Ni-W-P合金镀层性能研究

Study on the properties of Ni-W-P alloy coating

通过对Ni–W–P合金镀层在低温热处理前后的XRD和SEM检测得知,无论镀态还是热处理态,镀层结构均为非晶态,晶粒均匀,晶界清楚,并且热处理后晶粒长大。在硫酸和盐酸介质中的耐蚀性测试表明,除了低体积分数(5%左右)和高体积分数(20%左右)盐酸之外,热处理态的耐蚀性均高于镀态的耐蚀性。通过析氢性能测试,得知镍基合金的电催化活性依次为Ni–W–P>Ni–P>Ni–W>Ni。

The properties of Ni-W-P coatings electroplated on 45^# steel substrates were studied. The results of XRD and SEM showed that both as-plated and heat-treated coatings feature amorphous structure, uniform grain size and clear crystal boundary. Crystal grains grow up after heat treatment. The corrosion tests in H2SO4 and HC1 solutions of different volume fractions showed that the corrosion resistance of heat-treated Ni-W-P coating is better than that of as-plated one except in ca. 5% and ca. 20% HC1 solutions. Based on hydrogen evolution tests, the electrocatalytic activities of different Ni-based alloy coatings are in the following descending order： Ni-W-P 〉 NiP 〉 Ni-W 〉 Ni.