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| Thermal-sprayed coating of optimally mixed ceramic powders on stainless steel with enhanced corrosion resistance |
| Ping-hu Chen1,2 �� Zhi-lin Liu1,2 �� Rui-qing Li2,3 �� Chang-jun Qiu4 �� Xiao-qian Li1,2,3 |
1 College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
2 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, Hunan, China
3 Light Alloy Research Institute, Central South University, Changsha 410083, Hunan, China
4 College of Mechanical Engineering, University of South China, Hengyang 421001, Hunan, China |
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Abstract Three different groups of ceramic powders for the thermal-sprayed coating were fi rstly prepared using sintering and ball milling. Then, these powders were separately deposited on three stainless steel substrates, followed by individual corrosion resistance examination. Microstructural characterization showed that the levels of micro-void and micro-crack at the bonding interface (between coating and substrate) depended on the proportions of different ceramic particles. Meanwhile, a signifi cantly enhanced corrosion resistance was reproducibly observed in one group of as-coated samples that have the optimal combination of given ceramic powders. Furthermore, the mechanism of corresponding enhanced corrosion resistance was discussed. It was found that the optimal ceramic powders for the present thermal-sprayed coating should contain 30.2 wt% SiO2, 54 wt% Cr2O3, 6.8 wt% Al2O3, 4.8 wt% CaO and 1.8 wt% TiO 2. The corrosion velocities of such samples .2 in the 3.5 vol.% HCl, 15 wt% NaOH and 5 wt% NaCl solutions were 3.74, 2.98 and 0.50 g h .1 m for 168, 336 and 336 h, respectively.
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Received: 18 April 2017
Published: 16 May 2018
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2018, Vol. 25 
