镁合金化学镀镍-磷合金溶液的优化与镀层性能

发布时间：2018-07-20 09:54

【摘要】：为了开发出对镁合金腐蚀性小的化学镀镍-磷合金溶液,以氢氧化镍作为镍离子的提供者,避免SO~(2-)_4,Cl~-,NO~-_3等对镁合金基体的腐蚀;在镀液中加入了适量的植酸缓蚀剂,以进一步减轻镀液对镁合金的腐蚀。先研究了镍盐浓度、植酸浓度、工作条件(温度与pH值)单因素对镀速和镀层孔隙率的影响,再用正交试验法优化了镀液组成及施镀工艺条件;采用周期试验法估算了镀液的使用周期(MTO)。分别采用扫描电子显微镜(SEM)、电化学工作站和锉刀、热震法测试了镍-磷合金镀层的形貌、耐蚀性和结合力。结果表明:在优化镀液和施镀工艺参数下,镍-磷合金镀层完整均匀,耐蚀性能良好,且与基体结合牢固;在合理的补加条件下MTO可达4。
[Abstract]:In order to develop electroless Ni-P alloy solution with less corrosive effect on magnesium alloy, nickel hydroxide was used as the provider of nickel ion to avoid the corrosion of magnesium alloy matrix caused by so ~ (2-) ~ (2-) ~ (4-) Cl-NO _ (-O _ 3), and a proper amount of phytic acid inhibitor was added to the bath. In order to further reduce the corrosion of magnesium alloy. The effects of nickel salt concentration, phytic acid concentration, working conditions (temperature and pH value) on the plating speed and the porosity of the coating were studied. Then, the composition of the plating solution and the plating process conditions were optimized by orthogonal test. The life cycle (MTO) of plating bath was estimated by periodic test method. The morphology, corrosion resistance and adhesion of Ni-P alloy coating were measured by scanning electron microscope (SEM), electrochemical workstation and file respectively. The results show that the Ni-P alloy coating is complete and uniform, good corrosion resistance and strong bonding with the substrate under optimized plating bath and plating process parameters, and MTO can reach 4 under reasonable addition conditions.
【作者单位】：重庆文理学院新材料技术研究院;沈阳理工大学环境与化学工程学院;
【基金】：重庆文理学院人才引进项目(R2014CJ05) 重庆市教委科学技术研究项目(KJ1501116)资助
【分类号】：TG174.4

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