Improved electrochemical stability of AZ31B magnesium alloy via PEO surface films with strontium and chromium additives at different current densities

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-09-15 DOI:10.1016/j.surfcoat.2025.132681

A. Fardosi , A. Fattah-alhosseini , M. Karbasi , R. Chaharmahali , B. Dikici

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引用次数: 0

Abstract

Plasma electrolytic oxidation (PEO) is a versatile technique employed to generate adherent and protective oxide layers on magnesium-based substrates through electrochemical plasma discharge. This study investigates the influence of 0.5 gˑL⁻¹ strontium nitrate and 0.5 gˑL⁻¹ chromium nitrate additives using an electrolyte system containing phosphate species during the PEO processing of AZ31B alloy under two distinct current regimes: 6 and 12 Aˑdm⁻². Scanning electron microscopy (SEM) was employed to evaluate surface topology and to estimate the layer thickness of the coatings. Grazing incidence X-ray diffraction (GXRD) was utilized to identify the crystalline phases present in the coating structure. Surface wettability and roughness were evaluated through contact angle measurements and surface profilometry, respectively. Electrochemical techniques, including impedance spectroscopy and polarization analysis, were used to investigate the corrosion response of the coated samples. The incorporation of strontium improved coating compactness and hydrophobicity, leading to enhanced corrosion resistance. Notably, the Sr-modified coating formed at 12 Aˑdm⁻² exhibited the highest performance, achieving a polarization resistance of 1480 kΩˑcm² after 48 h of immersion. These results highlight the effectiveness of strontium-enhanced PEO processing in developing corrosion-resistant coatings for magnesium alloys.

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添加锶和铬的PEO表面膜在不同电流密度下提高AZ31B镁合金的电化学稳定性

等离子体电解氧化（PEO）是一种通过电化学等离子体放电在镁基衬底上产生粘附和保护氧化层的通用技术。本研究研究了0.5 g L L−1硝酸锶和0.5 g L L−1硝酸铬添加剂在含有磷酸盐的电解质体系中，在6和12 A A - dm−2两种不同电流体制下对AZ31B合金PEO加工的影响。利用扫描电子显微镜（SEM）对涂层的表面拓扑结构进行了评价，并对涂层的层厚进行了估计。利用掠入射x射线衍射（GXRD）鉴定了涂层结构中存在的晶相。表面润湿性和粗糙度分别通过接触角测量和表面轮廓测量进行评估。利用电化学技术，包括阻抗谱和极化分析，研究了涂层样品的腐蚀响应。锶的掺入改善了涂层的致密性和疏水性，从而增强了耐腐蚀性。值得注意的是，在12 A ω - dm−2下形成的sr改性涂层表现出最高的性能，在浸泡48 h后，其极化电阻达到1480 kΩ ω - cm2。这些结果突出了锶增强PEO工艺在开发镁合金耐腐蚀涂层方面的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.