Influence of Aging on Corrosion Resistance of Nano TiC/Ti Refined Al-Zn-Mg-Cu Alloy

Jiang Pingping; Cheng Jingfan; Zhao Bingyi; Liu Bo; Cai Qizhou

doi:10.15980/j.tzzz.2017.05.021

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Influence of Aging on Corrosion Resistance of Nano TiC/Ti Refined Al-Zn-Mg-Cu Alloy
Vol. 37, Issue 5, Pages: 534-538(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.05.021

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[1]江萍萍,程婧璠,赵炳怡,柳波,蔡启舟.时效对纳米TiC/Ti细化Al-Zn-Mg-Cu合金耐蚀性的影响[J].特种铸造及有色合金,2017,37(05):534-538.

Jiang Pingping, Cheng Jingfan, Zhao Bingyi, et al. Influence of Aging on Corrosion Resistance of Nano TiC/Ti Refined Al-Zn-Mg-Cu Alloy. [J]. Special Casting & Nonferrous Alloys 37(5):534-538(2017)
[1]江萍萍,程婧璠,赵炳怡,柳波,蔡启舟.时效对纳米TiC/Ti细化Al-Zn-Mg-Cu合金耐蚀性的影响[J].特种铸造及有色合金,2017,37(05):534-538. DOI： 10.15980/j.tzzz.2017.05.021.

Jiang Pingping, Cheng Jingfan, Zhao Bingyi, et al. Influence of Aging on Corrosion Resistance of Nano TiC/Ti Refined Al-Zn-Mg-Cu Alloy. [J]. Special Casting & Nonferrous Alloys 37(5):534-538(2017) DOI： 10.15980/j.tzzz.2017.05.021.

摘要

采用浸泡腐蚀、极化曲线和应力腐蚀等方法研究时效对纳米TiC/Ti细化Al-Zn-Mg-Cu合金耐蚀性的影响。结果表明

峰时效态和过时效态细化合金在3.5%的NaCl溶液中浸泡192h

腐蚀速率分别为0.756 5mm/a和0.361 3mm/a。峰时效态化合金在NaCl和NaCl+H

溶液中的应力断裂时间分别为72.2h和50.1h;过时效态为221.2h和80.8h

过时效态合金抗应力腐蚀性能高于峰时效态的。峰时效添加TiC/Ti细化合金后晶界较宽的PFZ（无沉淀析出带）降低其耐蚀性

过时效态晶界不连续且粗大的η相以及较窄的PFZ使合金耐蚀性提高。

Abstract

Effects of aging on corrosion behavior of a novel nano TiC/Ti refiner refined Al-Zn-Mg-Cu alloy were investigated by means of soaking corrosion

polarization curve and stress crack corrosion.The results indicate that after soaked in 3.5% NaCl solution for 192 h

the corrosion rate of peak-aged and over-aged Al-Zn-Mg-Cu alloy refined with TiC/Ti reach 0.756 5mm/a and 0.361 3mm/a respectively.The fracture time of stress crack corrosion are 72.2h and 50.1h with the peak-aged alloy refined with TiC/Ti at NaCl and NaCl+H

solution

respectively

while at over-aged

they are 221.2h and 80.8h

respectively.The resistance of stress crack corrosion at over-aged is the higher than that of ones at peak-aged.The wider PFZ can decrease significantly the corrosion resistance of alloy refined with TiC/Ti at peak-aged

however

at over-aged

the coarse and discontinuous phase preciphated from grain boundary and the narrow PFZ can improve the corrosion resistance.