空调连接管的一种典型腐蚀失效分析

摘要

A typical ant-nest corrosion was confirmed in the TP2 copper tube of air conditioner connecting pipe by SEM, EDS, ion chromatography and Optical Microscopy. And acceleration simulation test indicates that carboxylate radical was produced in insulating pipe (foamed plastics) under 80ml deionized water at 90 ℃. With copper added, the elementary carboxylate radical increased faster. Moreover, the ant-nest corrosion reappeared in copper tube with mixing foamed plastics. This ant-neat corrosion was different from ordinary ones. The corrosive media( carboxylic acid) is not from fats and oils, but from the foamed plastics which is stable under normal conditions. The results above can provide some references for future design.%利用扫描电镜、能谱、离子色谱、金相显微镜对失效空调连接管进行检测，确认连接管中TP2铜管泄漏失效为典型的蚁巢腐蚀，模拟加速实验表明：保温管、铜+保温管置入80 mL去离子水、90℃条件下，保温管(发泡塑料)产生了羧酸根，铜的加入，加速了羧酸根的形成。利用发泡塑料，成功复现出蚁巢腐蚀。此类蚁巢腐蚀与常见的蚁巢腐蚀有所差异，腐蚀媒介(羧酸)不是由油脂类提供，而是常规情况下性质稳定的发泡塑料产生，可为以后的产品设计提供一定的借鉴。