Electrodeposition and Corrosion Resistance of Ni-Mo Alloy Coating: Effect of Electroplating Bath pH Values

IF 2.9 4区材料科学 Q2 CRYSTALLOGRAPHY

Crystals Pub Date : 2026-01-11 DOI:10.3390/cryst16010051

Xi Shi, Shiyuan Zhu, Qiongyu Zhou, Bo Liang, Jun Li, Guangji Li, Longquan Chen, Peijun Xu

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引用次数: 0

Abstract

Ni-Mo alloy coating has shown exciting potential as a candidate to replace chromium coating. In this paper, Ni-Mo alloy coatings were successfully electrodeposited from a citrate/ammonia bath, and the effect of the bath pH values over a wide range (4–10) on the characteristics and corrosion resistance of Ni-Mo alloy coating was studied in detail. Results show that all the deposited Ni-Mo alloy coatings consist of a crystalline solid-solution Ni(Mo) fcc structure. An increase in bath pH values could facilitate the deposition of Mo, thereby increasing the Mo content and decreasing the crystallite size of Ni-Mo alloy coatings. However, there are subtle gaps between the coarse grains on the surface of the Ni-Mo alloy coating deposited at pH 10. These subtle gaps tend to form between the coarse grains on the surface of the electrodeposited Ni-Mo alloy coating because of the relatively high Mo content, refined grains, and appropriate morphology. The Ni-Mo alloy coating deposited at pH 9 exhibits optimal corrosion resistance, attributed to its lowest corrosion current density icorr (7.31 × 10−6 A cm−2), the strongest polarization resistance (11.13 kΩ·cm−2), and impedance value, which are mainly contributed to by the coating resistance and charge-transfer resistance.

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Ni-Mo合金镀层的电沉积及耐蚀性：镀液pH值的影响

镍钼合金涂层作为替代铬涂层的候选材料显示出令人兴奋的潜力。本文成功地在柠檬酸/氨液中电沉积了Ni-Mo合金镀层，并详细研究了在较宽范围内（4-10）电镀液pH值对Ni-Mo合金镀层性能和耐蚀性的影响。结果表明：所沉积的Ni-Mo合金镀层均为结晶固溶体Ni(Mo) fcc结构。提高镀液pH值有利于Mo的沉积，从而提高Mo含量，减小Ni-Mo合金镀层的晶粒尺寸。然而，在pH值为10时沉积的Ni-Mo合金涂层表面的粗晶粒之间存在细微的间隙。由于镍钼合金镀层中Mo含量较高，晶粒细化，形貌适宜，容易在镀层表面的粗晶粒之间形成细小的间隙。在pH值为9时沉积的Ni-Mo合金镀层具有最佳的耐蚀性，腐蚀电流密度icorr最低（7.31 × 10−6 A cm−2），极化电阻最高（11.13 kΩ·cm−2），阻抗值最高（主要由镀层电阻和电荷转移电阻决定）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

4.20

自引率

11.10%

发文量

1527

审稿时长

16.12 days

期刊介绍： Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.