Effect of Si on Microstructure and Corrosion Behavior of CoCrMo Alloys

9th International Conference on Mechatronics and Manufacturing

机械制造;无线电电子学

Peaubuapuan, Chonlawit^1 ; Tunthawiroon, Phacharaphon^1 ; Kanlayasiri, Kannachai^1 ; Yuangyai, Chumpol^1

Department of Industrial Engineering, Faculty of Engineering, King Mongkut's Institute of Technology, Ladkrabang, Bangkok

10520, Thailand^1

关键词: Corrosion current densities;    Corrosion parameters;    Corrosion potentials;    Corrosion resistant properties;    Optical microscopes;    Polarization curves;    Polarization tests;    Potentiodynamic polarization measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/361/1/012004/pdf
DOI  :  10.1088/1757-899X/361/1/012004

来源: IOP

【 摘 要 】

The aim of this research was to investigate the effect of silicon (Si) on the microstructure and corrosion behavior of CoCrMo alloys. The concentration of Si added in CoCrMo alloys was 0.1, 0.5 and 1 wt %. The corrosion behavior of the present alloys was investigated using potentiodynamic polarization measurements. The normal saline solution with 0.9 wt % was used as an electrolyte. Polarization curves obtained from the polarization test were used to evaluate in terms of corrosion current density (icorr ), corrosion potential (Ecorr ) and corrosion parameters that be used to compute corrosion resistant property of CoCrMo alloys. The microstructure of a sample during the polarization test was compared using X-ray diffraction (XRD) and optical microscope (OM). The results indicated that the increase in Si slightly changed the microstructure of CoCrMo alloys and could enhance the resistance to corrosion of CoCrMo alloys in NaCl solution. In addition, the reduction of Cr and Mo concentration in CoCrMo alloys was found to be a significant influence on the decrease in corrosion resistance.