刘秋月,张修庆,浦海洲,徐金鹏.AZ91D 镁合金表面 Ni-P / Ni-Sn-P 双镀层的制备与性能研究[J].表面技术,2015,44(2):34-37,133.
LIU Qiu-yue,ZHANG Xiu-qing,PU Hai-zhou,XU Jin-peng.Study on the Preparation and Properties of Ni-P / Ni-Sn-P Duplex Coatings on AZ91D Magnesium Alloy[J].Surface Technology,2015,44(2):34-37,133 |
| AZ91D 镁合金表面 Ni-P / Ni-Sn-P 双镀层的制备与性能研究 |
| Study on the Preparation and Properties of Ni-P / Ni-Sn-P Duplex Coatings on AZ91D Magnesium Alloy |
| 投稿时间：2014-10-20 修订日期：2015-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.02.007 |
| 中文关键词: AZ91D 镁合金 Ni-P 镀层 Ni-P/ Ni-Sn-P 双镀层 耐腐蚀性能 |
| 英文关键词:AZ91D magnesium alloy Ni-P coating Ni-P / Ni-Sn-P duplex coatings corrosion resistance |
| 基金项目: |
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| Author | Institution |
| LIU Qiu-yue | School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
| ZHANG Xiu-qing | School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
| PU Hai-zhou | School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
| XU Jin-peng | School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| 中文摘要: |
| 目的 提高 AZ91D 镁合金的耐腐蚀性能,扩大其应用范围。 方法 先在 AZ91D 镁合金表面化学镀 Ni-P 镀层,再化学镀 Ni-Sn-P 镀层,形成 Ni-P/ Ni-Sn-P 双镀层。 研究 Ni-P/ Ni-Sn-P 双镀层的表面形貌和耐腐蚀性能,并与 Ni-P 单镀层进行对比。 结果 Ni-P/ Ni-Sn-P 双镀层表面分布更均匀平整,缺陷较少,孔隙率较低,具有无定形结构。 二次 Ni-Sn-P 镀层的腐蚀电位约为-0. 77 V,略低于一次化学镀 Ni-P层(约-0. 68 V),两镀层间的电位差使得其构成了微腐蚀电偶,Ni-P 层作为阴极,Ni-Sn-P 层作为阳极,阳极优先被腐蚀。 结论 Ni-P/ Ni-Sn-P 双镀层的 Ni-Sn-P 外层能为 Ni-P 内层提供阴极保护,较好地横向分散腐蚀电流,从而增强 AZ91D 镁合金基底的耐腐蚀性能。 |
| 英文摘要: |
| Objective To improve the corrosion resistance of AZ91D magnesium alloy and expand the range of application. Methods Ni-P coating was first prepared on AZ91D magnesium alloy by electroless plating, then Ni-Sn-P coating was prepared on this basis, forming Ni-P/ Ni-Sn-P duplex coatings. The microstructure and corrosion resistance of Ni-P/ Ni-Sn-P duplex coatings were investigated and compared with those of Ni-P coating. Results The results showed that the surface of Ni-P/ Ni-Sn-P duplex coatings was more uniform, compact, with fewer defects, lower porosity and amorphous structure. The corrosion potential of the secondary Ni-Sn-P coating was about -0. 77 V, which was lower than that of the first Ni-P coating ( -0. 68 V). The potential difference between the two coatings formed micro etching point, with Ni-P coating as the cathode, and Ni-Sn-P coating as the anode, and the anode was corroded first. Conclusion The outer layer of Ni-Sn-P coating in the Ni-P/ Ni-Sn-P duplex coatings could protect the first Ni-P coating from corroding and diffuse the corrosion current in the horizontal direction, thus greatly enhancing the corrosion resistance of AZ91D magnesium alloy. |
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