植酸对纯镁超声微弧氧化层防护性能的影响

发布时间：2018-03-12 08:53

本文选题：超声微弧氧化　切入点：植酸　出处：《中国表面工程》2015年02期 　论文类型：期刊论文

【摘要】：针对纯镁超声微弧氧化贯穿性孔隙问题,采用植酸对微弧氧化层进行转化处理,探讨对氧化层的防护性影响。利用扫描电镜(SEM)研究植酸处理前后氧化层的形貌,并借助能谱分析仪(EDAX)、傅里叶红外光谱仪(FTIR)以及电化学腐蚀工作站等检测手段分析植酸处理前后氧化层的化学成分、官能团构成、耐腐蚀性能等,并对植酸成膜机理进行研究。结果表明:随着植酸浓度的增加,超声微弧氧化层孔隙量减少,更加致密均匀,覆盖度提高,表面富含磷酸基和羟基。其中植酸处理浓度为7.5g/L时为最佳,其膜层C、P元素含量最高,Mg元素含量最低,氧化层的自腐蚀电位正移最大,自腐蚀电流密度下降,氧化层的防护性能最好。
[Abstract]:Aiming at the permeation pore problem of pure magnesium ultrasonic micro-arc oxidation, phytic acid was used to transform the micro-arc oxidation layer, and the protective effect on the oxidation layer was discussed. The morphology of the oxide layer before and after phytic acid treatment was studied by scanning electron microscope (SEM). The chemical composition, functional group composition and corrosion resistance of the oxidation layer before and after phytic acid treatment were analyzed by means of EDAX, FTIR and electrochemical corrosion workstation. The mechanism of phytic acid film formation was studied. The results showed that with the increase of phytic acid concentration, the porosity of ultrasonic micro-arc oxidation layer was reduced, the porosity was more compact and uniform, and the coverage was increased. The surface is rich in phosphoric acid and hydroxyl groups, and phytic acid treatment concentration of 7.5 g / L is the best. The highest content of CnP element and the lowest content of mg element are found in the coating, and the self-corrosion potential of the oxide layer is the largest, and the self-corrosion current density decreases. The protective performance of oxide layer is the best.
【作者单位】：佳木斯大学黑龙江省高校生物医学材料重点实验室;
【基金】：佳木斯大学研究生科技创新项目(LZZ2014_012) 国家自然科学基金(31370979) 黑龙江省高校创新团队建设计划项目(2012TD010)
【分类号】：TG174.4

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