| ZHANG Guojian,CHENG Xiyun,JI Xiulin,LU Yixun,CHEN Junwei,LI Cilin,HU Yangdong.Microstructure and Properties of FeCoNiCr0.5Al0.2 High Entropy Alloy Coating with Different Layers Fabricated by Laser Cladding[J],53(21):187-197 |
| Microstructure and Properties of FeCoNiCr0.5Al0.2 High Entropy Alloy Coating with Different Layers Fabricated by Laser Cladding |
| Received:November 15, 2023 Revised:May 23, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.21.019 |
| KeyWord:laser cladding high entropy alloy coating number of layers dilution rate wear resistance corrosion resistance |
| Author | Institution |
| ZHANG Guojian |
College of Engineering, Shantou University, Guangdong Shantou , China |
| CHENG Xiyun |
College of Engineering, Shantou University, Guangdong Shantou , China |
| JI Xiulin |
College of Engineering, Shantou University, Guangdong Shantou , China |
| LU Yixun |
College of Engineering, Shantou University, Guangdong Shantou , China |
| CHEN Junwei |
College of Engineering, Shantou University, Guangdong Shantou , China |
| LI Cilin |
College of Engineering, Shantou University, Guangdong Shantou , China |
| HU Yangdong |
College of Engineering, Shantou University, Guangdong Shantou , China |
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| Abstract: |
| The harsh service environment of offshore wind power equipment makes the wear and corrosion of its components very serious, especially the corrosion of offshore wind turbine tower. FeCoNiCr0.5Al0.2 high entropy alloy coatings were prepared on the surface of Q345 steel, a commonly used material for tower tubes, by laser cladding technology, and their tribological properties were investigated in air and 3.5% NaCl simulated seawater solution. The effects of the number of coating layers on microstructure, hardness, dilution rate, wear rate and polarization curves were investigated by studying the microstructure, dilution rate, hardness, dilution rate, abrasion and corrosion resistance of the high entropy alloy coatings with different numbers of layers. The high entropy alloy coating realized excellent metallurgical bonding with the base Q345 steel. The number of coating layers increased from 1 to 5, the Fe element content on the surface of the coating gradually decreased from 66.72% to 30.46%, and the dilution rate decreased from 37.7% to 9.8%, the surface of the coating mainly consisted of fine isometric crystals and columnar organization, and the phase structure gradually changed to simple FCC phase with the increase of the number of coating layers. The hardness of the 1-layer coating was the highest, which was 422HV0.5, about 3.5 times that of the substrate. When the number of coating layers was greater than 3, the average hardness of the coating was 190HV0.5, which was about 1.5 times of that of the substrate. The wear rate of the coating in both air and 3.5% NaCl solution was lower than that of the Q345 steel substrate. In air, the coatings with 1, 3 and 5 layers, compared to the substrate, showed a 37.1%, 23.3%, and 26.3% decrease in wear rate at 10 N load, and 21.0%, 8.4%, and 11.7% decrease in wear rate at 20 N load, respectively. In 3.5% NaCl solution, the wear rate of coatings with 1, 3 and 5 layers, compared to the substrate, decreased by 45.5%, 38.4% and 40.2% respectively at 10 N load, and 47.7%, 43.9% and 42.4% respectively at 20 N. The wear rate of the coatings in air at 10 N and 20 N loads was 6 and 4.5 times higher than that of the coatings in the 3.5% NaCl solution around. The corrosion potentials of the coatings were all higher than the corrosion potential of the substrate, and the corrosion current density was also lower than that of the substrate. Compared with the substrate, the corrosion potentials of the coatings with 1, 3 and 5 layers were elevated by 11.9%, 57.6% and 50.2%, respectively, and the corrosion current density decreased by one to two orders of magnitude, among which, the 3-layer coatings had the highest corrosion potentials, the corrosion current density decreased by two orders of magnitude, and the capacitive arc resistance and impedance values were larger, demonstrating good corrosion resistance. With the increasing number of layers in FeCoNiCr0.5Al0.2 high entropy alloy coating, the dilution rate decreases, the hardness increases and the wear resistance and corrosion resistance are greatly enhanced. According to the different performance needs, the coatings with different number of layers can be selected and multi-layer high entropy alloy coatings are expected to act as a protective coating for equipment in service in the marine environment. |
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