国泰榕,卢小鹏,李岩,张涛,王福会.磷酸盐后处理对Mg-Gd-Y合金微弧氧化涂层耐蚀性能的影响[J].表面技术,2021,50(9):278-285, 310.
GUO Tai-rong,LU Xiao-peng,LI Yan,ZHANG Tao,WANG Fu-hui.Effect of Phosphate Post-treatment on Corrosion Resistance of Micro-arc Oxidation Coating on Mg-Gd-Y Alloy[J].Surface Technology,2021,50(9):278-285, 310
磷酸盐后处理对Mg-Gd-Y合金微弧氧化涂层耐蚀性能的影响
Effect of Phosphate Post-treatment on Corrosion Resistance of Micro-arc Oxidation Coating on Mg-Gd-Y Alloy
投稿时间:2020-11-09  修订日期:2021-04-07
DOI:10.16490/j.cnki.issn.1001-3660.2021.09.029
中文关键词:  镁稀土合金  微弧氧化  磷酸盐后处理  缓蚀剂  耐蚀性能
英文关键词:rare earth magnesium alloy  micro-arc oxidation  phosphate post-treatment  corrosion inhibitor  corrosion resistance
基金项目:国家自然科学基金(52071067)
作者单位
国泰榕 东北大学 材料科学与工程学院,沈阳 110819 
卢小鹏 东北大学 材料科学与工程学院,沈阳 110819 
李岩 东北大学 材料科学与工程学院,沈阳 110819 
张涛 东北大学 材料科学与工程学院,沈阳 110819 
王福会 东北大学 材料科学与工程学院,沈阳 110819 
AuthorInstitution
GUO Tai-rong School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 
LU Xiao-peng School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 
LI Yan School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 
ZHANG Tao School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 
WANG Fu-hui School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 
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中文摘要:
      目的 为进一步提高镁稀土合金微弧氧化涂层的耐蚀性能。方法 首先在镁稀土合金表面制备了微弧氧化涂层,随后用磷酸盐后处理溶液,对Mg-Gd-Y合金硅酸盐微弧氧化涂层进行了封孔后处理,并在此过程中添加了缓蚀剂。利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对涂层表面形貌和成分进行分析,利用极化曲线和电化学阻抗(EIS)测试了涂层的耐蚀性能。结果 后处理能够在微弧氧化涂层表面形成MgHPO4沉积层,沉积层的产生有效地封闭了微弧氧化涂层表面的微孔、裂纹等缺陷。缓蚀剂的添加显著增加了沉积物的量,使涂层的磷元素原子数分数由5.37%增加至14.90%,沉积效果显著。极化实验证明,封孔后处理涂层的腐蚀电流密度由1.51×10–7 A/cm2降至4.91×10–8 A/cm2,负载缓蚀剂后,涂层的腐蚀电流密度进一步降低至5.76×10–9 A/cm2,表明其耐蚀性能显著提高。微弧氧化涂层在3.5% NaCl溶液中浸泡384 h后,含缓蚀剂的涂层的总阻抗值可达7825.3 Ω.cm2,明显高于未封孔处理的微弧氧化涂层(403 Ω.cm2),这证明,后处理可有效提高微弧氧化涂层的耐蚀性能。结论 磷酸盐后处理能够在微弧氧化涂层表面生成MgHPO4沉积层,有效地对微弧氧化涂层表面的微孔和微裂纹进行了封闭。缓蚀剂的添加能够显著增强磷酸盐的沉积效果,使涂层的耐蚀性能在后处理的基础上进一步提高。
英文摘要:
      To improve the corrosion resistance of Mg-RE alloy, micro-arc oxidation coating was formed on the surface of the Mg-RE alloy. The Mg-Gd-Y alloy silicate microarc oxide coating was subsequently post-treated with a phosphate post-treatment solution to seal the holes, and the corrosion inhibitor was added in the process. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to analyze the surface morphology and composition of the coating. The polarization curve and electrochemical impedance spectroscopy (EIS) were used to test the corrosion resistance of the coating. Post-treatment can form a MgHPO4 deposition layer on the surface of the micro-arc oxidation coating. The generation of the deposition layer effectively sealed the micro-holes, cracks and other defects on the surface of the micro-arc oxidation coating. The addition of corrosion inhibitors significantly increased the amount of deposits, which increased the phosphorus content of the coating from 5.37% to 14.90%, which significantly enhanced the deposition. The polarization experiment shows that the corrosion current density of the coating after post-treatment decreased from 1.51×10–7 A/cm2 to 4.91×10–8 A/cm2. The corrosion current density is further reduced to 5.76×10–9 A/cm2 after loading the corrosion inhibitor, indicating that the corrosion resistance is significantly improved. After the coating is soaked in 3.5 wt.% NaCl solution for 384 hours, the total impedance of the post-treatment coating loaded with corrosion inhibitor can reach to 7825.3 Ω.cm2, which is significantly higher than the 403 Ω.cm2 of the micro-arc oxidation coating. It can effectively improve the corrosion resistance of the micro-arc oxidation coating. Furthermore, when the high efficiency corrosion inhibitor SDS was added, the resistance increased tenfold. The resistance of the sealed MAO coating with inhibitor increased from 0~48 h, which is related to the release of the inhibitor. The gradual release of the inhibitor guarantees a long-time corrosion resistance of the coating.
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