{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T02:52:44Z","timestamp":1789181564128,"version":"build-2803163510"},"reference-count":45,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2023,5,24]],"date-time":"2023-05-24T00:00:00Z","timestamp":1684886400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Ministry of Science and Higher Education of the Russian Federation","award":["FSFS-2021-0006"],"award-info":[{"award-number":["FSFS-2021-0006"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Coatings with a thickness from ~40 to ~50 \u00b5m on Ti6Al4V titanium alloys were formed by plasma electrolytic oxidation (PEO) in a silicate-hypophosphite electrolyte with the addition of graphene oxide. The PEO treatment was carried out in the anode\u2013cathode mode (50 Hz) at a ratio of anode and cathode currents of 1:1; their sum density was 20 A\/dm2, and the treatment\u2019s duration was 30 min. The effect of the graphene oxide\u2019s concentration in the electrolyte on the thickness, roughness, hardness, surface morphology, structure, composition, and tribological characteristics of the PEO coatings was studied. Wear experiments, under dry conditions, were carried out in a ball-on-disk tribotester with an applied load of 5 N, a sliding speed of 0.1 m\u00b7s\u22121, and a sliding distance of 1000 m. According to the obtained results, the addition of graphene oxide (GO) into the base silicate-hypophosphite electrolyte leads to a slight decrease in the coefficient of friction (from 0.73 to 0.69) and a reduction in the wear rate by more than 1.5 times (from 8.04 to 5.2 mm3\/N\u00b7m), with an increase in the GO\u2019s concentration from 0 to 0.5 kg\/m3, respectively. This occurs due to the formation of a GO-containing lubricating tribolayer upon contact with the coating of the counter-body in the friction pair. Delamination of the coatings during wear occurs due to contact fatigue; with an increase in the concentration of GO in the electrolyte from 0 to 0.5 kg\/m3, this process slows down by more than four times.<\/jats:p>","DOI":"10.3390\/ma16113928","type":"journal-article","created":{"date-parts":[[2023,5,25]],"date-time":"2023-05-25T02:30:06Z","timestamp":1684981806000},"page":"3928","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":47,"title":["Investigation of Tribological Characteristics of PEO Coatings Formed on Ti6Al4V Titanium Alloy in Electrolytes with Graphene Oxide Additives"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8239-5354","authenticated-orcid":false,"given":"Sergey","family":"Grigoriev","sequence":"first","affiliation":[{"name":"Spark Plasma Sintering Research Laboratory, Moscow State University of Technology \u201cSTANKIN\u201d, Vadkovsky per.1, Moscow 127055, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikita","family":"Peretyagin","sequence":"additional","affiliation":[{"name":"Spark Plasma Sintering Research Laboratory, Moscow State University of Technology \u201cSTANKIN\u201d, Vadkovsky per.1, Moscow 127055, Russia"},{"name":"Scientific Department, A.I. Evdokimov Moscow State University of Medicine and Dentistry, Delegatskaya St., 20, p.1, Moscow 127473, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7829-7356","authenticated-orcid":false,"given":"Andrey","family":"Apelfeld","sequence":"additional","affiliation":[{"name":"Department 1203, Moscow Aviation Institute, National Research University, Volokolamskoe Shosse, 4, Moscow 125993, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7970-2595","authenticated-orcid":false,"given":"Anton","family":"Smirnov","sequence":"additional","affiliation":[{"name":"Spark Plasma Sintering Research Laboratory, Moscow State University of Technology \u201cSTANKIN\u201d, Vadkovsky per.1, Moscow 127055, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5887-3291","authenticated-orcid":false,"given":"Alexei","family":"Morozov","sequence":"additional","affiliation":[{"name":"Laboratory of Tribology, Ishlinsky Institute for Problems in Mechanics RAS, pr. Vernandskogo, 101-1, Moscow 119526, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elena","family":"Torskaya","sequence":"additional","affiliation":[{"name":"Laboratory of Tribology, Ishlinsky Institute for Problems in Mechanics RAS, pr. Vernandskogo, 101-1, Moscow 119526, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina","family":"Volosova","sequence":"additional","affiliation":[{"name":"Spark Plasma Sintering Research Laboratory, Moscow State University of Technology \u201cSTANKIN\u201d, Vadkovsky per.1, Moscow 127055, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleg","family":"Yanushevich","sequence":"additional","affiliation":[{"name":"Scientific Department, A.I. Evdokimov Moscow State University of Medicine and Dentistry, Delegatskaya St., 20, p.1, Moscow 127473, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikolay","family":"Yarygin","sequence":"additional","affiliation":[{"name":"Scientific Department, A.I. Evdokimov Moscow State University of Medicine and Dentistry, Delegatskaya St., 20, p.1, Moscow 127473, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natella","family":"Krikheli","sequence":"additional","affiliation":[{"name":"Scientific Department, A.I. Evdokimov Moscow State University of Medicine and Dentistry, Delegatskaya St., 20, p.1, Moscow 127473, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9053-496X","authenticated-orcid":false,"given":"Pavel","family":"Peretyagin","sequence":"additional","affiliation":[{"name":"Spark Plasma Sintering Research Laboratory, Moscow State University of Technology \u201cSTANKIN\u201d, Vadkovsky per.1, Moscow 127055, Russia"},{"name":"Scientific Department, A.I. Evdokimov Moscow State University of Medicine and Dentistry, Delegatskaya St., 20, p.1, Moscow 127473, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1357","DOI":"10.1007\/s11666-012-9808-4","article-title":"Optical Monitoring in Laser Cladding of Ti6Al4V","volume":"21","author":"Smurov","year":"2012","journal-title":"J. Therm. 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