输卤管道绝缘法兰高电位端腐蚀的减缓方法

The method used to slow down the corrosion of a long-distance brine pipeline on the high potential side of insulation flange

埋地输卤管道中卤水介质的高矿化度及强腐蚀性使得管道表面受绝缘法兰两端电位差的影响从而形成局部电化学腐蚀电池,绝缘法兰高电位端管道作为电池阳极更易出现严重的腐蚀穿孔.针对该问题,采用电化学方法进行模拟实验,探讨绝缘法兰两端电位差、绝缘段长度和管径对腐蚀速率的影响,并提出相应的解决措施.结果表明:采用降低电位差、增加绝缘段长度以及减小管径等方法均能减缓绝缘法兰高电位端管道的腐蚀.

Owing to the high salinity and strong corrosiveness of the brine medium,the potential difference between the two sides of insulation flange makes the pipeline forming a local electrochemical corrosion cell.The high potential side becomes a battery anode,so pipeline occurs severe corrosion and perforation.In order to slow down the corrosion,electrochemical techniques are employed to investigate the influence of factors on the corrosion rate,including the potential differences between the both sides of the insulation flange,the lengths of insulation flange and the diameters of the pipeline.Corresponding methods are proposed to slow down the corrosion rate.The results show that the pipeline corrosion rates of the high potential side will slow down with the decrease of potential differences,the increase of insulation section length and the decrease of the pipeline diameter.