摘要
为了寻找Al-Mg-Mn合金力学性能和耐剥蚀性能的最佳组合,采用对比法探索Sc和Zr对Al-Mg-Mn合金力学性能和剥落腐蚀性能的影响,测定了含与不含微量Sc和Zr的Al-Mg-Mn合金板材在不同退火态的力学性能和剥落腐蚀性能,测量了它们的极化曲线。采用扫描电镜观察了合金的腐蚀微观形貌、用能谱仪分析了腐蚀产物的成分。采用光学显微镜和透射电子显微镜分析了合金的显微组织和力学性能、剥落腐蚀性能之间的关系。结果表明:添加微量Sc和Zr能显著提高Al-Mg-Mn合金强度,改善合金强度和塑性的配合,而且Sc和Zr的添加没有引起合金耐剥蚀性能的明显下降。经过350℃/1h退火的Al-Mg-Mn-Sc-Zr合金具有优良的力学性能和耐蚀性能组合。可通过添加微量Sc,Zr,减少Mg的含量,选择合理的退火工艺,使该类合金的力学性能和耐剥蚀性能达到理想组合。
To quest for the best combination of mechanical properties and exfoliation corrosion resisting property of Al-Mg-Mn base alloys, and to seek after the effect of Sc and Zr on mechanical and exfoliation corrosion properties of Al-Mg-Mn alloys, comparision was made, the mechanical properties of Al-Mg-Mn alloys with and without minor Sc and Zr treated by different annealing were measured, the degrees of exfoliation corrosion for these alloys through accelerated exfoliation corrosion test were evaluated, and polarization curves of these alloys were measured. The micromorphologies of corrosion specimens were observed by SEM and the corrosion product was analyzed using EDS. Optical microscope and TEM were used, the relationship between their microstructures and mechanical properties, exfoliation corrosion resisting property was investigated, and the results show that the addition of minor Sc and Zr can enhance the strength greatly and also improve the combination of strength and plasticity. Moreover, the addition of minor Sc, Zr does not cause appreciable decrease of exfoliation corrosion resistence, the Al-Mg-Mn-Sc-Zr alloy annealed at 350 ℃ for 1 h has excellent combination of mechanical properties and exfoliation corrosion resistence, the satisfied combination of mechanical properties nad exfoliation corrosion resistence can be obtained by means of adding minor Sc and Zr, decreasing the content of Mn, and adopting reasonable annealing practice.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第2期217-222,共6页
Journal of the Chinese Society of Rare Earths
基金
国家重点基础研究发展规划项目973计划(G1999064911)资助项目
