摘要
纳米颗粒加入镀液可提高镀层的硬度,并可能影响镀层的耐蚀性能。用化学沉积法制备了纳米TiO2-Ni-P复合镀层。研究了pH值、温度对沉积速度的影响,及表面活性剂种类对镀层硬度的影响,并得出优化配方。镀态和不同温度热处理后的复合镀层的硬度都明显地高于Ni-P合金镀层。用化学法测得了镀层中的TiO2颗粒的含量为2.14%。镀层在400℃下热处理1h后,XRD分析发现镀层结构由非晶态转变为晶态,并出现了强化相Ni3P,其镀层硬度高达HV1100。在3.5%NaCl溶液中测定了合金镀层与纳米复合镀层的自腐蚀电位,发现二者的值相近,且都高于铁基体。
Nanometer-sized TiO2 particle-reinforced nickel-phosphorus matrix composite （TiO2-Ni-P） coatings were prepared by electroless deposition. Influences of pH value and temperature on deposition rate and effects of various surfactants on hardness of the coating were investigated. Optimum formula was obtained. It is found that the hardness of the composite coatings after the plating and heat treatments at various temperatures were higher than that of the Ni-P alloy coatings. Chemical analysis showed that the content of TiO2 particles was 2.14mass%. XRD analysis showed that the structure of the composite coating changed from amorphous to crystalline, and nickel phosphide （Ni3P） precipitated after heat treatment at 400℃ for lh. The hardness of the composite coatings after heat treatment was as high as HV1100. The open-circuit potentials of alloy coating and composite coating in 3.5% NaCl were close and higher than that of the substrate Fe.
出处
《腐蚀与防护》
CAS
北大核心
2006年第8期394-396,390,共4页
Corrosion & Protection
关键词
化学镀
镍
复合镀层
纳米颗粒
氧化钛
Electroless plating
Ni
Composite coating
Nanometer particle
Titanium oxide
