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

The Al-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 properties can be achieved by synthetic adjustment of target power and substrate temperature.The corrosion current density is approximately 4μAcm~(-2) and anti-salt spray time is 120 h.The structure of coatings is determined to be Al_(12)Mg_(17).