2A11铝合金/碳钢偶接件在强化自然环境条件下的腐蚀特性

Corrosion Performance of 2A11 Aluminium Alloy Coupled with Carbon Steel in Accelerated Natural Environmental Condition

采用户外周期喷淋试验,研究了2A11铝合金与Q235钢组成的偶接件在强化自然环境条件下的腐蚀行为与规律。结果表明:2A11铝合金的偶接部位发生严重腐蚀,腐蚀严重部位主要在距接触边缘5～10mm的范围内;铝合金的腐蚀质量损失随暴露时间的延长而不断增大;电偶腐蚀和缝隙腐蚀并存是铝合金偶接部位腐蚀严重的主要原因,大气环境中沉积的Cl-以及海水中的Cl-和SO42-共同作用,加速了铝合金的腐蚀。

The corrosion performance of 2All aluminum alloy coupled with Q235 steel under natural environment accelerated test was studied in marine atmosphere. The results show that 2All aluminum alloy appear serious corrosion. The corrosion area of aluminum alloy is mainly within the scope of five millimeters to ten millimeters on the coupled edge. The mass lose increases with increasing of time. The main reason of corrosion of aluminum alloy is galvanic corrosion and gap corrosion. CIfrom atmosphere and seawater and SO42 from seawater act as a stimulus to corrosion of aluminum alloy.