FPSO海水压载舱涂层系统及锌合金牺牲阳极阴保系统失效分析和解决方案  

Failure Analysis of Zinc Alloy Sacrificial Anode Cathodic Protection System and Coating System for Seawater Ballast Tank of FPSO

作　　者：张国庆[1] 吕建伟[1] 熊睿[1] 周迎春 Zhang Guoqing;Lv Jianwei;Xiong Rui;Zhou Yingchun(Offshore Oil Engineering Co,Ltd,Tianjin 300451,China)

机构地区：[1]海洋石油工程股份有限公司,天津300451

出　　处：《涂层与防护》2024年第2期23-28,共6页Coating and Protection

摘　　要：分析了大于50℃条件下海洋石油工程FPSO海水压载防腐涂层失效及阴极保护失效的原因。基于高温环境下锌合金牺牲阳极的失效原因分析、涂层失效分析,结合阳极接触电阻测量、阳极材料化学成分分析、腐蚀产物分析(钝化层)以及对其实际使用环境的模拟等手段,确认导致该环境下防腐涂层失效及牺牲阳极阴保系统失效的主要原因,为该使用环境下的防腐设计和阳极材料选择提供风险分析,避免类似失效风险,避免由于该问题引发的停产及重大安全事故。This paper analyzes the failure of anticorrosive coating failure and zinc alloy sacrificial anode used in seawater ballast tank of offshore oil engineering FPSO at temperatures more than 50℃.Based on the measurement of anode contact resistance,analysis of the chemical composition of anode materials and the corrosion products(passivation layer),and the simulation of the actual working environment,the main reasons leading to the failure of the anticorrosive coating in this environment and the failure of the zinc anode cathodic protection system are confirmed.The risk analysis is provided for the corrosion control design and anode material selection in this environment to avoid similar failure risks.It can avoid shutdown and major safety accidents caused by this problem.

关 键 词：压载舱 锌阳极 失效原因分析 极性反转 浮式生产储油装置 

分 类 号：TQ630.72[化学工程—精细化工]