HR-2不锈钢室温熔盐镀铝

Electroplating of HR-2 Stainless Steel by Aluminum in Ambient Temperature Chloroaluminate Melts

为在不锈钢表面制备铝化物阻氚渗透层奠定基础,采用AlCl3-MEIC(氯化1-甲基3-乙基咪唑)室温熔盐在HR-2不锈钢表面进行镀铝实验,主要研究镀前处理方式,电流密度对镀层的形貌、结合力、纯度的影响。结果表明,采用AlCl3-MEIC室温熔盐体系在HR-2不锈钢上镀铝是可行的。传统的酸洗镀前处理能得到质量较高的镀层,但界面结合不好;电化学清洗镀前处理后可制得结合良好的高质量镀层。纯白色铝镀层表面光滑、均匀、致密,呈现有一定棱角的球形颗粒状生长特性。镀层颗粒尺寸随电流密度的增加而增大。较优的电流密度范围为10～20mAcm-2,电镀时间至少40min。

To fabricate Tritium Penetration Barrier （TBP） of aluminide coating on stainless steel,aluminum electrodeposition experiments on the HR-2 stainless steel were carried out by ambient temperature chloroaluminate melts AlCi3（aluminum chloride）/EMIC （1-ethyl-3-methylimidazolium chloride） under the protection of argon gas. The influences of pre-treatment of the substrate and the current density on the surface morphology,purity and adhesion of the aluminum coating were examined. The results show that the aluminum electrodeposition on HR-2 stainless steel by ambient temperature melts system AlCl3/MEIC is feasible. The aluminum coating on the HR-2 stainless steel substrate with conventional pretreatment is of high quality but the adherence to the substrate is not good. However,electrochemical etching of the substrate by anodic polarization prior to electroplating leads to well-adherent Al coating of HR-2 stainless steel. The deposited aluminum coating is white,smooth,uniform and dense,having the characteristics of irregular sphere particle-like growth with certain edge angle. The particle size of the aluminum coating increases with increasing current density. The preferable range of current density is 10-20 mA/cm2,and the electroplating time is 40 min at least.