镀液pH值对电沉积Ni-W合金镀层结构及其耐蚀性能的影响

doi:10.11902/1005.4537.2016.071

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 457-462 DOI: 10.11902/1005.4537.2016.071

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镀液pH值对电沉积Ni-W合金镀层结构及其耐蚀性能的影响

周琼宇^1,²,王小芬¹(

),钟庆东²,王操¹,胡一峰¹

1. 江西理工大学材料科学与工程学院赣州 341000
2. 上海大学上海市现代冶金与材料制备重点实验室上海 200072

Effect of pH Value on Structure and Corrosion Resistance of Electrodeposited Ni-W Alloy Coating

Qiongyu ZHOU^1,²,Xiaofen WANG¹(

),Qingdong ZHONG²,Cao WANG¹,Yifeng HU¹

1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Shanghai Key Laboratory of Modern Metallurgy and Material Processing, Shanghai University, Shanghai 200072, China

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摘要:

采用直流电沉积的方法在低碳钢表面制备了一层Ni-W合金镀层,研究了pH值对电沉积Ni-W合金镀层结构及其耐蚀性能的影响。结果表明：在硫酸盐-柠檬酸镀液体系中可直接沉积一层均匀致密的Ni-W合金层,pH值小于7的镀液沉积得到纳米晶结构的Ni-W镀层;pH值大于7时,镀层为非晶态结构。Ni-W合金层的硬度主要由镀层中W含量所决定,镀液pH值为5.5时所沉积的Ni-W镀层中W含量最高,镀层的硬度最高 (753 HV);在3.5% (质量分数) NaCl溶液中,Ni-W合金层均表现出比低碳钢更低的电化学活性,对基体具有良好的保护作用。在所有的Ni-W合金镀层样品中,非晶态镀层由于表面易发生钝化而具有更加优异的耐蚀性能,其中镀液pH值为7.5时所沉积的镀层具有最优的耐蚀性能。

关键词 ： Ni-W合金, 镀层, 电沉积, 耐蚀性, 钝化, 电化学阻抗

Abstract：

Ni-W alloy coating was electrodeposited on low-carbon steel from an aqueous citrate-sulphate,while the effect of pH value on surface state, structure and corrosion resistance of the Ni-W alloy coatings was investigated. The result shows that: nanocrystalline Ni-W alloy coatings were produced when pH<7, while amorphous Ni-W alloy coatings were electrodeposited when pH>7. The hardness of Ni-W alloy coatings is correlated with the W content in the alloy coating. In contrast with low-carbon steel, Ni-W alloy coatings show much positive corrosion potential and much lower corrosion current density. Furthermore, the amorphous Ni-W alloy coating electrodeposited by pH=7.5 shows the best corrosion resistance due to the peculiar passivity of the coating in 3.5%(mass fraction) NaCl.

Key words： Ni-W alloy coating electrodeposition corrosion resistance passive electrochemical impedance spectroscopy

基金资助:国家自然科学基金项目 (51504104),江西省自然科学基金项目 (20151BAB216012和20161BAB206141) 及江西理工大学博士启动基金项目 (3401223204) 资助

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引用本文:

周琼宇,王小芬,钟庆东,王操,胡一峰. 镀液pH值对电沉积Ni-W合金镀层结构及其耐蚀性能的影响[J]. 中国腐蚀与防护学报, 2016, 36(5): 457-462.
Qiongyu ZHOU, Xiaofen WANG, Qingdong ZHONG, Cao WANG, Yifeng HU. Effect of pH Value on Structure and Corrosion Resistance of Electrodeposited Ni-W Alloy Coating. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 457-462.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.071 或 https://www.jcscp.org/CN/Y2016/V36/I5/457

图1 不同pH值镀液中制备的Ni-W合金镀层的XRD谱

图2 镀液pH值对Ni-W合金镀层中W含量及电流效率的影响

图3 不同pH值镀液中制备的Ni-W合金镀层的表面形貌

图4 不同pH值下制备的Ni-W合金镀层的截面图

图5 Ni-W合金镀层硬度随镀液pH值及W含量的变化情况

表1 低碳钢和Ni-W合金镀层在3.5%NaCl溶液中的腐蚀电位和腐蚀电流密度拟合结果

图6 低碳钢和不同pH值镀液中所制备镀层在3.5%NaCl溶液中的极化曲线

图7 不同pH值镀液中所制备镀层在3.5%NaCl溶液中的电化学阻抗谱

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