使用430不锈钢于680至800℃下作熔融铝硅合金热浸处理,研究热浸温度及热浸时间对铝硅合金化层成长的影响及铝化层之成长动力学.结果表明,430不锈钢在680~800℃经热浸16~289 s后,表面镀层与铝化层之生成厚度随热浸时间及热浸温度而增加,铝化层之成长动力学符合抛物线定律,并因相互扩散而形成FeA l3及Fe2A l5相,金相截面观察显示,680℃热浸处理的合金化层界面平坦,而在800℃下的即趋于不规则.
The 430 stainless steels have been hot dipped in the molten Al-6.5%Si melts from 680 to 800℃, respectively. The effects of the hot dipping temperature and time on the thickness of the internal alloy layer have been investigated. The activation energy of the growth kinetic of aluminized layer was also calculated. The results showed that the thickness of aluminized layer increased with increasing dipping time and temperature. Besides, the growth kinetic of aluminized layer obeys parabolic rate law. The FeAl_(3 )and Fe_(2)Al_(5 )were formed by the inward diffusion, and the interface of intermetallic layer will be rugged and rough at the 800℃ more than 680℃.
[1]Ch inese Standards CNS 9998,Hot-d ip A lum inum CoatedSted Steets and Strips[S].1983.
[2]Capuano G A,Dang A,Bernabai U,et al.H igh-tem-perature oxidation and therm al cyc ling of alum inum-ete-co-p lated stain less steels[J].Oxidation of M etals,1993,39:263~276.
[3]Hong Sun-li(洪舜立).The study of hot d ipp ing com-m erc ial pure alum inum onto low carbon steel[D].Tai-be i:Taiwan Institute of Technoloty,1985.
[4]Sh igeak iu Kobyash i,Takao Yakou.Control of interm etal-lic compound layes at interface between steel and alum i-num by d iffusion-treatm ent[J].M aterials Sc ience andEngineering,2002,A338:44~53.
[5]Eggler G,VogelH,Kaesche H.Target preparation fortransm ission electron m icro identification ofA l3Fe phasein hot-d ip alum in ized low-alloy steel[J].ParketM etal-logr,1985,22:162~173.
[6]Bahadur A,Mohanty O N.Structureal stud ies of hot d ipalum in ized coatings on m ild steel[J].M aterials Trans-actions,JIM.,1991,32:1053~1061.
[7]R ichards R W,Jones R D,C lem ents P D,et al.M etal-lurgy of continuous hot d ip alum in izing[J].Internation-alM aterials Reviews,1994,39:191~198.
[8]Tortoric i P C,Dayananda M A.Phase form ation and in-terd iffusion in A l-c lad 430 stain less steels[J].M aterialsSc ience&Engineering,1998,A244:207~215.
[9]An J,L iu Y B,Zhang M Z,et al.E ffect of S i on theinterfac ial bond ing strength ofA l-Pd alloy strips and hot-d ip alum in ized steel sheet by hot rolling[J].Journal ofM aterials Processing Technology,2002,120:30~36.
