Frontier Materials & TechnologiesFrontier Materials & TechnologiesFrontier Materials & Technologies2782-40392782-6074Togliatti State University89510.18323/2782-4039-2023-4-66-8ArticlesСтатьиThe influence of addition of ZrO2 nanoparticles to the electrolyte on the structure and anticorrosion properties of oxide layers formed by plasma electrolytic oxidation on the Mg97Y2Zn1 alloyВлияние добавки наночастиц ZrO2 в электролит на структуру и антикоррозионные свойства оксидных слоев, формируемых плазменно-электролитическим оксидированием на сплаве Mg97Y2Zn1https://orcid.org/0000-0002-3952-9556PoluninaAlisa OlegovnaПолунинаАлиса Олеговна
Russian Federation

researcher of the Research Institute of Advanced Technologies

научный сотрудник НИИ прогрессивных технологий

a.cheretaeva@tltsu.ruhttps://orcid.org/0000-0001-8484-2456PoluninAnton ViktorovichПолунинАнтон Викторович
Russian Federation

PhD (Engineering), leading researcher of the Research Institute of Advanced Technologies

кандидат технических наук, ведущий научный сотрудник НИИ прогрессивных технологий

Anpol86@gmail.comhttps://orcid.org/0000-0001-7189-0002KrishtalMikhail MikhailovichКришталМихаил Михайлович
Russian Federation

Doctor of Sciences (Physics and Mathematics), Professor, chief researcher of the Research Institute of Advanced Technologies

доктор физико-математических наук, профессор, главный научный сотрудник НИИ прогрессивных технологий

krishtal@tltsu.ruTogliatti State University, TogliattiТольяттинский государственный университет, Тольятти301220234879828122023https://vektornaukitech.ru/jour/article/view/895

Magnesium alloys with a strengthening long-period stacking ordered structure (LPSO-phase) offer outstanding mechanical properties, but their low corrosion resistance necessitates additional surface protection. The work investigates the influence of adding ZrO2 nanoparticles at a concentration of 1–4 g/l to the electrolyte on the thickness, structure, composition, wettability, and anticorrosion properties of oxide layers formed during plasma electrolytic oxidation (PEO) of the Mg97Y2Zn1 alloy with the LPSO-phase. It was found that during PEO, under the influence of an electric field, ZrO2 nanoparticles penetrate into the forming oxide layer and reduce its porosity. The study revealed a decrease in the quantity and size of pores near the barrier layer in places where the alloy LPSO-phase comes out to the interface with the oxide layer. Low concentrations of ZrO2 nanoparticles (1–2 g/l) reduce the corrosion rate of the alloy up to two times compared to the base case. The minimum corrosion current density icorr≈14 nA/cm2 and the highest polarization resistance Rp≈2.6 MΩ·cm2 are found in the sample formed in an electrolyte with the addition of 1 g/l of ZrO2 nanoparticles. Calculation of the barrier zone parameters of oxide layers showed that an increase in the ZrO2 concentration in the electrolyte leads to an increase in the barrier layer thickness and in its specific conductivity, which negatively affects the corrosion resistance of the formed oxide layers – the barrier zone resistance of the layer obtained by adding 4 g/l of ZrO2, drops by ~20 % compared to the base case (up to ~1 MΩ·cm2).

Магниевые сплавы с упрочняющей длиннопериодической упорядоченной структурой (long-period stacking ordered structure, LPSO-фаза) обладают выдающими механическими свойствами, однако их низкая коррозионная стойкость обуславливает необходимость в дополнительной поверхностной защите. В работе исследовано влияние добавок в электролит наночастиц ZrO2 в концентрации 1–4 г/л на толщину, структуру, состав, смачиваемость и антикоррозионные свойства оксидных слоев, формируемых при плазменно-электролитическом оксидировании (ПЭО) сплава Mg97Y2Zn1 с LPSO-фазой. Установлено, что при ПЭО наночастицы ZrO2 под действием электрического поля внедряются в формирующийся оксидный слой, а также снижают его пористость. Выявлено снижение количества и размеров пор вблизи барьерного слоя в местах выхода LPSO-фазы сплава к границе раздела с оксидным слоем. Малые концентрации наночастиц ZrO2 (1–2 г/л) снижают скорость коррозии сплава по сравнению с базовым вариантом до двух раз. Минимальной плотностью тока коррозии iкорр≈14 нА/см2 и наибольшим поляризационным сопротивлением Rп≈2,6 MОм·см2 обладает образец, сформированный в электролите с добавкой 1 г/л наночастиц ZrO2. Расчет параметров барьерной зоны оксидных слоев показал, что повышение концентрации ZrO2 в электролите приводит к увеличению толщины барьерного слоя и росту его удельной проводимости, что отрицательно сказывается на коррозионной стойкости формируемых оксидных слоев: сопротивление барьерной зоны слоя, полученного при добавке 4 г/л ZrO2, падает на ~20 % по сравнению с базовым вариантом (до ~1 МОм·см2).

magnesium alloyMg97Y2Zn1ZrO2 nanoparticlesLPSO-phaseplasma electrolytic oxidationnanoparticleszirconium oxidesurface contact (wetting) anglecorrosion resistancebarrier zone conductivityмагниевый сплавMg97Y2Zn1наночастицы ZrO2LPSO-фазаплазменно-электролитическое оксидированиенаночастицыоксид циркониякраевой угол смачивания поверхностикоррозионная стойкостьпроводимость барьерной зоныThe work was supported by the Russian Science Foundation (Project No. 21-19-00656, https://rscf.ru/project/21-19-00656/). The paper was written on the reports of the participants of the XI International School of Physical Materials Science (SPM-2023), Togliatti, September 11–15, 2023.Работа выполнена при поддержке Российского научного фонда (проект № 21-19-00656, https://rscf.ru/project/21-19-00656/). Статья подготовлена по материалам докладов участников XI Международной школы «Физическое материаловедение» (ШФМ-2023), Тольятти, 11–15 сентября 2023 года.Landkof B. 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