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Ni-P/Ni-Zn-P双层复合镀层制备及耐蚀性的研究
引用本文:赵丹,徐旭仲,刘亭亭.Ni-P/Ni-Zn-P双层复合镀层制备及耐蚀性的研究[J].表面技术,2017,46(4):240-245.
作者姓名:赵丹  徐旭仲  刘亭亭
作者单位:华北理工大学 冶金与能源学院,河北 唐山,063009;华北理工大学 冶金与能源学院,河北 唐山,063009;华北理工大学 冶金与能源学院,河北 唐山,063009
基金项目:河北省科技厅科技计划项目(15211037);华北理工大学研究生创新项目(2016S24)
摘    要:目的提高金属材料在海洋环境下的耐蚀性。方法采用化学镀方法在Q235碳钢表面施镀Ni-Zn-P合金镀层和Ni-P/Ni-Zn-P双层复合镀层,采用扫描电镜(SEM)和能谱分析仪(EDS)对镀层表面形貌和断面成分进行了分析。结果 Ni-P/Ni-Zn-P双层复合镀层相对于Ni-Zn-P合金镀层胞状组织更加均匀平滑,胞与胞的边界结合更加连续致密。Ni-Zn-P合金镀层断面厚度为6.5μm左右,锌和磷的质量分数分别约为4%和14%。Ni-P/Ni-Zn-P双层复合镀层断面总厚度约7.5μm,内层镀层的厚度约2.3μm,磷的质量分数约为9%;外层镀层厚度约5.2μm,锌和磷的质量分数分别约为5%和11%。在5%Na Cl溶液中腐蚀144 h后,Ni-Zn-P合金镀层遭到了严重的破坏,有许多裂纹,而Ni-P/Ni-Zn-P双层复合镀层仍然连续完整,没有严重的破损,只是局部腐蚀,这说明双层镀层更耐蚀。结论 Ni-P/Ni-Zn-P双层复合镀层腐蚀速率明显低于Ni-Zn-P合金镀层,相对于Ni-Zn-P合金镀层耐蚀性更好。

关 键 词:Ni-P/Ni-Zn-P双层复合镀层  Ni-Zn-P合金镀层  化学镀  耐蚀性
收稿时间:2016/10/12 0:00:00
修稿时间:2017/4/20 0:00:00

Preparation and Corrosion Resistance of Bilayered Ni-P/Ni-Zn-P Composite Coating
ZHAO Dan,XU Xu-zhong and LIU Ting-ting.Preparation and Corrosion Resistance of Bilayered Ni-P/Ni-Zn-P Composite Coating[J].Surface Technology,2017,46(4):240-245.
Authors:ZHAO Dan  XU Xu-zhong and LIU Ting-ting
Affiliation:School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China,School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China and School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China
Abstract:The work aims to improve corrosion resistance of metal materials in marine environment. Ni-Zn-P alloy coating and Ni-P/Ni-Zn-P bilayered composite coating were prepared on Q235 steel by virtue of chemical plating. Surface morphology and fracture surface of the coatings were analyzed with SEM and EDS. The Ni-P/Ni-Zn-P bilayered composite coating was more uniform and smooth than Ni-Zn-P alloy coating, and the cell boundary was more continuous and dense as well. Cross sec-tion thickness of Ni-Zn-P alloy coating was about 6.5μm, and Zn and P mass fraction nearly 4% and 14% respectively. Overall thickness of Ni-P/Ni-Zn-P bilayered composite coating was about 7.5μm, thickness of inner coating about 2.3μm, P mass frac-tion about 9%; the outer coating about 5.2μm, Zn and P mass fraction of about 5% and 11% respectively. After being corroded for 144h in 5% solution, the Ni-Zn-P alloy coating was severely damaged and many cracks were present. The Ni-P/Ni-Zn-P bi-layered composite coating remained intact and was subject to localized corrosion instead of serious damage, indicating that the bilayered coating was more resistant to corrosion. Corrosion rate of Ni-P Ni-Zn-P bilayered coating was significantly lower than that of Ni-Zn-P alloy coating, corrosion resistance of the former was better as well.
Keywords:Ni-P/Ni-Zn-P bilayered coating  Ni-Zn-P alloy coating  chemical plating  corrosion resistance
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