| WANG Yi-dan,ZHANG Xue-run,CUI Xiu-fang,JIN Guo,WEN Xin.Effects of Laser Energy Density on Microstructure and Corrosion Resistance of NiCrCoTiV High Entropy Alloy Coating[J],48(6):118-124 |
| Effects of Laser Energy Density on Microstructure and Corrosion Resistance of NiCrCoTiV High Entropy Alloy Coating |
| Received:December 12, 2018 Revised:June 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.012 |
| KeyWord:laser cladding high-entropy alloy energy density phase microstructure corrosion resistance |
| Author | Institution |
| WANG Yi-dan |
Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| ZHANG Xue-run |
Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| CUI Xiu-fang |
Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| JIN Guo |
Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
| WEN Xin |
Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
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| Abstract: |
| The work aims to study the effect of laser energy density on microstructure and corrosion resistance of NiCrCoTiV high entropy alloy coating. NiCrCoTiV coatings were prepared by laser cladding with Ti-6Al-4V as the matrix material under four different laser parameters. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical testing system were used to characterize and analyze the phase composition, microstructure and corrosion resistance of the coatings. NiCrCoTiV high entropy alloy coating was successfully prepared on Ti-6Al-4V substrate by laser cladding technology. The NiCrCoTiV coating was composed of BCC high-entropy alloy phase, α-Ti phase and (Ni,Co) Ti2 phase. As a result of the dilution, black ti-rich diluent phase appeared in the coating. With the decrease of laser energy density, the size and total area of black phase decreased and the distribution, became more uniform. The coating prepared with laser density of 53 J/mm2 had the lowest dilution rate and good solid solubility. The passivation interval of NiCrCoTiV high-entropy alloy coating in 3.5% NaCl solution was basically the same. The coating prepared with laser density of 53 J/mm2 had the highest free-corrosion potential, -0.262 V, and the free-corrosion current density is the smallest, 1.3705×10-7 A/cm2. The corrosion resistance was the best. In addition, NiCrCoTiV coating still had relatively good corrosion resistance in NaCl+H2SO4 mixture solution. The free-corrosion current density reached 10-6~10-4 A/cm2 magnitude. The microstructure and corrosion resistance of NiCrCoTiV high entropy alloy coating are directly affected by the laser energy density. The lower laser energy density results in thinner grain size, more uniform phase distribution and better corrosion resistance. |
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