Effect of high-speed laser cladding on microstructure and corrosion resistance of CoCrFeNiMo_0.2 high-entropy alloy

Abstract

In order to study the corrosion resistance of high-speed laser cladding (HLC) coating while improving production efficiency, a CoCrFeNiMo_0.2 high-entropy alloy (HEA) coating was prepared by HLC. The optimized parameters of HLC are laser power of 880 W, scanning speed of 18 m/min, overlapping ratio of 60%, and powder feed speed of 3 r/min. Then, the surface roughness, microstructure, phase composition, element distribution, and electrochemical properties in 3.5 wt% NaCl solution of the coatings were analyzed, respectively. The local surface roughness of the CoCrFeNiMo_0.2 HEA coating was found to be 15.53 µm. A distinct metallurgical bond could be observed between the coating and the substrate. Compared to the conventional laser cladding (CLC), the results of electrochemical tests showed that CoCrFeNiMo_0.2 HEA coating exhibited a significant passivation. The corrosion current density of 5.4411×10⁻⁶ A·cm⁻² and the corrosion potential of −0.7445 V for the HLC coating were calculated by the Tafel extrapolation method. The CLC coating’s corrosion current density and corrosion potential are 2.7083×10⁻⁵ A·cm⁻² and −0.9685 V, respectively. The HLC coating shows a superior corrosion resistance, crucially due to the uniform and fine grains. Under various complex and harsh working conditions, this method can be widely used in the field of repairing and remanufacturing of corrosion-proof workpieces.

Keywords

high-entropy alloy / high-speed laser cladding / microstructure / corrosion resistance

References

[1] YehJ, ChenS, LinS, et al. . Nanostructured high-entropy alloys with multiple principal elements: Novel alloy design concepts and outcomes [J]. Advanced Engineering Materials, 2004, 6(5): 299-303

[2] HuangL, SunY, WangG. Research progress of laser cladding high-entropy alloy coating [J]. Laser & Optoelectronics Progress, 2019, 56(24): 34-41(in Chinese)

[3] RenM, LiB, FuH. Formation condition of solid solution type high-entropy alloy [J]. Transactions of Nonferrous Metals Society of China, 2013, 23(4): 991-995

[4] AnZ, MaoS, YangT, et al. . Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti₂VZrNb_0.5Al_0.5 high-entropy alloy [J]. Science China Materials, 2022, 65(10): 2842-2849

[5] XiaoW, LiK, HanL, et al. . Self-lubricating behavior of Fe₂₂Co₂₆Cr₂₀Ni₂₂Ta₁₀ high-entropy alloy matrix composites [J]. Transactions of Nonferrous Metals Society of China, 2021, 31(3): 744-752

[6] DuY, DingD, GuoN, et al. . The progress of high-entropy alloys with the functional properties [J]. Materials Reports, 2021, 35(17): 17051-17063(in Chinese)

[7] KarimiM A, ShamanianM, EnayatiM H. Microstructural and mechanical properties assessment of transient liquid phase bonding of CoCuFeMnNi high entropy alloy [J]. Transactions of Nonferrous Metals Society of China, 2021, 31(10): 3063-3074

[8] ZhangL, ZhangX, LiN, et al. . Study on thermal shock irradiation resistance of CoCrFeMnNi high entropy alloy by high intensity pulsed ion beam [J]. Journal of Nuclear Materials, 2022, 559: 153413

[9] RenX, ZhangW, WuX, et al. . Prediction of short range order in high-entropy alloys and its effect on the electronic, magnetic and mechanical properties [J]. Acta Physica Sinica, 2020, 6946102-1

[10] TIAN Feng-jie, LIU Wei-jun, SHANG Xiao-feng. Study on green remanufacturing technology based on laser cladding [J]. Manufacturing Technology & Machine Tool, 2009(2): 110–114. DOI: https://doi.org/10.1109/MILCOM.2009.5379889. (in Chinese)

[11] WuY, LiuY, ChenW, et al. . Research status and development direction of extreme high-speed laser material deposition [J]. Electric Welding Machine, 2020, 50(3): 1-10(in Chinese)

[12] ZhangK, BaoJ, WangX. Research on the application of high-speed laser cladding technology [J]. Metallurgy and materials, 2021, 41(4): 66-68(in Chinese)

[13] HuangX, ZhangJ, LianG, et al. . Research status and application of extreme high-speed cladding [J]. Machine Tool & Hydraulics, 2021, 49(6): 151-155(in Chinese)

[14] LouL, ZhangY, XuQ, et al. . Microstructure and properties of metallic coatings with low dilution ratio by high speed laser cladding [J]. China Surface Engineering, 2020, 33(2): 149-159(in Chinese)

[15] ShangX, WangZ, WuQ, et al. . Effect of Mo addition on corrosion behavior of high-entropy alloys CoCrFeNiMo_x in aqueous environments [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 41-51

[16] LiuW H, LuZ P, HeJ Y, et al. . Ductile CoCrFeNiMo, high entropy alloys strengthened by hard intermetallic phases [J]. Acta Materialia, 2016, 116: 332-342

[17] LiuQ, WangX, HuangY, et al. . Effect of molybdenum content on microstructure and corrosion resistance of CoCrFeNiMo high-entropy alloy [J]. Chinese Journal of Materials Research, 2020, 34(11): 868-874(in Chinese)

[18] WangQ, AmarA, JiangC, et al. . CoCrFeNiMo_0.2 high entropy alloy by laser melting deposition: Prospective material for low temperature and corrosion resistant applications [J]. Intermetallics, 2020, 119: 106727

[19] LiuL, ShenF, ZhouY, et al. . Comparison of microstructure and corrosion resistance of 431 stainless steel coatings prepared by extreme high-speed laser cladding and conventional laser cladding [J]. Chinese Journal of Lasers, 2019, 461002010

[20] XuY, SunY, WangG, et al. . Microstructure and properties of iron-based alloys coatings prepared by high-speed laser cladding [J]. Chinese Journal of Lasers, 2021, 48(10): 222-230(in Chinese)

[21] ChandraD. Comparison of physico-mechanical properties of TiO₂ and Cr₂O₃ additives on reaction sintered zirconia-mullite composites [J]. China’s Refractories, 2019, 28(1): 11-21(in Chinese)

[22] WangX, WangJ, FuC. Characterization of pitting corrosion of 7A60 aluminum alloy by EN and EIS techniques [J]. Transactions of Nonferrous Metals Society of China, 2014, 24(12): 3907-3916

[23] XiaH, ZhangC, LvP, et al. . Surface alloying of aluminum with molybdenum by high-current pulsed electron beam [J]. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions With Materials and Atoms, 2018, 4169-15

[24] ChenY, LvP, ZhangS, et al. . Microstructure modification and corrosion resistance of CrFeCoNiMo_0.2 high-entropy alloy induced by high-current pulsed electron beam [J]. Surface Technology, 2020, 49(10): 214-223(in Chinese)

[25] ZhangX, ChenZ, LuoH, et al. . Corrosion resistances of metallic materials in environments containing chloride ions: A review [J]. Transactions of Nonferrous Metals Society of China, 2022, 32(2): 377-410

[26] WangY, WangY, LiR, et al. . Hall-Petch relationship in selective laser melting additively manufactured metals: Using grain or cell size? [J]. Journal of Central South University, 2021, 28(4): 1043-1057

[27] HeY, PengC, WangR, et al. . Effect of extrusion on corrosion behavior of Mg-10Li-5Al-0.02Zr alloy [J]. The Chinese Journal of Nonferrous Metals, 2019, 29(5): 896-905(in Chinese)