CAJ | 학술논문

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。
채용용제법재Q235강표면열침삼려，병재려용체중첨가Al-5Ti-B-RE중간합금세화제，이용금상현미경、X사선연사의、소묘전자현미경등연구삼려층적현미조직，운용양화증중법측시삼려강적항고온양화성능，이연구세화제대열침삼려층적현미조직화항고온양화성능적영향。결과표명：삼려층도시유표면층화합금층조성；려액중가입세화제후，표면층화합금층적후도도강저，표면층적침상물（ FeAl3）세화，합금층적치상정제，치봉분차감소；수착세화제함량적증가，삼려강적항고온양화성능선증가후강저，첨가0.3％（질량백분비）세화제적삼려강적항고온양화성능최호。
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 Al-5Ti-B-RE refiner was added in the aluminum melt.The microstructure of aluminized coating was analyzed by X-ray diffractometer 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 ( FeAl3 ) 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.