Effect of SiO2-reinforcement and alkali treatment on the corrosion resistance of plasma electrolytic oxide coating on AZ31 magnesium alloy

IF 7.5 Q1 CHEMISTRY, PHYSICAL Applied Surface Science Advances Pub Date : 2024-08-26 DOI:10.1016/j.apsadv.2024.100631
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Abstract

Plasma electrolytic oxidation (PEO) produces an oxide coating containing pores and cracks lowering corrosion protection. The defects can be sealed by in-situ or post-treatment methods. This work compares the sealing effect of SiO2 particles and post-alkali treatment on the corrosion resistance of PEO coatings formed on AZ31 magnesium (Mg) alloy. PEO was conducted in a phosphate-based electrolyte containing 2 g/l nanoparticle SiO2 at a constant current density of 300 A/m2 for 10 min. The post-alkali treatment was performed in 0.5 M NaOH solution at 80 °C for 30 min. The corrosion resistance was evaluated using polarization, electrochemical impedance spectroscopy, and weight loss tests. The SiO2 particles were successfully embedded uniformly in the Mg3(PO4)2 coating, enhancing the coating compactness and stability. The reinforced coating exhibited ten times higher impedance modulus and lower corrosion current density. The post-alkali treatment improved corrosion resistance but not as high as the SiO2 reinforcement. The impedance modulus of the alkali-treated specimen increased five times, and the corrosion current density decreased three times of the base coating. The weight loss test consistently showed that the SiO2-reinforced coating generated lower mass loss during 14 days of immersion in simulated body fluid.

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二氧化硅强化和碱处理对 AZ31 镁合金等离子电解氧化物涂层耐腐蚀性的影响
等离子电解氧化(PEO)产生的氧化物涂层含有气孔和裂缝,可降低腐蚀防护能力。这些缺陷可通过原位或后处理方法进行密封。本研究比较了二氧化硅颗粒和后碱处理对 AZ31 镁(Mg)合金上形成的 PEO 涂层耐腐蚀性的密封效果。PEO 在含有 2 g/l 纳米颗粒 SiO2 的磷酸盐电解液中以 300 A/m2 的恒定电流密度进行 10 分钟。后碱处理在 0.5 M NaOH 溶液中进行,温度为 80 °C,时间为 30 分钟。使用极化、电化学阻抗光谱和失重测试对耐腐蚀性能进行了评估。二氧化硅颗粒成功地均匀嵌入了 Mg3(PO4)2 涂层,增强了涂层的致密性和稳定性。增强涂层的阻抗模量提高了十倍,腐蚀电流密度降低了。后碱处理提高了耐腐蚀性,但不如 SiO2 增强层高。碱处理试样的阻抗模量提高了五倍,腐蚀电流密度降低了三倍。失重试验一致表明,SiO2 增强涂层在模拟体液中浸泡 14 天后产生的质量损失较小。
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CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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