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利用双层辉光等离子渗金属技术,在0Cr18Ni9Ti不锈钢表面形成厚约65μm、均匀致密连续的渗锆合金层,并对不锈钢基材与渗锆合金层分别进行硬度检测与电化学腐蚀性能测试。结果表明:渗锆后,试样表面的硬度约为1530 HV0.05,明显大于不锈钢基材的表面硬度(约为350 HV0.05);渗Zr合金层的硬度由表及里逐渐降低,呈梯度分布;在0.5 mol·L-1H2SO4溶液、0.5 mol·L-1HNO3溶液、3.5%NaCl溶液中,不锈钢基材的相对腐蚀速度分别是渗Zr合金层的2.18倍、9.73倍、2.44倍;未处理的不锈钢表面腐蚀较为严重,而渗Zr合金层表面只出现轻微的局部腐蚀,可见经渗锆处理后,不锈钢的耐蚀性能有所改善。
The dual-layer glow plasma infiltration metal technique was used to form a uniform and dense continuous zirconia alloy layer on the surface of 0Cr18Ni9Ti stainless steel. The hardness and electrochemical corrosion resistance of the stainless steel substrate and the infiltration zirconium alloy were tested respectively. The results show that the hardness of the sample surface is about 1530 HV0.05, which is obviously larger than the surface hardness of the stainless steel substrate (about 350 HV0.05) In the 0.5 mol·L-1H2SO4 solution, 0.5 mol·L-1HNO3 solution and 3.5% NaCl solution, the relative corrosion rates of stainless steel substrate were 2.18 times, 9.73 times and 2.44 times that of the infiltration Zr alloy layer respectively. The surface of the treated stainless steel is more seriously corroded, while only a slight localized corrosion appears on the surface of the infiltrated Zr alloy. It can be seen that the corrosion resistance of the stainless steel improves after the zirconia treatment.