论文部分内容阅读
通过室内浸泡模拟实验方法,采用扫描Kelvin探针技术研究了SiCp/Al复合材料在Cl~-介质下初期腐蚀行为。结果表明,SiC颗粒与Al基体界面结合处是复合材料在Cl~-介质下初期腐蚀的优先发生位置,Cl~-和界面相是促进初期腐蚀发展的主要原因。随腐蚀的不断进行,复合材料先形成钝化膜,表面电位先整体正移,后钝化膜破损,表面电位整体负向移动。复合材料初期腐蚀过程表现为其钝化膜形成和逐渐破损的腐蚀特征,腐蚀产物主要为Al(OH)_3、Al_2O_3和AlCl_3。
The initial corrosion behavior of SiCp / Al composites in Cl ~ - media was studied by the scanning Kelvin probe through the laboratory immersion simulation experiment. The results show that the interface between the SiC particles and the Al matrix is the preferential site for initial corrosion of the composite under the Cl ~ - medium, and Cl - and interfacial phases are the main reasons for promoting the initial corrosion. With the continuous corrosion, the composite material first forms a passivation film, the surface potential first moves positively, then the passivation film breaks down and the surface potential moves negatively as a whole. The initial corrosion process of the composites is characterized by the formation and gradual deterioration of the passivation film. The corrosion products mainly consist of Al (OH) 3, Al 2 O 3 and AlCl 3.