摘要
采用微等离子体氧化方法在AZ91D镁合金表面制备陶瓷层。利用扫描电镜、X射线分析陶瓷层微观组织结构,通过盐雾试验方法测试处理过的AZ91D镁合金酎腐蚀性能。结果表明,AZ91D镁合金经过微等离子体表面氧化处理后,陶瓷层由表面的疏松层和内部致密层所组成,疏松层里有较多的孔隙;致密层孔隙较少且与基体结合牢固;微等离子体氧化陶瓷膜的相结构主要由MgAl_2Si_3O_(12),β-Mg_2SiO_4,(Mg_4Al_(14))(Al_4Si_2)O_(20)等含硅的尖晶石型氧化物和δ-MgAl_(28)O_4等Mg,Al复合氧化物构成。AZ91D镁合金经微等离子体氧化处理后,基体被氧化膜覆盖,使其抗腐蚀性能显著提高,试样表面有陶瓷膜的AZ91D镁合金在盐雾试验中的腐蚀速率是AZ91D镁合金腐蚀速率的1/8.61。
The ceramic coating was formed by the means of micro-plasma arc oxidation on AZ91D magnesium alloy. Mictrostructural characterization was observed using scanning electron microscope, and experiment of corrosion resistantance of AZ91D was performed by the means of salt fog box. The results showed that the ceramic coating were composed of loose layer and tight layer. A great deal of pores were found in the loose layer, and yet minor pores were found in the tight layer. The excellence combinative boundary was obtained in the tight layer with matrix. The ceramic coating were composed of MgAl2Si3O12, β-Mg2SiO4, （Mg4Al14）（Al4Si2）O20 and δ-MgAl2.8O4. Passing through the processing of micro-plasma arc oxidation, AZ91D materials were covered by ceramic coating, which is the reason that corrosion resistance is improved. The corrosion ratio of AZ91D covered by ceramic coating to AZ91D is 1：8.61
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A02期674-676,共3页
Rare Metal Materials and Engineering
关键词
微等离子体氧化
抗腐蚀性能
镁合金
micro-plasma oxidation
performance of resistant corrosion
magnesium alloy
