Ag含量对Al-Cu-Li合金晶间腐蚀行为的影响

方成栋; 杨瑞宾; 王飞舟; 刘忠侠

doi:10.15980/j.tzzz.2016.05.025

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Ag含量对Al-Cu-Li合金晶间腐蚀行为的影响
Effects of Ag Content on Intergranular Corrosion Resistance of Al-Cu-Li Alloy
2016年36卷第5期页码：532-535
纸质出版日期： 2016 ，
DOI： 10.15980/j.tzzz.2016.05.025

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[1]方成栋,杨瑞宾,王飞舟,刘忠侠.Ag含量对Al-Cu-Li合金晶间腐蚀行为的影响[J].特种铸造及有色合金,2016,36(05):532-535.

Fang Chengdong, Yang Ruibin, Wang Feizhou, et al. Effects of Ag Content on Intergranular Corrosion Resistance of Al-Cu-Li Alloy[J]. Special Casting & Nonferrous Alloys, 2016,36(5):532-535.
[1]方成栋,杨瑞宾,王飞舟,刘忠侠.Ag含量对Al-Cu-Li合金晶间腐蚀行为的影响[J].特种铸造及有色合金,2016,36(05):532-535. DOI： 10.15980/j.tzzz.2016.05.025.

Fang Chengdong, Yang Ruibin, Wang Feizhou, et al. Effects of Ag Content on Intergranular Corrosion Resistance of Al-Cu-Li Alloy[J]. Special Casting & Nonferrous Alloys, 2016,36(5):532-535. DOI： 10.15980/j.tzzz.2016.05.025.

摘要

通过盐水浸泡法与电化学腐蚀试验

研究了4种Ag含量的T6态Al-Cu-Li合金的晶间腐蚀性能。发现随着Ag含量的增加

合金的自腐蚀电位下降

自腐蚀电流密度增加

晶间腐蚀深度逐渐增加

因此

Ag的添加降低了T6态合金的抗晶间腐蚀能力。原因在于含Ag合金析出的具有较低电位的大量T

相和较宽的PFZ;同时Ag促使T

相周围吸附更多的Mg原子团簇

增加了T

相与基体的电位差。

Abstract

The intergranular corrosion resistance of the Al-Cu-Li alloys contained Ag contents at T6 state was investigated by immersing testing in salt solution and electrochemical experiment.The results reveal that

with the increase of Ag content

the self-corrosion potential of the alloys is decreased while the self-corrosion current density is increased.And the depth of corrosion pits is increased accordingly also.Therefore

the addition of Ag in Al-Cu-Li alloys can result in the decreases of corrosion resistance.The addition of Ag can increase T

phase and the width of precipitation free zone（PFZ）.Furthermore

the addition of Ag can promote the absorption of Mg cluster near the T

phase.The lower standard electrochemical potential thanα-Al phase can result in the increase of the electrochemical potential difference between T

phase andα-Al.