溶解氧对Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr合金在500 °C和10.3 MPa过热蒸汽中耐腐蚀性能的影响

来源期刊:中国有色金属学报(英文版)2020年第3期

论文作者:孙蓉蓉 徐诗彤 姚美意 张骏 戴训 黄娇 张金龙 周邦新

文章页码:701 - 709

关键词:锆合金;溶解氧;腐蚀;显微组织;氧化膜;过热蒸汽

Key words:zirconium alloy; dissolved oxygen; corrosion; microstructure; oxide film; super-heated steam

摘    要:为了更好地了解溶解氧对锆合金耐腐蚀性能的影响,研究Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr(质量分数,%)合金在1×10-6溶解氧和除氧的500 °C和10.3 MPa过热蒸汽中的耐腐蚀性能。利用SEM、TEM、EDS、EBSD研究合金和氧化膜的显微组织。结果表明,高的溶解氧含量会加速合金的腐蚀。与除氧条件相比,在溶解氧条件下氧化膜更疏松且微裂纹更多,氧化膜内表面更加凹凸不平。对于除氧条件下形成的氧化膜,其(002)m、 和(101)t晶面的选区电子衍射斑点较强,而(001)m和 晶面的选区电子衍射斑点较弱;而在溶解氧条件下形成的氧化膜,其(111)m、(200)m和(101)t晶面的选区电子衍射斑点较强,而 (100)m和(110)m晶面的选区电子衍射斑点较弱。在过热蒸汽条件下较高的溶解氧含量会加速氧化膜的生长,进而降低锆合金的耐腐蚀性能。

Abstract: To better understand the role of dissolved oxygen (DO) in affecting corrosion behavior of zirconium alloys, the Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr (wt.%) alloy was corroded in super-heated steam at 500 °C and 10.3 MPa under 1×10-6 DO and deaeration conditions. The microstructure of the alloy and oxide films was investigated by SEM, TEM, EDS and EBSD. Results show that the corrosion is aggravated under 1×10-6 DO. Compared with the deaeration condition, the oxide film is looser, and has more micro-cracks and more uneven inner surface under DO condition. For the oxide film forming under deaeration condition, the selected area diffraction (SAED) spots of planes (002)m, and (101)t are strong, while those of the (001)m and are weak. However, for the oxide film forming under DO condition, the SAED spots of planes (111)m, (200)m and (101)t are strong, while those of the (100)m and (110)m are weak. The higher DO content in super-heated steam accelerates the growth of oxide films, thus decreasing the corrosion resistance of zirconium alloys.

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号