QPQ处理对27SiMn合金钢堆焊镍铝青铜合金涂层组织与性能的影响  

Effect of QPQ Treatment on the Microstructure and Properties of Nickel-Aluminum-Bronze Alloy Coating of 27SiMn Alloy Steel

作　　者：宿友亮[1] 崔昊 郜雪楠 郑浩博 SU Youliang;CUI Hao;GAO Xuenan;ZHENG Haobo(School of Mechanical Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏大学机械工程学院,宁夏银川750021 [2]宁夏大学化学化工学院,宁夏银川750021

出　　处：《华南理工大学学报(自然科学版)》2025年第3期105-115,共11页Journal of South China University of Technology(Natural Science Edition)

基　　金：宁夏回族自治区重点研发计划项目(2022BSB03096)。

摘　　要：针对淬火-抛光-淬火(QPQ)处理对27SiMn合金钢堆焊的镍铝青铜合金涂层性能影响不明确的问题,该文开展了铜合金涂层的几何特征、组织变化、耐蚀性能和硬度检测等的研究,探讨QPQ处理工艺对铜合金涂层组织与性能的影响,以验证该复合防腐工艺的合理性和可行性。结果表明:碳/氮化与氧化两道工序后,铜合金涂层形成了一种双层结构的渗层,其中金属碳化物跨越双层结构分布,铜的氧化物只在近表层分布,起防腐作用;QPQ处理前后的堆焊铜合金组织均有基体相α、亚稳定相β',以及分散于α相中的多种κ相;高、中温回火作用,致使β'相大量析出α相,基体相融合增大,整体硬度下降;铜合金堆焊层试样表面的耐蚀性保护评级为9级,铜合金堆焊层QPQ处理试样表面的耐蚀性保护评级为10级,QPQ处理后的铜合金表面的耐蚀性并未降低,反而超过了未经处理前的情况。该复合防腐技术在提升缸筒内壁耐蚀性的同时,又兼顾接头孔等其他部位及缸体外表面的耐蚀性,可应用于此类缸筒零部件的维修再制造。To address the unclear effects of quenching-polishing-quenching(QPQ)treatment on the performance of nickel-aluminum bronze alloy coatings welded onto 27SiMn alloy steel,this study investigated the geometric characteristics,microstructural changes,corrosion resistance,and hardness of the copper alloy coating.The influence of the QPQ treatment process on the coating’s microstructure and properties was analyzed to verify the rationality and feasibility of this composite anti-corrosion technology.The results indicate that after undergoing the two processes of carbonization/nitriding and oxidation,the copper alloy coating forms a dual-layer infiltration structure,with metal carbides distributed across both layers and copper oxides concentrated near the surface,providing corrosion protection.Before and after QPQ treatment,the microstructure of the copper alloy coatings primarily consists of the matrix phaseα,the metastable phase,and variousκphases dispersed within theαphase.High-and medium-temperature tempering leads to the precipitation of a large amount ofβ'phase into theαphase,causing the matrix phase to coalesce and expand while reducing overall hardness.According to the protection rating representation method based on the proportion of substrate area affected by corrosion,the protection rating of the surface of the copper alloy coatings layer samples is 9,while the copper alloy samples after QPQ treatment is 10.The corrosion resistance of the copper alloy surface after QPQ treatment is not only maintained but also exceeds that of the untreated one.In light of this,the composite anti-corrosion technology can be applied to the maintenance and remanufacturing of hydraulic bracket cylinder barrel parts,which can enhance the corrosion resistance of the inner wall of the cylinder barrel as a whole,while also considering the corrosion resistance of other parts such as the joint holes and the outer surface of the cylinder body.

关 键 词：淬火-抛光-淬火处理 表面熔铜 复合涂层 立柱油缸 防腐 

分 类 号：TG178[金属学及工艺—金属表面处理]