低温液体储罐爆破片腐蚀失效分析

Corrosion Failure Analysis of Bursting Disc for Cryogenic Liquid Tank

海南文昌发射场高温、高湿、高盐雾的环境特点,使其地面设备极易遭受腐蚀,特别是在距离海岸线1 km以内的区域,不锈钢也存在严重的点蚀情况。采用宏观观察与微观观察相结合的方法,对一起低温液体储罐爆破片失效的原因进行了分析。结果表明,由于止回阀反向密封性能较差,在海洋大气腐蚀环境中,无法有效地隔绝Cl^-与爆破片的接触,使爆破片外表面发生点蚀,并最终造成腐蚀穿孔。

Ground equipment of Wenchang space launching site at Hainan province is apt to suffer from corrosion because of the high temperature, high humidity and high salt-containing marine atmosphere there, especially for the areas within 1 km from the coastline, even stainless steels also suffer from serious pitting corrosion. Failure analysis of a bursting disc for a cryogenic liquid tank is carried out by means of macroscopic-and microscopic-observation. Results show that due to the poor reverse sealing performance of the check valve, the Cl^- containing marine atmosphere can easy reach the relevant place, causing pitting corrosion on the outer surface of the bursting disc, and ultimately causing the corrosion perforation.