摘要
采用常温浸泡方法和质量损失法研究了加入不同含量（0.5～2.0 mass%）的Sn对Mg-6 mass%Al合金在0.5 mass%NaCl溶液中腐蚀行为的影响,采用扫描电镜观察了合金的腐蚀形貌,采用光学显微镜对合金的显微组织进行了观察。结果表明：合金的腐蚀形貌与腐蚀速率测试结果具有较强的一致性;不含Sn时,Mg-6Al合金的腐蚀速率为0.985 mm/a,随着Sn含量从0.5%增加到2.0%,Mg-6Al合金的腐蚀速率先降低后升高;当Sn含量为1.0%时,Mg-6Al合金的腐蚀速率达到最低,为0.568 mm/a,此时合金的耐腐蚀性能最好,这主要是由于向Mg-6Al合金中加入适量的Sn后,可细化合金的显微组织,同时降低腐蚀速率,并且改善腐蚀形貌,进而显著提高合金的耐腐蚀性能。
Effect of 0.5 mass%-2.0 mass% Sn addition on corrosion behavior of Mg-6 mass%Al alloy in 0.5 mass% NaCl solution was studied by immersion corrosion test at room temperature and mass loss method. The corrosion morphology and microstructure of the alloys were observed by scanning electron microscopy and optical microscope, respectively. The results show that the corrosion morphology of the alloys has strong consistency with the corrosion rate test results. The corrosion rate of the Mg-6 Al alloy without Sn is 0.985 mm/a, and with the increase of Sn content from 0.5 mass% to 2.0 mass%, the corrosion rate of the alloys decreases at first and then increases. When the addition amount of Sn is 1.0 mass%, the corrosion rate of the Mg-6 Al-1 Sn alloy reaches the lowest, which is 0.568 mm/a, and the corrosion resistance is the best, this is mainly due to the addition of proper amount of Sn into the Mg-6 Al alloy, which can refine the microstructure of the alloy, reduce the corrosion rate and improve the corrosion morphology, thereby significantly improving the corrosion resistance of the alloy.
作者
张清
朱利敏
李全安
ZHANG Qing;ZHU Li-min;LI Quan-an(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Province Collaborative Innovation Center of Nonferrous Metals,Luoyang 471023,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第11期17-21,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1404501)
关键词
镁合金
SN
显微组织
腐蚀
magnesium alloy
Sn
microstructure
corrosion
