摘要
利用SEM ,XRD及盐雾腐蚀等试验手段 ,研究了MB8镁合金微弧氧化陶瓷层生长过程中显微缺陷与相组成的变化规律及其对耐蚀性的影响。结果表明 :微弧氧化初期 ,陶瓷层致密 ,几乎观察不到显微缺陷 ,随着处理时间的延长及陶瓷层的增厚 ,其外侧开始出现孔洞类缺陷 ,直至 90 %厚度范围布满相互交错的不规则孔洞 ;陶瓷层主要由MgO ,MgSiO3 ,MgAl2 O4 和非晶相组成 ,随着厚度的增加 ,陶瓷层中MgO的比例不断增加 ,而非晶相含量逐渐减少 ;短时间微弧氧化处理有利于制取以非晶相为主的致密无缺陷的耐蚀陶瓷层。
The change regulation of microflaw and phases constitution in the process of growth of ceramic coating formed by micro-arc oxidation on magnesium alloys and their influence on corrosion-resistance were studied by SEM, XRD and salt spray tests. The results show that in the initial stage of micro-arc oxidation the obtained ceramic coating is compact and nearly no microflaw can be observed, the microflaws like holes begin to appear in the exterior and finally irregular holes fill with 90% of the thickness range. The ceramic coating is mainly composed of MgO, MgSiO 3, MgAl 2O 4 and non-crystal phase. The proportion of MgO in the coating increases continually with the thickness increasing, but the proportion of non-crystal phase decreases gradually. The micro-arc oxidation of short time is beneficial to preparing compact and no flaw ceramic coating mainly composed of non-crystal phase.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2002年第3期454-457,共4页
The Chinese Journal of Nonferrous Metals
