论文部分内容阅读
通过5种典型大气环境下为期20年的现场暴露试验,研究了LY12铝合金在我国长期大气腐蚀的规律和行为。结果表明,LY12在湿热的万宁和琼海分别暴露6年和10年后就发生了剥蚀,暴露20年后几乎丧失了力学性能,而在北京暴露20年后未出现剥蚀,仍保持良好的力学性能。LY12在大气污染物较多的江津和青岛腐蚀失重较大,在北京的腐蚀失重最小。剥蚀发生之前,LY12的腐蚀失重随暴露时间的变化遵循幂函数C=KT~n。剥落腐蚀产物中除Al屑之外主要为γ-Al(OH)_3和α-Al_2O_3·3H_2O。
Through five kinds of typical atmospheric environment for a period of 20 years of field exposure test, the law and behavior of long-term atmospheric corrosion of LY12 aluminum alloy in China were studied. The results showed that LY12 was denuded in both wet and hot Mannings and Qionghai respectively for 6 years and 10 years after exposure. After exposure for 20 years, LY12 almost lost its mechanical properties, while it remained intact after 20 years of exposure in Beijing Mechanical properties. LY12 is more corrosive in Jiangjin and Qingdao, where air pollutants are more corrosive, with less corrosion loss in Beijing. Before denudation occurs, the corrosion loss of LY12 follows the power function C = KT ~ n with the change of exposure time. Exfoliation corrosion products in addition to Al flakes mainly γ-Al (OH) _3 and α-Al_2O_3 · 3H_2O.