热处理温度对镍–磷–石墨烯复合镀层性能的影响

Effect of heat treatment temperature on properties of nickel–phosphorus–graphene composite coating

在45钢上进行镍–磷–石墨烯化学复合镀,并在不同温度下对镀层热处理1 h。利用扫描电镜、X射线衍射仪分析了经不同温度热处理后复合镀层的表面形貌和结构,采用多功能材料表面性能测试仪对其摩擦磨损行为进行研究,利用塔菲尔曲线和电化学阻抗谱技术研究了它们在3.5% NaCl溶液中的电化学腐蚀行为。结果表明,镀态镍–磷–石墨烯复合镀层是非晶结构,随热处理温度升高,复合镀层逐渐转变为晶态结构,耐磨性改善,但热处理温度高于300℃时耐蚀性反而变差。

Nickel-phosphorus-graphene composite coating was prepared on 45 steel by electroless plating followed by heat treatment at different temperatures for 1 h. The surface morphologies and microstructures of the composite coatings subjected to heat treatment at different tempratures were analyzed using scanning electron microscope and X-ray diffractometer, respectively. The friction and wear behavior of the composite coatings was studied by using a multifunctional material surface properties tester. The electrochemical corrosion behavior of each composite coating in 3.5% NaC1 solution was examined by Tafel curve measurement and electrochemical impedance spectroscopy. The results showed that the as-plated Ni-P-graphene composite coating is amorphous. The composite coating gradually transfers to be crystalline with the increasing of heat treatment temperature, and its wear resistance is improved. However, its corrosion resistance deteriorates after being heat treated at a temperature higher than 300℃.