Cr元素含量对镍基合金涂层抗热腐蚀行为的影响

发布时间：2018-06-28 03:27

  本文选题：高速电弧喷涂 + 镍基合金　； 参考：《焊接学报》2017年04期

【摘要】：采用高速电弧喷涂技术在20G钢基体表面制备三种铬含量不同的镍基合金涂层.光学显微镜、X射线衍射、扫描电镜和能谱分析等技术对涂层微观组织结构、相组成及成分进行分析.选用摩尔比为7∶3的Na_2SO_4+K_2SO_4水溶液涂敷刷在涂层表面,分析涂层在650℃下的抗热腐蚀性能.结果表明,涂层的腐蚀动力学曲线基本符合抛物线规律;四种涂层表面均形成了致密连续的NiO和Cr_2O_3保护膜.随着铬含量升高,涂层表面氧化膜中Cr_2O_3含量升高,NiO逐渐减少,涂层抗热腐蚀性能明显提高.Ni-30Cr,Ni-45Cr,Ni-50Cr涂层抗热腐蚀性能分别为20G钢基体的10,15和20倍;Ni-50Cr涂层抗腐蚀性能是美国Tafa 45CT材料的1.4倍.
[Abstract]:Three kinds of nickel based alloy coatings with different chromium content were prepared on 20G steel substrate by high speed arc spraying. The microstructure, phase composition and composition of the coating were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The thermal corrosion resistance of the coating was analyzed at 650 鈩，

本文编号：2076526