Al-5Ti-B-RE细化剂对热浸渗铝层的组织与性能的影响  

The effect of Al-5Ti-B-RE refiner on the microstructure and property of the hot dip aluminized coatings

作　　者：李安敏[1] 胡武[1] 王海超[1] 李松浩[1] 

机构地区：[1]广西大学材料科学与工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2013年第5期1239-1244,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：广西科学基金资助项目(桂科基0991002);广西大学新材料及其制备新技术重点实验室开放基金(GXKFJ11-07;GXKFJ-16);广西大学科研基金资助项目(XBZ100759);2011广西壮族自治区财政专项资助研究生创新计划项目(GXU11T32514);2011年"大学生创新创业训练计划"创新训练项目(110118)

摘　　要：采用熔剂法在Q235钢表面热浸渗铝,并在铝熔体中添加Al-5Ti-B-RE中间合金细化剂,利用金相显微镜、X射线衍射仪、扫描电子显微镜等研究渗铝层的显微组织,运用氧化增重法测试渗铝钢的抗高温氧化性能,以研究细化剂对热浸渗铝层的显微组织和抗高温氧化性能的影响。结果表明:渗铝层都是由表面层和合金层组成;铝液中加入细化剂后,表面层和合金层的厚度都降低,表面层的针状物(FeAl3)细化,合金层的齿状整齐,齿峰分叉减少;随着细化剂含量的增加,渗铝钢的抗高温氧化性能先增加后降低,添加0.3%(质量百分比)细化剂的渗铝钢的抗高温氧化性能最好。In order to study the effects of refiner on the microstructure and the high temperature oxi- dation resistance of the hot dip aluminized coatings, the hot dip aluminized coatings on the surface of Q235 steel were prepared by flux method, and A1-STi-B-RE refiner was added in the aluminum melt. The microstructure of aluminized coating was analyzed by X-ray diffraetometer and scanning e- lectron microscope, and the resistance to high temperature oxidation of aluminized coating was tested by the oxidation weight increase method. The results showed that all the hot dip aluminized coatings were formed by surface layer and alloy layer; the thickness of the coating decreased when refiner was added, and the needles （ FeA13 ） in the surface layer were refined and the dentate alloy layer became thiner, close and less bifurcation ; with the increase of refiner, the high temperature oxidation resist- ance of the aluminized steel increased mitially and then decreased, and the hot dip aluminizing with 0. 3% Al-5Ti-B-RE refiner was the best.

关 键 词：热浸渗铝 Al-5Ti-B-RE 显微组织 抗高温氧化性 

分 类 号：TG174.443[金属学及工艺—金属表面处理]