CAJ | 학술논문

为提高镁在腐蚀环境中的耐蚀性,使用微弧氧化方法在纯镁表面制备1层保护性的陶瓷层,并在硅酸钠水溶液中对陶瓷层进行封孔。极化曲线测量结果表明,陶瓷层经封孔后在模拟体液(SBF)中具有更好的耐蚀性。但 SBF 浸泡实验揭示在浸泡初期,陶瓷层并不能有效保护基体镁,直至因镁腐蚀而产生的沉积物对陶瓷层中存在的孔洞进行二次封孔后,基体镁的腐蚀才被显著延缓。另外,SBF 浸泡实验也表明覆盖微弧氧化陶瓷层的样品能有效诱导 Ca-P 沉积。
위제고미재부식배경중적내식성,사용미호양화방법재순미표면제비1층보호성적도자층,병재규산납수용액중대도자층진행봉공。겁화곡선측량결과표명,도자층경봉공후재모의체액(SBF)중구유경호적내식성。단 SBF 침포실험게시재침포초기,도자층병불능유효보호기체미,직지인미부식이산생적침적물대도자층중존재적공동진행이차봉공후,기체미적부식재피현저연완。령외,SBF 침포실험야표명복개미호양화도자층적양품능유효유도 Ca-P 침적。
To improve the corrosion resistance of magnesium in corrosive environments,a protective micro-arc oxidation (MAO )coating was prepared on magnesium substrate.The ceramic coating was then sealed in Na2 SiO 3 solution.The results of polarization curves show that the specimen with MAO coating sealed in Na2 SiO 3 solution has a better corrosion resistance in simulated body fluid (SBF).However,the coating cannot provide efficient protection for the magnesium substrate during the initial immersion in SBF.Until a precipitate layer resulting from corrosion of the magnesium substrate covers on the MAO coating,the degradation of the magnesium substrate was significantly delayed because of the sealing action of the precipitates.In addition,im-mersion tests also suggest that the specimen with MAO coating can efficiently induce Ca-P precipitation in SBF.