Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第3期    总第48期    2002年6月

[PDF全文下载]    [Flash在线阅读]    

    

文章编号:1004-0609(2002)03-0454-04
镁合金微弧氧化陶瓷层显微缺陷与
相组成及其耐蚀性
蒋百灵,张淑芬,吴国建,雷廷权

(西安理工大学 材料科学与工程学院, 西安 710048)

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,MgAl2O4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。

 

关键词: 镁合金;微弧氧化;非晶相;腐蚀

Microflaw and phases constitution  of
 ceramic coating formed by  micro-arc
oxidation on magnesium  alloys and
their influence on  corrosion-resistance
JIANG Bai-ling,ZHANG Shu-fen,WU Guo-jian, LEI Ting-quan

School of Materials Science and Engineering,
Xi′an University of Technology,Xi′an 710048,China

Abstract: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, MgSiO3, MgAl2O4 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.

 

Key words: magnesium alloy; micro-arc oxidation; non-crystal phase; corrosion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com