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采用热浸镀技术在Q235A钢基体表面制备了厚约2mm、且与基体冶金结合的镍基合金涂层,并对其进行热处理。采用XRD和SEM分别研究了涂层的相组成和组织,在冲蚀磨损试验机上测定了涂层的抗冲蚀磨损性能。结果表明,所制备的镍基合金涂层以Ni2.9Cr0.7Fe0.36(fcc)相和CrB相为主,还存在少量的Fe23(C,B)6相。热处理后,涂层组织由原来不同形态的析出物转变成点块状CrB硬质相,这些硬质相弥散分布在γ-Ni固溶体上。热处理后,结合界面处铁、镍发生了互扩散,使过渡带由原来的5～8μm变为20μm。冲蚀耐磨试验显示,热处理后涂层的磨损量减少了50%,提高了镍基合金涂层的抗冲蚀磨损性能。
Hot dip coating technology was used to prepare a Ni-based alloy coating with a thickness of about 2mm on the surface of Q235A steel substrate and metallurgically bonded with the substrate. The Ni-based alloy coating was heat treated. The phase composition and microstructure of the coating were investigated by XRD and SEM. The erosion and wear properties of the coating were measured on an erosion tester. The results show that Ni2.9Cr0.7Fe0.36 (fcc) phase and CrB phase are the predominant Ni-based alloy coatings, and a small amount of Fe23 (C, B) 6 phases exist. After heat treatment, the microstructure of the coating changed from precipitates of different forms to massive CrB hard phases, which were dispersed in the γ-Ni solid solution. After heat treatment, interdiffusion of iron and nickel occurred at the interface, and the transition band changed from 5 ~ 8μm to 20μm. Erosion wear tests showed that the amount of wear of the coating after heat treatment was reduced by 50% and the erosion wear resistance of the nickel-based alloy coating was improved.