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一种利用双层辉光等离子溅射直接复合渗镀合成TiN渗镀层的新工艺方法。该TiN渗镀层表面形貌为‘胞状’组织,颗粒致密均匀,表面为金黄色。TiN渗镀层由TiN颗粒均匀分布的扩散层及表面TiN沉积层组成,渗镀层厚度可达16μm,与基体形成固态冶金层,结合强度高,表面平均显微硬度为3120 HV。对该TiN渗镀层试样,未处理的Q235钢试样,T10淬火+回火试样和3Cr13渗氮试样在相同的条件下进行了耐磨性试验;将该渗镀层试样与未处理的Q235钢和1Crl8Ni9Ti不锈钢试样在1 mo.lL-1H2SO4溶液和3.5%的NaCl溶液中,分别进行了电化学腐蚀对比试验。结果表明:在相同的条件下,TiN渗镀层相对磨损速度最小,耐磨性较未处理的Q235钢试样提高7.81倍,较T10淬火+回火试样提高5.625倍,较3Cr13渗氮试样提高7倍;在浓度为1 mol.L-1的H2SO4溶液中,TiN渗镀层耐腐蚀性能比未处理的Q235钢提高了11.5倍,比1Crl8Ni9Ti不锈钢提高了2.65倍。在浓度为3.5%的NaCl溶液中,TiN渗镀层的耐腐蚀性能比未处理的Q235钢提高11.3倍,但比1Crl8Ni9Ti不锈钢耐蚀性能稍差。
A new method of synthesizing TiN coating by double glow plasma sputtering direct composite coating. The surface morphology of the TiN coating is “cell-like” structure, dense particles uniform, the surface is golden yellow. TiN coating consists of TiN particles uniformly distributed diffusion layer and surface TiN deposition layer. The thickness of the coating layer is up to 16μm, forming a solid metallurgical layer with the substrate. The bonding strength is high and the average microhardness of the surface is 3120 HV. The wear resistance test was carried out under the same conditions for the TiN coating layer sample, the untreated Q235 steel sample, the T10 quenched and tempered sample and the 3Cr13 nitrided sample; Q235 steel and 1Crl8Ni9Ti stainless steel specimens in 1 mo.lL-1H2SO4 solution and 3.5% NaCl solution, respectively, were compared electrochemical corrosion test. The results show that under the same conditions, the relative wear rate of TiN coating is the least, the wear resistance is 7.81 times higher than that of untreated Q235 steel, 5.625 times higher than that of T10 quenched and tempered steel, Increased by 7 times. The corrosion resistance of TiN coating increased by 11.5 times than that of untreated Q235 steel and 2.65 times higher than that of 1Crl8Ni9Ti stainless steel in 1 mol.L-1 H2SO4 solution. In 3.5% NaCl solution, the corrosion resistance of TiN coating is 11.3 times higher than that of untreated Q235 steel, but slightly worse than that of 1Crl8Ni9Ti stainless steel.