A study on corrosion behaviour of magnetron sputtered Zn–Mg coating deposited onto electro-galvanized steel
- Resource Type
- Authors
- Caizhen Yao; See Leng Tay; Tianping Zhu; Wei Gao; Weiwei Chen
- Source
- Surface and Coatings Technology. 249:90-96
- Subject
- Materials science
Carbon steel
Metallurgy
Surfaces and Interfaces
General Chemistry
engineering.material
Condensed Matter Physics
Microstructure
Galvanization
Surfaces, Coatings and Films
Corrosion
Dielectric spectroscopy
symbols.namesake
Coating
Materials Chemistry
engineering
symbols
Electroplating
Environmental scanning electron microscope
- Language
- ISSN
- 0257-8972
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 Zn5(OH)8Cl2·H2O layer was also discussed. An electroplated Zn coating was also investigated for comparison purposes.