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1262 |
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The effect of process conditions on the microstructure and corrosion resistance of cold sprayed Ti coatings |
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Hong-ren Wang / 1)Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China
2)Graduate School of the Chinese Academy of Sciences, Beijing, 100039, PR China
3)Luoyang Ship Material Reseach Institute; State Key Laboratory For Marine Corrosion and Pro, China Bao-rong Hou / Institute of Oceanology, Chinese Academy of Sciences, China Jun Wang/ State Key Laboratory For Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), China Qi Wang/ State Key Laboratory For Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), China |
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Abstract: Ti and its alloys can be applied to the steels as a protective coating in view of its excellent resistance to corrosive environment. Cold spraying as a new surface engineering technique has potential advantages in Ti coating manufacturing in comparison with conventional thermal spraying techniques. In this paper, Ti coatings were prepared on a carbon steel substrate by cold spraying via controlling the process condition variables concluding carrying gas, temperature and pressure. The microstructure of coatings was observed by SEM. Electrochemical experiments were performed to understand the corrosion behavior of the coatings. The SEM examination showed that the coatings become more compact with increase of molecular weight, pressure and temperature of carrier gases. Potentiodynamic polarization technique was used to measure the corrosion and electrochemical property of coatings deposited under different process conditions and surface conditions. The polarization curves indicated that the coatings which had lower porosity had lower corrosion current. The polishing treatment peeled the rough outer layer including the small pores as well as decreasing of the actual surface area of the coating, leading to the considerable improvement of corrosion resistance. The cold spraying process of Ti coatings was optimized according to the results. Keywords: cold gas dynamic spray; process conditions; Ti coating, microstructure; corrosion resistance |