冷凝器用铝黄铜管开裂原因分析

Analysis on Cracking Reason of Aluminium Brass Tube for Condenser

通过宏观检验、化学成分分析、金相组织检验、残余应力试验以及电镜微观观察等方法对冷凝器用铝黄铜管开裂原因进行分析。结果表明,由于铝黄铜管热处理过程中去应力退火不充分,加上后期酸洗过程中未冲洗干净,残留有部分酸洗液,在应力和腐蚀介质的共同作用下,造成冷凝器用铝黄铜管的应力腐蚀开裂。

By means of macroscopic examination, chemical composition analysis, metallographic structure test, residual stress test and electron microscopic observation, the causes of cracking of aluminium brass tube for condenser were analyzed.The results show that, the annealing of aluminum brass pipe during heat treatment is not sufficient, and the acid washing solution is not washed out during the later pickling process, some acid lotions remain. Under the joint action of stress and corrosion medium, the stress corrosion cracking of aluminium brass tube for condenser is caused.