A study on corrosion behaviour of magnetron sputtered Zn-Mg coating deposited onto electro-galvanized steel

作者：Yao, Caizhen^*; Chen, Weiwei; Zhu, Tianping; Tay, See Leng; Gao, Wei

来源：Surface and Coatings Technology, 2014, 249: 90-96.

DOI：10.1016/j.surfcoat.2014.03.055

• Metal coatings
• Sputtered films
• EIS
• Passive films

In this study, a nano-structured Zn-Mg coating was prepared by magnetron co-sputtering on electro-galvanized carbon steel. The microstructure and phase structure of Zn-Mg coating and its behaviour during saltwater immersion test were investigated by means of optical microscopy (OM), environmental scanning electron microscopy (ESEM), X-ray diffractometry (XRD) and electrochemical workstation. Electrochemical impedance spectroscopy (EIS) as a sensitive and reliable method was employed in corrosion mechanism research. The results show the formation process of a passive film on the surface of Zn-Mg coating during the immersion time range. The formation mechanism of this dense corrosion product Zn-5(OH)(8)Cl-2 center dot H2O layer was also discussed. An electroplated Zn coating was also investigated for comparison purposes.

• 出版日期2014-6-25
• 单位北京理工大学