在高速电镀锌钢板表面磁控溅射铝镁合金

Research of magnetron sputtered Al-Mg alloy coatings on high-speed electro-galvanizing steel

采用双靶直流磁控溅射工艺,在高速电镀锌基片上制备了铝镁合金镀层.用SEM、EDS和XRD方法分析了镀层的形貌和组分,借助电化学试验和中性盐雾(NSS)试验研究了靶功率和衬底温度对镀层耐蚀性的影响.结果表明:随着衬底温度升高,镀层趋于致密,但球状颗粒增多,自腐蚀电流密度略有增加;铝靶的功率为900 W,镁靶的功率为200 W,衬底温度为150℃时镀层的耐蚀性最优,自腐蚀电流密度约为4μAcm^(-2),耐中性盐雾时间为120 h,经分析,镀层组分主要为Al_(12)Mg_(17).

The AI-Mg alloy coatings were deposited on high-speed electro-galvanizing steel by double-target DC magnetron sputtering process. The morphologies and compositions were analyzed, and the influences of target power and substrate temperature on corrosion-resistance properties were investigated by electrochemical measurement and neutral salt spray test. The results show that the coatings distribute dense with increasing the substrate temperature, but excessively high temperature cause more granular particles and slightly higher corrosion current density. The optimal corrosion-resistance proper- ties can be achieved by synthetic adjustment of target power and substrate temperature. The corrosion current density is approximately 4 μAcm^-2 and anti-salt spray time is 120 h. The structure of coatings is determined to be Al12Mg17.