王一丹,张学润,崔秀芳,金国,温鑫.激光能量密度对NiCrCoTiV高熵合金涂层组织结构及耐蚀性能的影响[J].表面技术,2019,48(6):118-124.
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].Surface Technology,2019,48(6):118-124 |
| 激光能量密度对NiCrCoTiV高熵合金涂层组织结构及耐蚀性能的影响 |
| Effects of Laser Energy Density on Microstructure and Corrosion Resistance of NiCrCoTiV High Entropy Alloy Coating |
| 投稿时间：2018-12-12 修订日期：2019-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.012 |
| 中文关键词: 激光熔覆 高熵合金 能量密度 物相组成 微观组织 耐蚀性 |
| 英文关键词:laser cladding high-entropy alloy energy density phase microstructure corrosion resistance |
| 基金项目:国家自然科学基金资助项目（51775127，51575118） |
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| Author | Institution |
| WANG Yi-dan | Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
| ZHANG Xue-run | Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
| CUI Xiu-fang | Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
| JIN Guo | Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
| WEN Xin | Institute of Corrosion Science and Surface Technology, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China |
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| 中文摘要: |
| 目的 探究激光能量密度对NiCrCoTiV高熵合金涂层组织结构及耐腐蚀性能的影响。方法 以Ti-6Al-4V为基体材料，通过激光熔覆手段，在四种不同激光参数条件下制备了NiCrCoTiV高熵合金涂层。利用扫描电子显微镜（SEM）及X射线衍射仪（XRD）表征了高熵合金涂层的物相组成及显微组织。通过电化学测试系统对涂层的耐腐蚀性能进行了分析。结果 采用激光熔覆技术方法成功在Ti-6Al-4V基体表面制备出NiCrCoTiV高熵合金涂层，其微观组织均由BCC高熵合金相、α-Ti相和(Ni,Co)Ti2相组成。由于稀释作用，涂层中出现了黑色的富钛稀释相。随着激光能量密度的减小，黑色相尺寸和总面积减小，分布更均匀。激光密度为53 J/mm2制得的涂层稀释率最低，固溶程度良好。NiCrCoTiV高熵合金涂层在3.5%NaCl溶液中的钝化区间基本相同，激光密度为53 J/mm2制得的涂层自腐蚀电位最大，为-0.262 V，自腐蚀电流密度最小，为1.3705×10-7 A/cm2，其抵抗均匀腐蚀能力最优。此外，NiCrCoTiV高熵合金涂层在NaCl+H2SO4的混合溶液中仍具有相对较好的耐腐蚀性能，自腐蚀电流密度达到了10-6~10-4 A/cm2数量级。结论 激光能量密度会直接影响NiCrCoTiV高熵合金涂层的组织结构及耐蚀性能。激光能量密度越低，涂层的晶粒越细，相分布更均匀，耐蚀性能越好。 |
| 英文摘要: |
| 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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