Influence of Grain Refiner on Corrosion Properties of Aluminium Substrate Presensitized Plate
HUANG Yuan-chun1,2, SONG Man-xin2,3, XIAO Zheng-bing2,3, ZHANG Yun-ya2,3
1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. Light Alloy Research Institute, Central South University, Changsha 410083, China;
3. School of Materials Science and Engineering, Central South University, Changsha 410083, China
Abstract：By using electrochemical workstations, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other means,the effects of two kinds of grain refiners, Al-5Ti-1B and Al-5Ti-0.2C, on microstructures and properties of 1050 aluminum presensitized plate were investigated. The results show that there are numerous coarse second-phase particles containing Fe and Si in the cast-rolling board added Al-5Ti-1B. There are second phase particles and tangled dislocations in presensitized plate, which result in strong local corrosion and ununiformity of corrosion holes. However, in the cast-rolling board added Al-5Ti-0.2C,the second-phase particles containing Fe and Si, are relatively smaller and more uniform, without aggregation. The second-phase particles in presensitized plate are in small dispersion and uniform distribution, which lead to the acceleration of electrochemical corrosion and more uniform corrosion. For the plate added Al-5Ti-0.2C, the properties of electrolytic corrosion were improved.
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