首页|冷却速率对含锂7xxx铝合金抗剥落腐蚀性能的影响

冷却速率对含锂7xxx铝合金抗剥落腐蚀性能的影响

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采用加速浸泡、电化学阻抗谱测试、光学显微镜、电子背散射衍射和扫描透射电镜等方法，研究固溶热处理后冷却速度对含锂7xxx铝合金抗剥落腐蚀性能的影响。随着冷却速率从1700℃/s降低到4℃/s，时效试样的抗剥落腐蚀性能下降，等级从EA变为EC，最大腐蚀深度从169。4 μm增加到632。1 μm。在冷却速率大于31℃/s的试样中，剥落腐蚀倾向于沿晶界发展;在冷却速率较低的试样中，剥落腐蚀倾向于沿晶界和亚晶界发展。从缓慢冷却引起的晶界和亚晶界组织和微化学变化的角度分析了差异原因。
Impact of cooling rate on exfoliation corrosion resistance of a Li-containing 7xxx aluminum alloy
The impact of cooling rate after solution heat treatment on exfoliation corrosion resistance of a Li-containing 7xxx aluminum alloy was investigated by accelerated immersion and electrochemical impedance spectroscopy test,optical microscope,electron backscatter diffraction and scanning transmission electron microscope.With the decrease of cooling rate from 1700℃/s to 4℃/s,exfoliation corrosion resistance of the aged specimens decreases with rating changing from EA to EC and the maximum corrosion depth increasing from about 169.4 μm to 632.1 μm.Exfoliation corrosion tends to develop along grain boundaries in the specimens with cooling rates higher than about 31℃/s and along both grain boundaries and sub-grain boundaries in the specimens with lower cooling rates.The reason has been discussed based on the changes of the microstructure and microchemistry at grain boundaries and sub-grain boundaries due to slow cooling.

7xxx aluminum alloycooling rateexfoliation corrosionmicrostructure

姜科达、廖泽鑫、陈明扬、刘胜胆、唐建国

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School of Materials Science and Engineering,Central South University,Changsha 410083,China

National Key Laboratory of Science and Technology on High-strength Structural Materials,Central South University,Changsha 410083,China

Key Laboratory of Non-ferrous Metals Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China

7xxx铝合金 冷却速度 剥落腐蚀 微观组织

Major Science and Technology Projects of the Science and Technology Department of Yunnan Province,ChinaNational Natural Science Foundation of China

202302AB080024U21A20130

2024

10.1007/s11771-024-5702-8

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(7)