Na2MoO4添加量对Ni-Mo-P合金镀层微观组织及耐腐蚀性能的影响  

Influence of NaMoO Addition on Microstructure and Corrosion Resistance of Ni-Mo-P Alloy Coatings

作　　者：马敏 孙万昌[1] 刘晓佳 张磊[2] 张亚刚 田莎莎 刘豫皖 MA Min;SUN Wanchang;LIU Xiaojia;ZHANG Lei;ZHANG Yagang;TIAN Shasha;LIU Yuwan(College of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;CSIC No.12 Research Institute,Xingping 713102,China)

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054 [2]中国船舶重工集团公司第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2021年第6期106-110,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(50172023);陕西省重点研究发展项目(2020GY-115);陕西省科技攻关项目(2014K08-09);榆林市产学研科技计划项目(2012);陕西省教育厅专项计划资助项目(11JK0824)。

摘　　要：采用化学镀技术在镁合金基体表面制备了Ni-Mo-P合金镀层,研究了Na2MoO4添加量对Ni-Mo-P镀层的微观组织、成分及耐蚀性的影响。利用扫描电镜观察了Ni-Mo-P镀层的表面和截面形貌,借助电化学工作站测试了Ni-Mo-P镀层在3.5wt%NaCl溶液中的极化曲线及阻抗谱。结果表明:Ni-Mo-P合金镀层表面形貌为胞状结构,当Na2MoO4添加量为0.5 g/L时,Ni-Mo-P合金镀层的胞状结构更细小,组织更紧密。0.5 g/L Na2MoO4添加量获得的Ni-Mo-P合金镀层的自腐蚀电位最正,为-0.8273 V,自腐蚀电流最小,为2.3041×10-6A/cm2,容抗弧半径达到最大,耐蚀性最佳。Ni-Mo-P alloy coatings on the magnesium alloy surface were prepared by electroless plating technology. The effects of Na2MoO4 addition on the microstructure, composition and corrosion resistance of Ni-Mo-P coating were studied.The surface and cross-section morphologies of Ni-Mo-P coating were observed by SEM. The polarization curve and impedance spectrum of Ni-Mo-P coating were measured by electrochemical method in 3.5 wt% NaCl solution. The results show that the surface morphology of Ni-Mo-P alloy coating is cellular structure. When the addition of Na2MoO4 is 0.5 g/L, the cellular structure of Ni-Mo-P alloy coating is finest and the microstructure is compact. The self-corrosion potential of Ni-Mo-P alloy coating obtained by adding 0.5 g/L Na2MoO4 is the most positive, which is-0.8273 V, and the self-corrosion current is smallest, which is 2.3041×10-6 A/cm2. The capacitive arc radius reaches the maximum and the corrosion resistance is best.

关 键 词：AZ91D镁合金 Ni-Mo-P合金镀层 化学镀 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]