摘要
Ni-P/纳米TiO2颗粒复合镀层可在提高硬度的同时增强镁合金的耐腐蚀性。本工作以硫酸镍为主盐对镁合金进行了纳米TiO2/Ni-P复合镀,并用金相法、扫描电镜(SEM)、X射线能谱(EDS)、动电位扫描等手段研究了其性能,并优化了施镀条件。结果表明,以硫酸镍为主盐可在镁合金基底上制得致密、厚度均匀、与基体结合良好的纳米TiO2/Ni-P复合镀层;复合镀层的硬度比无纳米合金镀层显著提高,但纳米颗粒加入量超过2g/L后镀层表面硬度几乎不再随加入量变化;复合镀层和合金镀层的耐腐蚀性都比基底镁合金高得多;纳米复合镀可提高镍磷合金镀层在3.5%NaCl溶液中的耐蚀性,而加入过多的纳米颗粒可以使复合镀层的耐蚀性降低。
Magnesium alloy has already been used more and more widely. Its protection technology has become a hard task and hotspot. Nickel/nano particle composite coating may promote its hardness and corrosion resistance simultaneously, nano-TiO2/Ni-P alloy composite coating was prepared on magnesium alloy substrate with nickel sulphate as the main salt. The methods of metallograph, SEM, EDS, dynamic potential scanning were applied to test the properties, and the coating conditions were optimized. By using the main salt of nickel sulphate, the nano-TiO2/Ni-P alloy composite coating with condensation, homogeneous thickness and good cohesion could be obtained on the magnesium alloy substrate. The hardness of the composite coating was obviously higher than that of the alloy coating, but the hardness of the composite coating would no longer increase with the adding of the nano particle when the particle was over adding. The corrosion resistances of both the composite coating and the alloy coating were much higher than that of the substrate magnesium alloy. Nano particle composite coating could promote the corrosion resistance of the Ni-P alloy coating in 3.5%NaCl solution, but the over adding of nano particle might decrease the corrosion resistance of the composite coating.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第12期29-32,共4页
Materials Protection
