摘要
采用恒温浸泡方法、金相和透射电镜技术研究2297合金经不同的时效工艺后的晶间腐蚀和剥落腐蚀行为。研究结果表明:时效时间越长,2297合金的腐蚀敏感性越大;在相同时效时间上,T8态合金的腐蚀敏感性要高于T6态合金的腐蚀敏感性。随着时效时间的延长,合金晶界的PFZ宽度降低,析出相发生粗化,并由断续排列变为连续排列。晶界析出相的特征是影响2297合金腐蚀敏感性的主要因素。粗大的析出相,并呈连续分布,合金的腐蚀敏感性越大;细小的析出相,并呈断续分布,合金的腐蚀敏感性越小。
The intergranular corrosion and exfoliation corrosion properties of 2297 aluminum alloy were investigated at different aging treatment using constant temperature immersion corrosion method, optical microscopy and transmission electron microscopy. The results show that the corrosion sensibility of 2297 aluminum alloy increases gradually with the increase of aging time. In the same aging time, the corrosion sensitivity of T8 state alloy is higher than that of T6 state alloy. With the increase of aging time, the width of PFZ in grain boundary reduced, the precipitated phase coarsened, and the feature of precipitated phase would change from intermittent distribution to continuous distribution. The feature of grain boundary precipitated phase is the major factor in affecting the corrosion sensitivity of 2297 aluminum alloy. Coarse precipitation phase with continuous distribution can increase the corrosion sensitivity of alloy, fine precipitation phase with intermittent distribution can decrease the corrosion sensitivity of alloy.
出处
《铝加工》
CAS
2016年第1期4-10,共7页
Aluminium Fabrication
关键词
2297铝合金
时效工艺
晶间腐蚀
剥落腐蚀
2297 AI ahoy
aging treatment
intergranular corrosion
exfoliation corrosion
