研究了La_2O_3对镍基合金激光熔覆层耐蚀性的影响.对加与不加La_2O_3的激光熔覆试样进行了对比实验。研究结果表明:La_2O_3的加入对激光熔覆层的组织起到了细化和净化作用,使熔覆层的二次枝晶间距减小,夹杂物含量降低,并明显提高了激光熔覆层的耐蚀性能。
The effect of La2O3 on microstructure and corrosion resistance of laser clad Ni-based alloy coatings was investigated. The experimental results showed that the addition of La2O3 could modify the microstructure and improve corrosion resistance of these coatings. Their microstructure was refined and purified. In the clad coatings containing La2O3, both secondary dendrite space and inclusion percentage were reduced. The corrosion weight loss of the clad coatings with different amounts of La2O3 was much smaller than that of the coatings without La2O3 in HNO3 solution. The anodic polarization curves also proved that the corrosion resistance of the laser clad coatings in HNO3, H2SO4, HCl and NaCl solutions, was significantly improved with the addition of La2O3.
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