镁合金表面电弧喷涂铝涂层在氯离子中的腐蚀行为

采用电弧喷涂技术在镁合金AZ91基材表面制备铝涂层.通过5(质量分数,%)NaCl溶液浸泡试验和盐雾试验,考察了镁合金表面铝涂层在氯离子中的耐蚀性能及其腐蚀行为.利用光学显微镜、扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析技术对涂层形貌、显微组织结构和相组成进行了研究.结果表明,封孔处理后的试样耐蚀性能有较大提高,未封孔的涂层试样腐蚀比原始镁合金更严重.

Corrosion behavior of arc sprayed aluminum coating on magnesium alloy in chlorine ion

Aluminum coating on AZ91 magnesium alloy was deposited by arc spraying. The ability to corrosion resistance and corrosion behavior of the aluminium coating were evaluated by immersing specimen in 5wt. % NaCl solution as well as salt spray test, and the morphology, mi-crostructure and phase compositions of the coatings were studied by means of optical microscope and X-ray analysis after all the tests and expei-ments. The results show that the ability to corrosion resistance when specimen sealed was improved significantly, and the corrosiveness when specimen unsealed was more serious than that of the magnesium alloys.