晶粒组织对7475铝合金晶间腐蚀性能的影响  

Effect of Grain Structure on Intergranular Corrosion Resistance of 7475 Aluminum Alloy

作　　者：黄明初[1] 

机构地区：[1]中南大学材料科学与工程学院有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《矿冶工程》2010年第6期97-99,共3页Mining and Metallurgical Engineering

摘　　要：采用金相显微镜、透射电镜、腐蚀浸泡试验和极化曲线测试研究了晶粒组织对7475铝合金抗晶间腐蚀能力的影响。结果表明:部分再结晶较完全再结晶的7475铝合金有更正的腐蚀电位,更小的腐蚀电流,以及更小的晶间腐蚀深度;因此具有更好的抗晶间腐蚀能力。部分再结晶的7475铝合金中再结晶区域与未再结晶区域在法向上呈层状分布,未再结晶组织中包含大量的亚晶界,一定程度延缓晶间腐蚀的发展,从而提高合金的抗晶界腐蚀能力。The effect of grain structure on the intergranular corrosion resistance of 7475 aluminum alloy was investigated by optical microscopy, transmission electron microscopy, corrosion immersion test and polarization curve testing. The results showed that the partially-recrystallized 7475 Al alloy exhibited more positive corrosion potential, lower corrosion current and smaller intergranular corrosion depth than the completely-recrystallized 7475 Al alloy. Thus, the former alloy had better intergranular corrosion resistance. In this alloy, the recrystallized and unrecrystallized zones showed layered distribution along normal direction. The subgrain boundaries contained in the unrecrystallized zone could retard the occurrence of corrosion, thus improved the intergranular corrosion resistance.

关 键 词：晶粒组织 7475铝合金 晶间腐蚀 

分 类 号：TG146.4[一般工业技术—材料科学与工程]