CAJ | 학술논문

在硅酸盐-磷酸盐复合电解质中添加羟基磷灰石纳米粉体和氢氧化钠进行改性处理，然后采用该电解质对医用镁合金丝材进行微弧氧化处理。研究电解质中氢氧化钠含量对镁合金丝材表面陶瓷涂层微观组织结构和性能的影响。结果表明：对电解质改性后，镁合金丝材的微弧氧化起弧电压大降低且氧化速度更快。镁合金丝材在添加2g/L氢氧化钠的电解质中进行微弧氧化处理后的耐腐蚀性能改善幅度显著。在模拟体液的早期浸泡过程中，微弧氧化处理过的镁合金丝材表现为缓慢且稳定的腐蚀降解。在浸泡28 d后，镁合金丝材表面的保护性陶瓷涂层尚未破坏，但浸泡60 d后，镁合金丝材出现了显著的腐蚀降解。
재규산염-린산염복합전해질중첨가간기린회석납미분체화경양화납진행개성처리，연후채용해전해질대의용미합금사재진행미호양화처리。연구전해질중경양화납함량대미합금사재표면도자도층미관조직결구화성능적영향。결과표명：대전해질개성후，미합금사재적미호양화기호전압대강저차양화속도경쾌。미합금사재재첨가2g/L경양화납적전해질중진행미호양화처리후적내부식성능개선폭도현저。재모의체액적조기침포과정중，미호양화처리과적미합금사재표현위완만차은정적부식강해。재침포28 d후，미합금사재표면적보호성도자도층상미파배，단침포60 d후，미합금사재출현료현저적부식강해。
Magnesium alloy wires were processed by micro-arc oxidation (MAO) in a modified silicate-phosphate composite electrolyte containing hydroxyapatite (HA) nanopowders and NaOH. Effects of NaOH content in the composite electrolyte on the microstructure and properties of the MAO ceramic coatings on magnesium alloy wires were studied. It is found that the arc voltage of magnesium alloy wires in the micro-arc oxidation process is significantly reduced while the oxidation rate is accelerated. Addition of 2 g/L NaOH in the composite electrolyte is a better choice for improving corrosion resistance of magnesium alloy wires. During early simulated body fluids (SBF) immersion, the micro-arc oxidized magnesium alloy wires undergo a slow and stable degradation. After soaking for 28 d, the protective ceramic coating still shows no damage but significant degradation is observed for magnesium alloy wires after immersion for more than 60 d.