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Corrosion Behavior of Ni–Mo Coatings Prepared by Different Electrodeposition Methods in Na2S Solution

  • ELECTROCHEMISTRY. GENERATION AND STORAGE OF ENERGY FROM RENEWABLE SOURCES
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Abstract

To enhance the corrosion resistance of pure aluminum in sulfur-containing environments, Ni–Mo coatings were deposited on aluminum substrates via direct current (DC) and pulse current (PC) electrodeposition techniques. The phase structure, micromorphology and element composition of the coatings were characterized by XRD, SEM, and EDS. The corrosion resistance of pure aluminum and Ni–Mo coatings in 1 wt % Na2S aqueous solution were studied by static corrosion immersion and electrochemical test. The results indicated that aluminum suffered severe corrosion in Na2S aqueous solution, leading to the formation of Al(OH)3. The application of Ni–Mo coatings effectively prevented direct contact between the solution and the aluminum substrate. Compared with the coating prepared by DC electrodeposition under the same conditions, the Ni–Mo coating obtained through PC electrodeposition exhibited finer grains, a more compact and flatter surface, and higher Mo content, the impedance value was 15.61 kΩ cm2 and its corrosion current density was 9.610 × 10–6 A/cm2. The corrosion current density of the coating prepared by DC electrodeposition was 1.514 × 10–5 A/cm2, whereas that of pure aluminum in the same medium was 3.030 × 10–3 A/cm2.

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Funding

This work was supported by the National Natural Science Foundation of China no. 1 under grant no. 21203095; the Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) no. 2; and the Priority Academic Program Development of Jiangsu Higher Education Institutions no. 3.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, 211800, Nanjing, Jiangsu, China

    Xu Li, Zengzeng Zheng, Xujie Xiao, Jingkang Chen & Chengfei Zhu

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  1. Xu Li
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  2. Zengzeng Zheng
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  3. Xujie Xiao
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  4. Jingkang Chen
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Contributions

Xu Li: conceptualization, writing—review and editing, methodology. Zengzeng Zheng: investigation, writing—original draft. Xujie Xiao: data curation, resources. Jingkang Chen: validation visualization, software. Chengfei Zhu: writing—review and editing, funding acquisition.

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Correspondence to Chengfei Zhu.

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Li, X., Zheng, Z., Xiao, X. et al. Corrosion Behavior of Ni–Mo Coatings Prepared by Different Electrodeposition Methods in Na2S Solution. Russ. J. Phys. Chem. 97, 2846–2854 (2023). https://doi.org/10.1134/S0036024423120300

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