热处理对冷喷涂铁基非晶涂层耐腐蚀性能的影响  

Influence of heat treatment on corrosion resistance of cold-sprayed Fe-based amorphous coatings

作　　者：张香云[1] 丁国强 袁子洲[1] Zhang Xiangyun;Ding Guoqiang;Yuan Zizhou(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《金属热处理》2025年第3期270-276,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(52061024,52161027);兰州理工大学红柳优秀青年人才支持计划。

摘　　要：采用冷喷涂的方法在ZK60A镁合金表面成功制备了Fe基非晶涂层Fe_(78)Si_(9)B_(13),并对其进行低于晶化温度(494℃)的不同温度(300、350、400和450℃)保温30 min的热处理,利用维氏显微硬度计、电化学工作站、扫描电镜等对涂层的硬度、耐腐蚀性及其机理进行了研究。结果表明,Fe_(78)Si_(9)B_(13)涂层结构致密,孔隙率为2.73%,非晶率为92.6%,维氏硬度(836.2 HV0.2)远高于镁合金(68 HV0.2),在SBF溶液中涂层的腐蚀速率(0.55 mm/a)明显优于ZK60A镁合金(9.15 mm/a)。涂层热处理后,随热处理温度提高,耐蚀性先增加再降低。350℃热处理涂层的耐蚀性最优,自腐蚀电位为-0.684 V,腐蚀速率0.26 mm/a。在SBF中浸泡30 d后涂层表面的Ca与P元素比值非常接近羟基磷酸钙中的比值,具有一定的生物活性。The Fe-based amorphous coating,Fe_(78)Si_(9)B_(13),was successfully prepared on the surface of ZK60A magnesium alloy using the cold spray method.The coating was then heat-treated below its crystallization temperature(494℃)at different temperatures(300,350,400 and 450℃)for 30 min.The hardness,corrosion resistance and corresponding mechanisms of the coatings was investigated by using Vickers microhardness testing,electrochemical workstation and scanning electron microscope(SEM).The results show that the Fe_(78)Si_(9)B_(13) coating has a dense structure,with a porosity of 2.73%and an amorphous fraction of 92.6%.The Vickers hardness of 836.2 HV0.2 is much higher than that of the magnesium alloy(68 HV0.2).In the SBF solution,the corrosion rate of the coating(0.55 mm/a)is significantly better than that of the ZK60A magnesium alloy(9.15 mm/a).After heat treatment,the corrosion resistance of the coating first increases and then decreases with the increase of heat treatment temperature.The coating treated at 350℃has the best corrosion resistance,with self-corrosion potential of-0.684 V and corrosion rate of 0.26 mm/a.After soaking in SBF for 30 days,the ratio of Ca to P elements on the surface of the coating is very close to that in hydroxyapatite,indicating a certain biological activity.

关 键 词：冷喷涂 Fe基非晶涂层 热处理 耐腐蚀性 ZK60A镁合金 

分 类 号：TG178[金属学及工艺—金属表面处理]