摘要
为降低钢在铝液中的腐蚀,通过对比纯铝、Al-Si、Al-Sn、Al-Mg铝合金熔体静态腐蚀作用下Q235钢/熔体界面的结构、形貌和腐蚀速率,研究了Si、Sn、Mg元素对Q235在铝合金熔体中静态腐蚀的影响。结果表明:Q235在不同铝合金熔体中均发生腐蚀,表面均形成Fe_2Al_5金属间化合物层,在铝液中添加Si可以使形成的Fe_2Al_5层由舌状转变为平板状,减小Fe_2Al_5层厚度,并显著减缓腐蚀速率;添加Sn和Mg不改变Fe_2Al_5层的形态和厚度,减缓腐蚀速率效果不如Si显著;Si、Sn、Mg不改变Fe_2Al_5择优生长的特点;Si降低腐蚀速率的机制是阻塞Fe_2Al_5空位孔道抑制原子扩散;Sn、Mg降低腐蚀速率的机制是占位阻隔减缓扩散速率。
By comparing the structure, morphology and corrosion behaviors of Q235 steel/liquid alloy interface in various static molten alumi- num alloys （ pure Al, Al-Si, Al-Sn or Al-Mg）, the effects of Si, Sn and Mg on the corrosion behavior of Q235 steel in static molten aluminum alloy were studied. Results showed that Q235 steel was corroded in all of molten alloys, and the intermetallie compound layer Fez AlS was formed on the Q235 steel surface. By adding Si to liquid aluminum, the morphology of Fe2Als layer changed from tongue-like to plat-like, and its thickness became thinner, and meanwhile the corrosion rate significantly slowed down. By adding Sn or Mg into liquid aluminum, the mor- phology and thickness of Fe2Al5 layer did not change, and the corrosion rate slowed down less than that of Si. In addition, Si, Sn and Mg had not changed the preferential growth of Fe2Al5 layer. Furthermore, the mechanism of Si reducing corrosion rate was that Si atom blocked chan- nels in Fe2Al5 to inhibit diffusion of atoms, while that of Sn and Mg reducing corrosion rate was that Sn and Mg atom occupied position of aluminum to inhibit diffusion of atoms as barrier.
作者
王晓亮
古缘
刘忆
鲍亚楠
杨绍斌
WANG Xiao-liang1＇2, GU Yuan3, LIU Yi2, BAO Ya-nan1, YANG Shao-bin1(1. College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China; 2. Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control, Xuzhou 221111, China; 3. Weihai Swirl Technology Co., Ltd., Weihai 264200, Chin)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第2期42-46,共5页
Materials Protection
基金
江苏省大型工程装备检测与控制重点建设实验室开放项目(JSKLEDC201505)
辽宁工程技术大学第四批生产技术问题创新研究基金(23160003T)资助
