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《Journal of South China University of Technology(Natural Science Edition)》 2016-06
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Effect of Rolling Deformation on Quench Sensitivity to Exfoliation Corrosion of Thick Al-5Zn-3Mg-1Cu-0.12Zr Alloy Plate

LI Dong-feng;ZHANG Xin-ming;YIN Bang-wen;LIU Sheng-dan;LEI Yue;DENG Yun-lai;School of Materials Science and Engineering,Central South University;School of Mechanical Engineering,Hunan Institute of Engineering;Key Laboratory of Nonferrous Metals Materials of the Ministry of Education,Central South University;  
This paper deals with the effect of rolling deformation on the quench sensitivity to the exfoliation corrosion( EXCO) of thick Al-5Zn-3Mg-1Cu-0. 12 Zr alloy plates by means of end-quenching testing,corrosion immersion testing,optical microscopy and transmission electron microscopy. The results show that( 1) the resistance to EXCO of the plate decreases with the decrease in cooling rate,and the decrement of EXCO resistance increases with the increase in hot rolling deformation,which means that there exists an increasing quench sensitivity to EXCO;( 2) when the rolling deformation ranges from 56% to 91%,the exfoliation corrosion levels of all the samples are P at a quench rate of 2 160 ℃ / min,while the level varies from EA to ED at a quench rate of 100 ℃ / min;( 3)when the rolling deformation is 56%,72%,81% and 91%,the exfoliation corrosion level is EA or deeper than EA at the quench rates of more than 100,159,209 and 320 ℃ / min; and( 4) under a constant rolling deformation,the precipitate free zone will be widened with the decrease of quench rate,which may result in the degradation of the exfoliation corrosion resistance.
【Fund】: 国家重点基础研究发展计划项目(2012CB619500);; 国际科技合作专项(2013DFG51890)~~
【CateGory Index】: TG339
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