|
1337 |
|
Study on corrosion resistance behaviors of Zn, Al, Zn/Al 85/15 coatings that produced by twin wire arc spray technique on steel |
|
Ahmet Turk / Sakarya Universtiy, Department of Metallurgical and Materials Engineering , Turkey Ozgur Cevher / Sakarya University Department of Metallurgical and Material Engineering, TURKEY Ahmet Gulec/ Sakarya University Department of Metallurgical and Material Engineering, TURKEY Fatih Ustel/ Sakarya University Department of Metallurgical and Material Engineering, TURKEY Fevzi Yilmaz/ Sakarya University Department of Metallurgical and Material Engineering, TURKEY |
|
Twin wire arc sprayed Zn, Al and Zn/Al 85/15 coatings were investigated for comparison of their corrosion resistance, electrochemical behavior and microstructures. The Zn, Al and Zn/Al 85/15 coatings possess prominent electrochemical passivation behavior. Oxide formation mainly onto the coating surfaces were identified with energy-dispersive X-ray analysis and were believed to be responsible for the passivation phenomena observed in the electrochemical polarization. Zn and Al are more negative in electrochemical potential than iron. Zn coatings act as a sacrificial anode and providing cathodic protection. Aluminum shows passive corrosion protection according to stable oxide layer occurs on coating surface. Zn/Al 85/15 coating show two corrosion protection mechanisms together. In this study, steel samples were coated with Zn, Al and Zn/Al 85/15 in optimum conditions by wire arc spraying technique. Coatings were investigated by optical microscopy, scanning electron microscopy (SEM), and analyzed by energy dispersive x-ray technique (EDS). These coatings were investigated behaviors of polarization and corrosion resistance with electrochemical test. After this test, X-ray technique was used according to characterization of corrosion products. Keywords: Twin wire arc spraying, Zn coating, Al coating, Zn/Al 85/15 coating, corrosion, salt spray, potentiostat |