Abstract
Influence of solid solution temperature on microstructures and corrosion properties of CoNiCrMo alloy were investigated by means of optical microscopy (OM), scanning electron microscope (SEM) and electronic differential system. The corrosion resistance of CoNiCrMo alloy in 0.9%NaCl aqueous solution was also investigated. The results indicated that with the increase of solution treatment temperature, the dendrites of CoNiCrMo alloy gradually disappeared. Thus, the corrosion resistance of the alloy decreased. When the solution temperature is 1200oC, the dendrites almost disappeared and most carbide dissolved, and begins to spheroidization. The corrosion resistance of CoNiCrMo alloy treated at 1000oC for 1h is the highest than the one at 1100 oC and 1200oC. Its self-corrosion potential is -424mV and self-corrosion current density is 1.02×10-8A/cm2.
Highlights
Co-based alloys that have excellent comprehensive properties, such as high temperature fatigue resistance, low thermal expansion coefficient, heat corrosion resistance and wear resistance, good biocompatibility, high mechanical properties and high thermal conductivity, were widely used in the fields of military, chemical industry, energy and Bioengineering 1-3.At present, the researches on biomedical metal materials have become a hot spot in the global material industry 4-6
Co-based alloy has stronger corrosion resistance and the similar biocompatibility compared with stainless steel, and the abrasive resistance of Co-based alloys is the best among all biomedical metal materials
Some studies 10-13 indicated that Co-based alloys are very sensitive to heat treatment process, and different treatment temperature and holding time during the solution and aging will greatly affect the microstructures, mechanical properties and corrosion resistance of this alloy
Summary
Co-based alloys that have excellent comprehensive properties, such as high temperature fatigue resistance, low thermal expansion coefficient, heat corrosion resistance and wear resistance, good biocompatibility, high mechanical properties and high thermal conductivity, were widely used in the fields of military, chemical industry, energy and Bioengineering 1-3. Some studies 10-13 indicated that Co-based alloys are very sensitive to heat treatment process, and different treatment temperature and holding time during the solution and aging will greatly affect the microstructures, mechanical properties and corrosion resistance of this alloy. It was found that the intensities of Cr23C6, TiN and VC diffraction peaks were gradually improved as aging temperature increased.The. According to above references, Co-based alloys have excellent comprehensive properties used in biomedical field. The CoNiCrMo alloy will be studied in this paper It is lack of no systematic report on the effect of different heat treatment conditions on the microstructures and corrosion properties of CoNiCrMo alloy. The effect of solid solution temperature on the microstructures and corrosion properties of CoNiCrMo alloy will be deeply studied, and the mechanism of heat treatment process on the corrosion resistance of CoNiCrMo alloy will be clarified
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