Comparative Study on the Microstructure and Properties of 304 Stainless Steel Coatings Prepared by High-Velocity Oxygen Fuel Spraying and Air Plasma Spraying

IF 3.2 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Journal of Thermal Spray Technology Pub Date : 2024-05-20 DOI:10.1007/s11666-024-01786-4

Ting Zhang, Wensheng Li, Hao Hong, Lei Shao, Xinyi Zhang, Haimin Zhai

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Abstract

The 304 stainless steel coatings were applied to a 6061-T6 aluminum alloy substrate using high-velocity oxygen fuel spraying (HVOF) and air plasma spraying (APS) techniques. The objective of this study was to investigate the microstructure, hardness, tribological, and corrosion properties of the coatings produced by these two different processes. The findings revealed a clear relationship between the molten state of particles and the porosity, oxygen content, and microstructure of the stainless steel coatings. It was observed that the HVOF coating had higher quantities of austenite and martensitic, while the APS coating exhibited an increased presence of ferrite. These distinctions were directly responsible for the enhanced hardness and improved wear resistance observed in the HVOF coating. More specifically, the HVOF coating demonstrated a twofold increase in hardness (493.2 Hv_0.1) compared to the APS coating. Its wear resistance was also significantly improved, with a sevenfold increase (0.36 × 10⁻⁴ mm³ N⁻¹ m⁻¹). Electrochemical tests were performed in a 3.5 wt.% aCl solution to assess the corrosion behavior of the coatings. The results clearly indicated that the HVOF coating provided superior corrosion protection compared to the APS coating.

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高速氧气燃料喷涂和空气等离子喷涂制备的 304 不锈钢涂层的微观结构和性能对比研究

使用高速氧气燃料喷涂（HVOF）和空气等离子喷涂（APS）技术将 304 不锈钢涂层喷涂到 6061-T6 铝合金基体上。本研究的目的是调查这两种不同工艺生产的涂层的微观结构、硬度、摩擦学和腐蚀特性。研究结果表明，颗粒的熔融状态与不锈钢涂层的孔隙率、含氧量和微观结构之间存在明显的关系。据观察，HVOF 涂层中奥氏体和马氏体含量较高，而 APS 涂层中铁素体含量较高。这些区别直接导致了 HVOF 涂层硬度的提高和耐磨性的改善。更具体地说，与 APS 涂层相比，HVOF 涂层的硬度提高了两倍（493.2 Hv0.1）。其耐磨性也得到了明显改善，提高了七倍（0.36 × 10-4 mm3 N-1 m-1）。在 3.5 wt.% aCl 溶液中进行了电化学测试，以评估涂层的腐蚀行为。结果清楚地表明，与 APS 涂层相比，HVOF 涂层能提供更好的腐蚀保护。

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来源期刊

Journal of Thermal Spray Technology 工程技术-材料科学：膜

CiteScore

5.20

自引率

25.80%

发文量

198

审稿时长

2.6 months

期刊介绍： From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.