摘要
为提高AZ80镁合金的耐蚀性,采用微弧氧化技术在镁合金表面原位生长氧化膜,主要研究电解液成分Na_(2)SiO_(3)和NaOH浓度对微弧氧化膜耐蚀性的影响。借助X射线衍射仪和能谱仪分析氧化膜的化学组成;借助扫描电镜分析氧化膜的微观形貌;采用中性盐雾试验表征氧化膜的耐蚀性。结果表明:镁合金氧化膜耐蚀性随Na_(2)SiO_(3)浓度的增加,先提高后下降,随着NaOH浓度的增加而提高。最优电解液配比下制备的氧化膜经96 h中性盐雾试验未发生腐蚀,这种优异的耐蚀性归因于表面生成的Mg_(2)SiO_(4)陶瓷相和自封孔结构。
In order to improve the corrosion resistance of AZ80 magnesium alloy,the oxide film was grown in-situ on the surface of magnesium alloy by micro-arc oxidation(MAO).Effects of Na_(2)SiO_(3) and NaOH on the corrosion resistance of MAO film were systematically investigated.The chemical composition of oxide film was characterized by X-ray diffraction(XRD)and energy spectroscopy(EDS).The microstructure of oxide film was characterized by scanning electron microscopy(SEM).the corrosion resistance was studied by neutral salt spray test.The results indicate the corrosion resistance of MAO film increases first and then decreases with the increase of Na_(2)SiO_(3) concentration,and increases with the increase of NaOH concentration.The MAO film fabricated under optimal ratio exhibits excellent corrosion resistance without pit corrosion after neural salt spray test for 96 h,which is attributed to Na_(2)SiO_(4) phase generated on the surface and self-sealing microstructure.
作者
吴瑜
陈刚
王红杰
杨晓禹
钱坤明
徐恒秋
朱利萍
WU Yu;CHEN Gang;WANG Hongjie;YANG Xiaoyu;QIAN Kunming;XU Hengqiu;ZHU Liping(Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China;Changchun Equipment Technology Research Institute,Changchun 130012,China)
出处
《热加工工艺》
北大核心
2023年第14期85-89,共5页
Hot Working Technology
基金
宁波市自然科学基金资助项目(2014A610052,202003N4339)。
关键词
AZ80镁合金
微弧氧化
中性盐雾试验
耐蚀性
AZ80 magnesium alloy
micro-arc oxidation
neutral salt spray test
corrosion resistance
作者简介
吴瑜(1994-),男,浙江龙游人,助理工程师,硕士,主要研究方向:金属材料表面处理,E-mail:395016693@qq.com。
