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利用双层辉光等离子表面合金化技术,在Q235钢表面直接合成TiN渗镀层,该渗镀层由TiN颗粒均匀分布的扩散层及表面TiN沉积层组成。将TiN渗镀层与Q235钢基体和1Cr18Ni9Ti不锈钢在4%的NaOH溶液、l mol/L H2SO4溶液和3.5%NaCl溶液中分别进行电化学腐蚀对比试验。结果表明:在4%的NaOH溶液中,TiN渗镀层的耐蚀性能比Q235钢提高了26.8倍,与1Cr18Ni9Ti不锈钢相当;在l mol/L H2 S04溶液中,TiN渗镀层耐腐蚀性能比Q235钢提高了10.5倍,比1Crl8Ni9Ti不锈钢提高了1.65倍;在3.5%的NaCl溶液中,TiN渗镀层耐腐蚀性能比Q235钢提高了10.3倍,但比1Crl8Ni9Ti不锈钢稍差。TiN渗镀层耐酸碱性溶液腐蚀性能要比耐盐溶液腐蚀性能强。
By using double-layer glow plasma surface alloying technology, the TiN infiltration layer is directly synthesized on the surface of Q235 steel. The infiltration layer is composed of diffusion layer with uniform distribution of TiN particles and surface TiN deposition layer. The TiN coatings were compared with Q235 steel substrates and 1Cr18Ni9Ti stainless steel in 4% NaOH solution, 1 mol / L H2SO4 solution and 3.5% NaCl solution respectively. The results show that in 4% NaOH solution, the corrosion resistance of TiN coating is 26.8 times higher than that of Q235 steel, which is equivalent to that of 1Cr18Ni9Ti stainless steel. The corrosion resistance of TiN coating is better than Q235 steel in 1 mol / L H2SO4 Which is 10.5 times higher than that of 1Crl8Ni9Ti stainless steel, which is 1.65 times higher than that of 1Crl8Ni9Ti stainless steel. In 3.5% NaCl solution, the corrosion resistance of TiN coating is increased by 10.3 times than that of Q235 steel but slightly worse than that of 1Crl8Ni9Ti stainless steel. TiN coating acid corrosion solution than the corrosion resistance of salt solution strong.