{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T00:19:50Z","timestamp":1791591590481,"version":"4.3.4"},"reference-count":36,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T00:00:00Z","timestamp":1780272000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100013282","name":"National Magnetic Confinement Fusion Program of China","doi-asserted-by":"publisher","award":["2024YFE03260100"],"award-info":[{"award-number":["2024YFE03260100"]}],"id":[{"id":"10.13039\/501100013282","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12305307"],"award-info":[{"award-number":["12305307"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12275224"],"award-info":[{"award-number":["12275224"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["12305307"],"award-info":[{"award-number":["12305307"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"award":["12275224"],"award-info":[{"award-number":["12275224"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010822","name":"Chengdu Science and Technology Bureau","doi-asserted-by":"publisher","award":["2025-YF08-00207-GX"],"award-info":[{"award-number":["2025-YF08-00207-GX"]}],"id":[{"id":"10.13039\/501100010822","id-type":"DOI","asserted-by":"publisher"}]},{"award":["2025-YF08-00207-GX"],"award-info":[{"award-number":["2025-YF08-00207-GX"]}],"id":[{"id":"https:\/\/ror.org\/00xfea068","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Sichuan Science and Technology Program","award":["2023YFG0078"],"award-info":[{"award-number":["2023YFG0078"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Three WC-10Co-4Cr coatings with different WC grain sizes were prepared by high-velocity air-fuel (HVAF) spraying. The corrosion behaviors were systematically evaluated in 0.2 mol\/L H2SO4 and 0.4 mol\/L HNO3 solutions through immersion tests and electrochemical measurements. The results reveal that WC grain size governs coating microstructural integrity, mechanical properties, and corrosion resistance. Among the three coatings, the medium-grained (MG) coating exhibits an optimized balance between compact microstructure, high microhardness, superior fracture toughness, and the best corrosion resistance in both acidic environments. The coarse-grained (CG) coating exhibits the worst corrosion resistance owing to its wide grain boundaries and high porosity, while the fine-grained (FG) coating is similarly compromised by slightly higher porosity and residual stress-induced microcrack networks that facilitate electrolyte penetration. The corrosion proceeds via preferential dissolution of Co in the CoCr binder phase driven by micro-galvanic coupling with WC, followed by WC particle detachment and pit formation. In a 0.4 mol\/L HNO3 solution, the strong oxidizing nature accelerates both binder dissolution and direct WC oxidation.<\/jats:p>","DOI":"10.3390\/ma19112343","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T15:07:52Z","timestamp":1780326472000},"page":"2343","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Corrosion Behavior of HVAF-Sprayed WC-10Co-4Cr Coatings in H2SO4 and HNO3 Environments"],"prefix":"10.3390","volume":"19","author":[{"given":"Yanli","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2138-9249","authenticated-orcid":false,"given":"Weicai","family":"Wan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9023-258X","authenticated-orcid":false,"given":"Mengxia","family":"Liang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shengyun","family":"Xiao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiupeng","family":"Song","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials and Surface Technology (Ministry of Education), School of Materials Science and Engineering, Xihua University, Chengdu 610039, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kunyang","family":"Fan","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Chengdu University, Chengdu 610106, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"124918","DOI":"10.1016\/j.surfcoat.2019.124918","article-title":"WC10Co4Cr coatings deposited by HVOF on martensitic stainless steel for use in hydraulic turbines: Resistance to corrosion and slurry erosion","volume":"377","author":"Ludwig","year":"2019","journal-title":"Surf. 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