冷喷涂制备TC4-WC涂层的组织及腐蚀性能分析

doi:10.11902/1005.4537.2025.088

中国腐蚀与防护学报 DOI: 10.11902/1005.4537.2025.088

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冷喷涂制备TC4-WC涂层的组织及腐蚀性能分析

于宝义,梅桐,郑黎,常东旭,吉梅琳

沈阳工业大学

Microstructure and Corrosion Performance Analysis of TC4-WC Coatings Fabricated by Cold Spraying

引用本文:

于宝义梅桐郑黎常东旭吉梅琳. 冷喷涂制备TC4-WC涂层的组织及腐蚀性能分析[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2025.088.

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摘要: 冷喷涂TC4涂层存在较多孔洞，涂层防腐蚀性能较差。为提升涂层耐腐蚀性能，本文在TC4粉末中加入不同体积含量的WC颗粒（15 vol. %-30 vol. %），探究WC含量对冷喷涂TC4涂层的组织形貌的影响。采用电化学和盐雾腐蚀实验探究TC4和TC4-WC涂层在海水中的腐蚀行为。结果表明：WC颗粒的机械嵌合作用可有效降低涂层孔隙率，且当WC含量为25 vol. %时，涂层孔隙率由TC4涂层的10.573%显著降低至0.464%，此时复合涂层表现出更加优异的耐腐蚀性能。TC4涂层的主要腐蚀机制为缝隙腐蚀，WC的加入使TC4涂层更加致密，能有效阻止腐蚀介质的渗入，对基板起到良好的防护作用。

关键词 ： TC4, WC, 冷喷涂, 动电位极化, 盐雾腐蚀

Abstract：The cold-sprayed TC4 coating exhibits a high porosity, leading to poor corrosion resistance. To enhance the corrosion resistance, this study introduced WC particles with varying volume fractions (15 vol.%–30 vol.%) into TC4 powder to investigate the influence of WC content on the microstructure of cold-sprayed TC4 coatings. The corrosion behavior of TC4 and TC4-WC coatings in seawater was evaluated through electrochemical and salt spray corrosion tests. The results indicate that the mechanical interlocking effect of WC particles effectively reduces coating porosity. When the WC content reaches 25 vol.%, the porosity of the composite coating decreases significantly from 10.573% (pure TC4 coating) to 0.464%, demonstrating superior corrosion resistance. Electrochemical tests reveal that the optimal composite coating (TC4-25 vol.%WC) exhibits a corrosion current density in 3.5 wt.% NaCl solution that is three orders of magnitude lower than that of the substrate. Microscopic analysis from electrochemical and salt spray corrosion tests shows that WC particles promote the formation of a dense TC4 matrix through plastic deformation effects, while their inherent hardness effectively blocks the penetration pathways of corrosive media. Corrosion mechanism analysis confirms that the failure of the original TC4 coating originates from crevice corrosion induced by pores, whereas the incorporation of WC significantly inhibits the penetration of corrosive media toward the substrate interface. This study provides both theoretical and technical foundations for the development of high-performance titanium-based composite protective coatings.

Key words： TC4 WC cold spray potentiodynamic polarization salt spray corrosion

收稿日期: 2025-03-16

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