AZ31镁合金表面化学镀镍工艺研究.pdf

2 1 4 腐蚀科学与防护技术 V o.l 2 1 N o. 4 2009 7 CORROSION SCIENCE AND PROTECTION TECHNOLOGY Jul. 2009 AZ31 石西昌, 杨慧兰, 肖湘, 徐徽, 陈白珍, 杨喜云 , 410083 : AZ 31, , 25 g /L N SO 6H O 4 2 25 g / L 15 g / L 10 g / L NH F1 m g / L . 85 pH = 90 1 4 A Z31N P, 10 m. SEMXRD EDS ; 35% N aC l T afe l. , N P A Z31. : AZ3 1; ; N P; : TG1744 : A : 2009) 040 37004 ELECTROLESS NICKEL PLATING ON AZ31MAGNESIUM ALLOY SURFACE SH I X chang, YANG H u lan, X IAO X ang, XU H u , CH EN Ba zhen, YANG X yun School of M etallurg ical Sc ience and E ng ineering, Central South Un iv ersity, Chang sha 4100 83 Abstract: It w as stud ed that the process of d rect electro less plat ng on the surface of AZ31 m agnes um alloy. T he optm um fo rm ula o f the bath s N SO 6H O 25 g /L, N aH PO H O 25 g /L, c tr c ac d 15 4 2 2 2 2 g /L, NH F 10 g /L and th ourea 1 m g /L. T he good electro less plated coat ng cons sted o f N P w as ob 4 ta ned n the bath w th pH = 90 at 85 fo r 1 hour. T he th ckness of the electro less p lat ng s m ore than 10 m. T he m orpho logy of the n ckelphosphoru s coat ng w as stud ed u s ng SEM. Its phase const tuen t and com pos t on w ere exam ned by XRD and ED S. T he corros on behav or of the n ckelphosphoru s coat ng w as stud ed by T afel polar zat on n a 35% N aC l so lut on. T he results show ed that n ckelphosphoru s coat ngs had a s gn f cantly better corros on res stance than AZ31. K e