Microstructure and corrosion resistance of laser clad coatings with rare earth elements
Microstructure and corrosion resistance of laser clad coatings with rare earth elements
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DOI：
10.1016/s0010-938x(00)00081-0
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发表时间：
2001-02-01
影响因子：
8.3
通讯作者：
Zhu, YM
中科院分区：
文献类型：
--
作者：
Wang, KL;Zhang, QB;Zhu, YM
研究了稀土氧化物CeO2和La2O3对激光熔覆镍基合金涂层组织和耐蚀性的影响。将含有CeO2或La2O3的镍基合金粉末激光熔覆到钢基体上。研究了涂层的显微组织特征、成分、相结构和耐蚀性。结果进行了比较，与那些涂层没有CeO2和La2O3。结果表明，CeO2和La2O3的加入可以细化和净化涂层的组织，减少基体对涂层材料的稀释。此外，稀土氧化物的加入还能引起涂层相结构的变化：（a）衍射角增大，（B）晶面间距减小，（c）晶格常数减小，（d）出现新的稀土化合物。稀土元素显著提高了熔覆层的耐蚀性。本文还讨论了这些影响的机理。(C)2001爱思唯尔科技有限公司版权所有。
The effects of rare earth oxides CeO2 and La2O3 on the microstructure and corrosion resistance of laser clad nickel-based alloy coatings were investigated. The nickel-based alloy powder with CeO2 or La2O3 was laser clad on to a steel substrate. The coatings were examined for microstructural features, compositions, phase structure and corrosion resistance. The results were compared with those for coatings without CeO2 and La2O3. The comparison indicated that the addition of CeO2 or La2O3 can refine and purify the microstructure of coatings and reduce dilution of clad material from the substrate. Moreover, the addition of rare earth oxide can cause the following Variations of phase structure of the coating: (a) increase of diffraction angle, (b) decrease of interplanar spacing, (c) reduction of lattice constant and (d) appearance of new compounds with the rare earth. The corrosion resistance of clad coating with rare earths was enhanced significantly. The mechanism of these effects is also discussed in this paper. (C) 2001 Elsevier Science Ltd. All rights reserved.