{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T01:46:12Z","timestamp":1783129572137,"version":"3.54.6"},"reference-count":44,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T00:00:00Z","timestamp":1772668800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["62473216"],"award-info":[{"award-number":["62473216"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100016806","name":"Natural Science Foundation of Nantong City","doi-asserted-by":"crossref","award":["JC2023060"],"award-info":[{"award-number":["JC2023060"]}],"id":[{"id":"10.13039\/100016806","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100016806","name":"Natural Science Foundation of Nantong City","doi-asserted-by":"crossref","award":["JC2023079"],"award-info":[{"award-number":["JC2023079"]}],"id":[{"id":"10.13039\/100016806","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Foundation of National Key Laboratory for Remanufacturing","award":["61420052023WD002"],"award-info":[{"award-number":["61420052023WD002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>This study investigates the influence of H13 steel substrate surface roughness on the corrosion behavior of CrAlN coatings in a 3.5 wt.% NaCl solution. The interfacial structure of the coatings and the evolution of corrosion products were characterized using electrochemical techniques, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Results indicate that reducing the substrate surface roughness from 0.235 \u03bcm to 0.167 \u03bcm resulted in a proportional decrease in the coating\u2019s critical load (Lc1), from 23.3 N to 17.3 N. Concurrently, the corrosion potential (Ecorr) shifted positively, the charge transfer resistance (Rct) increased significantly, and the corrosion current density (Icorr) decreased markedly. After 14 days of immersion, the most substantial positive shift in Ecorr was observed, moving from \u22121.038 V to \u22120.803 V (\u0394E = 0.235 V). Rct increased dramatically from 2360 \u03a9\u00b7cm2 to 2.772 \u00d7 106 \u03a9\u00b7cm2, representing an enhancement of two orders of magnitude. Icorr decreased from 7.003 \u00d7 10\u22125 A\u00b7cm\u22122 to 1.182 \u00d7 10\u22126 A\u00b7cm\u22122, corresponding to a reduction of 98%. Following 20 days of immersion, the sample with a substrate roughness of 0.214 \u03bcm exhibited corrosion damage to the underlying substrate. In contrast, the coating on the sample with a lower roughness (0.167 \u03bcm) remained relatively intact. Surface roughness directly governs collision, adsorption, and diffusion processes during coating deposition. While higher roughness enhances coating-substrate interfacial adhesion, it concomitantly increases surface porosity, ultimately compromising corrosion resistance. Therefore, practical applications necessitate a comprehensive optimization of coating adhesion strength and corrosion resistance, tailored to specific service environments.<\/jats:p>","DOI":"10.3390\/ma19051005","type":"journal-article","created":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T13:11:22Z","timestamp":1772716282000},"page":"1005","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effect of H13 Surface Roughness on the Microstructure and Initial Corrosion Behavior of CrAlN Coatings"],"prefix":"10.3390","volume":"19","author":[{"given":"Chengyi","family":"Xu","sequence":"first","affiliation":[{"name":"College of Mechanical Engineering, Nantong Vocational University, Nantong 226007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shulin","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Nantong University, Nantong 226019, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Fan","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering, Nantong Vocational University, Nantong 226007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6274-5823","authenticated-orcid":false,"given":"Boyong","family":"Su","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Nantong University, Nantong 226019, China"},{"name":"National Key Laboratory for Remanufacturing, Beijing 100072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"110617","DOI":"10.1016\/j.triboint.2025.110617","article-title":"Wear of directed energy deposited H13 steel as a function of its graded microstructure","volume":"207","author":"Huang","year":"2025","journal-title":"Tribol. 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