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采用化学复合镀法制备了Ni-P-纳米TiO2复合镀层,研究了纳米TiO2添加对Ni-P复合镀层的显微结构、硬度、耐磨性、孔隙率及耐蚀性的影响,并讨论了其影响机理。结果表明:纳米TiO2粒子较为均匀地分布在Ni基镀层,未发生明显团聚;纳米TiO2粒子的弥散强化作用,使复合镀层具有较高的表面硬度和良好的耐摩擦性能,晶化热处理后的复合镀层表面硬度达到了10 925 MPa,耐摩擦性能也显著提高。添加纳米TiO2粒子后,镀层的孔隙率增加,耐碱和耐盐腐蚀的能力稍有降低,耐HCl溶液腐蚀的能力较差。
Ni-P-nano-TiO2 composite coatings were prepared by chemical composite plating. The effects of nano-TiO2 addition on microstructure, hardness, wear resistance, porosity and corrosion resistance of Ni-P composite coatings were studied. Its impact mechanism. The results show that the nano-sized TiO2 particles are uniformly distributed on the Ni-based coating without obvious agglomeration. The dispersion strengthening effect of the nano-TiO2 particles makes the composite coating have high surface hardness and good rubbing resistance. The composite after the crystallization heat treatment Coating surface hardness reached 10 925 MPa, the friction performance is also significantly improved. Adding nano-TiO2 particles, the porosity of the coating increases, the ability of alkali resistance and salt corrosion slightly lower resistance to HCl solution corrosion worse.