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镁合金镀镍磷合金及无铬前处理工艺
引用本文:牛丽媛,李光玉,江中浩,孙丽萍,韩冬,连建设.镁合金镀镍磷合金及无铬前处理工艺[J].吉林大学学报(工学版),2006,36(2):148-0152.
作者姓名:牛丽媛  李光玉  江中浩  孙丽萍  韩冬  连建设
作者单位:吉林大学,汽车材料教育部重点实验室,长春,130022
摘    要:AZ91D镁合金首先在无铬的磷酸盐溶液中磷化,然后在硫酸盐镀液中镀镍磷合金。用SEM和XRD对磷化膜的化学组成及微观结构进行了表征,探讨了磷化膜及镍磷合金镀层的形成机理。结果表明:磷化膜主要由Zn3(PO4)2.4H2O和单质锌组成,金属锌粒子作为进一步镀镍磷合金的形核催化剂;磷化液中的间硝基苯磺酸钠使磷化膜的一部分微阳极区变为微阴极区,增加了磷化膜的成膜速度并细化了磷化膜结晶;在含4.0 g/L间硝基苯磺酸钠的磷化液中得到的磷化膜上沉积的镍磷合金镀层致密均匀,有较高的耐蚀性,镀层的附着强度符合ISO 2819的要求。

关 键 词:材料失效与保护  镁合金  磷化  化学镀  Ni-P合金  耐腐蚀
文章编号:1671-5497(2006)02-0148-05
收稿时间:2005-07-05
修稿时间:2005年7月5日

Ni-P deposits and non-chromate pretreatment technology on magnesium alloy
Niu Li-yuan,Li Guang-yu,Jiang Zhong-hao,Sun Li-ping,Han Dong,Lian Jian-she.Ni-P deposits and non-chromate pretreatment technology on magnesium alloy[J].Journal of Jilin University:Eng and Technol Ed,2006,36(2):148-0152.
Authors:Niu Li-yuan  Li Guang-yu  Jiang Zhong-hao  Sun Li-ping  Han Dong  Lian Jian-she
Affiliation:Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130022, China
Abstract:AZ91D Magnesium alloy samples were pretreated in zinc phosphating bath,and then were plated Ni-P deposits from the bath containing nickel sulphate.The microstructure of the phosphate coatings were observed using scanning electron mioroscopy(SEM) and the phase composition were analyzed by Xray diffractometer(XRD).The formation mechanisms of the phosphate coating and the Ni-P deposit were investigated.Result shows that chief compositions of the phosphate coating were Zn_3(PO_4)_2·4H_2O and Zn.Metal zinc crystals become the catalytic particles of the nickel deposition.The sodium metanitrobenzene sulphonate in the phosphating bath increases the micro cathode areas of the phosphate coating and accelerates the formation of the phosphate coating.It was proved that electroless Ni-P deposits onto the phosphate coating obtained from the zinc phosphating bath containing(4.0 g/L sodium)metanitrobenzene sulphonate are denser and has better anticorrosion performance.The adhesion of the electroless Ni-P deposits satisfies the requirement of ISO 2819.
Keywords:materials failure and protection  magnesium alloy  phosphating  electroless Ni-P deposits  anticorrosion
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