采用热浸镀铝的方法在20碳钢上分别制备了不同La含量的热浸镀铝涂层,通过高温氧化试验以及测量孔洞平均直径和形核数量随氧化时间的变化,研究了La含量对渗铝层/基体界面孔洞生长的影响规律.结果表明,渗铝层/基体界面孔洞的生长可划分为快速生长和稳定生长两阶段.在快速生长阶段,当La含量小于0.5wt%时,随La含量的增加,渗铝层/基体界面孔洞的生长速度逐渐减小;当La含量大于0.5wt%时,随La含量的增加,界面孔洞的生长速度逐渐增大.在稳定生长阶段,渗铝层/基体界面孔洞的生长速度随La含量的变化规律与热浸镀铝后合金层厚度随La含量的变化规律相吻合.分析了La含量对渗铝层/基体界面孔洞生长的影响机理.
The aluminized coating with different La content on low carbon steel 20 was prepared by hot dip aluminizing method. The effect of La content on the formation and growth of voids along the interface between the aluminized coating and steel substrate of aluminized steel were investigated by means of cyclic oxidation test and measuring variations of average size and number of the voids with oxidation time. The results show that the growth of the voids can be divided into two stages of fast growth and stable growth. At the stage of fast growth, the growth speed of the voids decreases gradually with the increasing of La content at 0 ～ 0.5wt% , but the growth speed of the voids increases when the content is more than 0.5wt% . At the stage of stable growth, the variation regulation of the growth speed of the voids with La content are in accord with the variation regulation of the thickness of the alloy layer after hot dip aluminizing with La content. The influence mechanism of La content on the growth of the voids is also analyzed.
参考文献
| [1] | 杨世伟,李莉,李里,崔李萍.不锈钢热浸镀铝抗高温氧化性能研究[J].材料热处理学报,2002(04):51-53. |
| [2] | 杨世伟,吴锦维,崔李苹.奥氏体钢热浸镀铝抗高温氧化腐蚀性能的研究[J].哈尔滨工程大学学报,2003(02):198-200. |
| [3] | 郑毅然,高文禄.热浸镀铝钢材的应用与发展[J].腐蚀科学与防护技术,1999(03):179-184. |
| [4] | 王德庆,于金龙,段旭东.钢铁表面热浸镀铝技术回顾[J].大连铁道学院学报,2003(03):77-83. |
| [5] | 张伟,文九巴,龙永强,王杰敏,范志康.渗铝钢扩散层空洞对循环氧化和剥落性能的影响[J].材料热处理学报,2004(06):96-100. |
| [6] | 张伟,文九巴,龙永强,范志康.高温下渗铝层次外层/过渡层界面空洞带的形成过程[J].材料热处理学报,2005(04):106-110. |
| [7] | ZHANG Wei;FAN Zhi-kang;HU Peng-fei et al.Effects of rare earth on void band of diffusion layer and properties of aluminized steel[J].Journal of Iron and Steel Research Intemational,2006,13(05):60-64. |
| [8] | 武汉材料保护研究所.钢铁化学热处理金相图谱[M].北京:机械工业出版社,1980:70-73. |
| [9] | 张伟,文九巴,王晓峰,熊飞,催新安.热浸镀铝钢扩散层的AlFe3C0.5相[J].中国有色金属学报,2007(10):1632-1636. |
| [10] | 杨云;余宗森 .稀土对Zn-5%Al合金与钢板湿润性的影晌[J].中国稀土学报,1993,11(03):242-246. |
| [11] | 张伟 .钢热浸镀铝层的组织结构和稀土镧的行为研究[D].西安理工大学,2006. |
| [12] | 刘正;吕振家 .稀土表面处理的空位机制[J].科学通报,1991,36(12):951-954. |
| [13] | 王兴庆;隋永江 .铁铝原子在金属问化合物形成中的扩散[J].上海大学学报(自然科学版),1998,4(02):661-667. |
| [14] | 冯瑞.金属物理学[M].北京:科学出版社,1987:521-535. |
| [15] | Heumann T;Dittrich N A.Structure character of the Fe_2Al_5,intermetallics compound in hot dip aluminizing process[J].Zeitschrift fur Metallkunde,1959(50):617-625. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%