助镀处理对Q235钢热浸镀铝层耐高温性能的影响  

Influence of Fluxing Agent Treatment on High Temperature Resistance of Aluminized Coating on Q235 Steel

作　　者：王明静[1] 朱明[1] 张慧慧[1] 徐征 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054

出　　处：《材料保护》2017年第8期58-59,76,共3页Materials Protection

基　　金：陕西省科技新星项目(2013KJXX-42);西安科技大学培育基金(6310214005);西安科技大学博士启动金(6310115012)资助

摘　　要：为了获得Q235钢表面热浸镀铝的最优助镀剂配方,将Q235钢经过打磨、除油、除锈、助镀等前处理后进行热浸镀铝及镀后扩散热处理,以试样的抗高温氧化性能为指标设计正交试验对助镀剂配方进行优选,通过扫描电镜及能谱仪分析了镀层主要构成,通过高温氧化试验考察了镀层的抗高温氧化性能。结果表明:助镀剂的最佳配比为:200.0 g/L ZnCl_2,10.0 g/L NaNO_3,1.1 g/L CrO_3,25.0 g/L NaF,30.0 g/L CrO_3,0.2 g/L KMnO_4,且其中ZnCl_2的含量对试样抗高温氧化性能影响最显著。所得镀层主要成分为铁元素和铝元素,组织致密,抗高温氧化性能优良。Q235 steel after different pretreatment procedures including polishing oil-removal,rust-removal,assistant plating and so on,was hot-dipped with aluminum.Afterwards,the high temperature resistance of the samples was tested.The optimal pretreatment process was achieved by calculating and analyzing the data from orthogonal experiment.The morphology and main composition of the aluminized coating were analyzed by SEM ad EDS.Furthermore,the high temperature resistance was tested through high temperature test.Results showed that the main composition of the coating was Fe and Al,and the coating structure was dense.Besides,the best ratio of fluxing agents was as follows：ZnC12 200.0 g/L,NaNO3 10.0 g/L,CrO3 1.1 g/L,NaF 25.0 g/L,CrO3 30.0 g/L and KMnO4 0.2 g/L.The content of ZnCl2 was the most significant factor to the high temperature oxidation resistance of the samples.

关 键 词：助镀剂 热浸镀铝 高温氧化性能 正交试验 

分 类 号：TG174.443[金属学及工艺—金属表面处理]