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| Electrochemical Corrosion of YG15 Cemented Carbide |
Yuan SHI,Zhuji JIN( ),Guannan JIANG,Zuotao LIU,Zhongzheng ZHOU,Zebei WANG |
| School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China |
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Abstract Cemented carbide is widely used in many fields because of its good properties. However, it is difficult to be processed with traditional machining methods. Electrochemical grinding is a kind of non-traditional method which combines electrochemical machining and mechanical grinding with great processing quality and high removal rate. In this paper, electrochemical corrosion mechanism of YG15 cemented carbide in electrolyte of 3 mol/L NaNO3 is focused by means of potentiodynamic- and potentiostatic-curve measurements. Results show that the electrochemical corrosion of YG15 cemented carbide in NaNO3 electrolyte is the result of co-oxidation corrosion of WC and Co. Corrosion phenomena vary a lot under different potentials. Moreover, when the anode potential is high, the dissolution rate of metal Co (which acts as the binder) increases, leading to the decreasing adhesion of the formed corrosion product scale to the substrate, which makes the corrosion product scale is prone to spall off. In addition, the corrosion dissolution of the substrate and the spall off for the corrosion product scale may cause the current oscillations on curves of corrosion current vs time, which leads to serious corrosion and even destruction of the substrate surface. Therefore, the anode potential should not excess 3.5 VAg/AgCl so that to avoid the above mentioned harmful event during electrochemical grinding. The composition of the corrosion layer is determined to be tungsten oxides (which is mainly WO3) by energy dispersive spectroscope and X-ray photoelectron spectroscope. Reasonable voltage parameters could help increase the removal rate of materials a lot in electrochemical grinding.
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Received: 11 July 2018
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| Fund: National Key Basic Research and Development Program(2015CB057304);Science Challenge Project(JCKY2016212A506-0107);Science Challenge Project(JCKY2016212A506-0103);Science Fund for Creative Research Groups of NSFC(51621064) |
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Corresponding Authors:
Zhuji JIN
E-mail: kimsg@dlut.edu.cn
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