镍/铜/锌多层镀层的制备及其耐蚀性
Preparation and Corrosion Resistance of Ni/Cu/Zn Multilayer Coating
摘 要
采用电沉积法在低碳钢基体上制备了镍/铜/锌多层镀层。采用扫描电镜观察镍/铜/锌多层镀层的微观结构；通过盐水（NaCl质量分数为5%）浸泡试验对制得的镍/铜/锌多层镀层进行耐蚀性评价；利用电化学阻抗谱（EIS）技术测试镍/铜/锌多层镀层在5% NaCl（质量分数）溶液中的电化学性能。结果表明：底层镍镀层颗粒以四角锥型交错堆积，中间层铜镀层颗粒以圆胞型结构沉积，表层锌镀层的表面平整致密，无明显孔隙；镍/铜/锌多层镀层具有较好的耐蚀性，电化学阻抗达到了5 623 Ω·cm2，耐盐水浸泡时间可达2 880 h时，是相同厚度单一镀层耐盐水浸泡时间的5~8倍。
多层镀层
耐蚀性
盐水浸泡试验
电化学阻抗谱
electrodeposition
multilayer coating
corrosion resistance
brine immersion test
electrochemical impedance spectroscopy (EIS)
Abstract
Ni/Cu/Zn multilayer coating was prepared on low carbon steel substrate by electrodeposition. The microstructure of the Ni/Cu/Zn multilayer coating was observed by scanning electron microscopy (SEM). The corrosion resistance of the Ni/Cu/Zn multilayer coating was evaluated by the brine immersion testing in which NaCl mass fraction was 5%. The electrochemical properties of Ni/Cu/Zn multilayer coating in 5.0% (mass) NaCl solution were measured by electrochemical impedance spectroscopy (EIS) technique. The results show that:the particles in the under layer of nickel were stacked interlacedly as four pyramid type, the particles in the middle layer of copper were deposited by round cell structure, and the surface layer of zinc was flat and compact without apparent pores. The Ni/Cu/Zn multilayer coating exhibited good corrosion resistance, showing a value of electrochemical impedance of 5 623 Ω·cm2. The immersion time of red rust spot occurring on the coating surface in brine reached 2 880 h which was 5-8 times of that for single layer coating with the same thickness.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201712006
所属栏目 试验研究
基金项目 南通市产学研协同创新计划项目（BC2014010）；上海市钢铁冶金新技术开发应用重点实验室开放课题基金资助（SELF-2015-01）
收稿日期 2016/4/6
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引用该论文: SUN Jinhu,LI Hui,ZHONG Qingdong,HUANG Zherui,LI Yulin. Preparation and Corrosion Resistance of Ni/Cu/Zn Multilayer Coating[J]. Corrosion & Protection, 2017, 38(12): 928
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【9】WANG H,XIE G Y,YING Z,et al. Enhanced mechanical properties of multi-layer graphene filled poly(vinyl chloride) composite films[J]. Journal of Materials Science & Technology,2015,31:340-344.
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