Electroless Ni-P Plating on AZ91D Magnesium Alloy with a New Homogenization Pretreatment

Q4 Chemical Engineering

腐蚀科学与防护技术 Pub Date : 2014-07-29 DOI:10.11903/1002.6495.2013.256

Can Sun, Xingwu Guo, Shaohua Wang, W. Ding

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引用次数: 0

Abstract

A new environment-friendly homogenization pretreatment process was adopted for the electroless nickel plating on AZ91D magnesium alloy. Then, the morphologies, chemical composition and microstructure of the pretreated layer and the formed Ni-P coating were studied using scanning electronic microscopy(SEM), energy-dispersive X-ray spectroscopy(EDS) and X-ray diffraction spectroscopy(XRD). It was indicated that a dense Zn film formed on the substrate surface after the homogenization pretreatment, due to the selective removal of β phase during the processing.As the result, the subsequently formed Ni-P coating was uniform, compact and defect-free with P content around 7.0%, which was characterized as an amorphous matter by XRD. Potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) tests revealed that the Ni-P coating could significantly improve the corrosion resistance of AZ91D magnesium alloy with an obvious positive shifting of corrosion potential by 1.136 V and a dramatic reduce of corrosion current density by two orders of magnitude. Furthermore the obtained Ni-P coating showed excellent adhesion to AZ91D substrate.

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AZ91D镁合金化学镀Ni-P的均匀化预处理方法

采用一种新的环保型均质预处理工艺对AZ91D镁合金进行化学镀镍。利用扫描电子显微镜(SEM)、能谱仪(EDS)和x射线衍射仪(XRD)研究了预处理层和形成的Ni-P涂层的形貌、化学成分和微观结构。结果表明，均匀化预处理后，基体表面形成致密的Zn膜，这是由于加工过程中β相的选择性去除所致。结果表明，制备的Ni-P涂层均匀致密，无缺陷，P含量在7.0%左右，经XRD表征为非晶态物质。动电位极化和电化学阻抗谱(EIS)测试表明，Ni-P涂层能显著提高AZ91D镁合金的耐蚀性，腐蚀电位显著正移1.136 V，腐蚀电流密度显著降低2个数量级。制备的Ni-P涂层对AZ91D基体具有良好的附着力。

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来源期刊

腐蚀科学与防护技术 Chemical Engineering-Chemical Engineering (all)

CiteScore

0.60

自引率

0.00%

发文量

2399

期刊介绍： Corrosion Science and Protection Technology is approved by the General Administration of Press and Publication of the State Council, the Chinese Academy of Sciences, the Chinese Academy of Sciences Institute of Metals organized by the domestic and international public circulation of national periodicals metal surface treatment academic journals. The journal is a professional and technical publication. It reports the scientific and technological achievements in the field of metal corrosion and protection, and publishes research reports, reviews, technical reports, research briefs, failure analysis, experience exchange, etc. The readers are engaged in the field of metal corrosion and protection. The target readers are scientific and technological personnel engaged in metal corrosion and protection and teachers and students of related professional colleges and universities. Corrosion Science and Protection Technology is indexed in CSCD, CSTPCD, CA,MA,SA and other authoritative databases.