不同Cu、Nb含量的Zr-Nb-Cu合金在500 ℃/10.3 MPa過熱蒸汽條件下腐蝕,用TEM和SEM研究合金腐蝕后生成氧化膜的顯微組織。結(jié)果表明：添加Nb或Cu元素總含量較低時(shí),Zr-Nb-Cu合金在500 ℃/10.3 MPa過熱蒸汽中會出現(xiàn)較嚴(yán)重的不均勻腐蝕。Zr-0.2Nb-0.2Cu和Zr-0.2Nb-1.0Cu合金表現(xiàn)出較好的耐腐蝕性能；Zr-0.2Nb-Cu合金中的Cu含量達(dá)到0.2 wt%后,能夠完全抑制不均勻腐蝕現(xiàn)象的發(fā)生,但在實(shí)驗(yàn)條件下繼續(xù)提高Cu含量對其耐腐蝕性能的影響作用不大。鋯合金腐蝕生成氧化膜中的微結(jié)構(gòu),特別是微孔洞、微裂紋等缺陷的形成與合金元素及第二相的氧化過程密切相關(guān)。Nb元素的存在會延緩Zr2Cu相的氧化及其氧化物的擴(kuò)散遷移,抑制氧化膜中裂紋的產(chǎn)生,延緩氧化膜中柱狀晶向等軸晶形態(tài)的轉(zhuǎn)變,從而提高含Cu鋯合金的耐腐蝕性能。

    Abstract:

    The corrosion behavior of Zr-Nb-Cu alloys in 500 ℃/10.3 MPa superheated steam were investigated in the present work. Severe non-uniform corrosion was occured in Zr-Nb-Cu alloys with low content of Nb or Cu elements, while Zr-0.2Nb-0.2Cu and Zr-0.2Nb-1.0Cu alloys demonstrated relative good corrosion resistance. It was found that the non-uniform corrosion behavior has been fully inhibited in Zr-0.2Nb-0.2Cu alloy, and further increase of amount of Cu element showed slight effect on the corrosion resistant behavior. The microstructure of zirconium alloys (especially the micro-pores, micro-cracks) is strongly related to the oxidation of alloying elements and precipitates. The presence of Nb in zirconium alloys would delay the oxidation of Zr2Cu phase and the corresponding diffusion of the oxidation products. Moreover, Nb element could also inhabit the formation of the cracks in the oxide film and the delay the transformation from columnar to equiaxed crystal morphology. Therefore, the addition of Nb element could improve the corrosion resistance of the zirconium alloys containing Cu elements.

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李強(qiáng),馬帥,楊艷平,梁雪,彭劍超,姚美意,周邦新. Zr-Nb-Cu合金在500℃/10.3MPa過熱蒸汽中的腐蝕行為[J].稀有金屬材料與工程,2018,47(9):2761~2766.[Li Qiang, Ma Shuai, Yang Yanping, Liang Xue, Peng Jianchao, Yao Meiyi, Zhou Bangxin. Corrosion Behavior of Zr-Nb-Cu Alloys in 500℃/10.3MPa Steam[J]. Rare Metal Materials and Engineering,2018,47(9):2761~2766.]
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  • 收稿日期:2016-11-10
  • 最后修改日期:2017-04-28
  • 錄用日期:2017-06-26
  • 在線發(fā)布日期: 2018-11-01
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