LNG接收站不锈钢管道涂装设计与优化研究

Study on Coating Design and Optimization of Stainless Steel Pipelines in LNG Terminal

LNG接收站中大部分管道为不锈钢材质。在特定的环境下,会出现点蚀、应力腐蚀、晶间腐蚀等现象。加强对不锈钢防腐涂层体系的科学设计,优化涂装方案,对LNG接收站安全稳定运行具有重要意义。本文分析了沿海和内陆大气环境下发生不锈钢腐蚀的机理。从油漆类型、表面处理方式、涂层厚度等方面进行了涂装设计,通过低表面处理漆的附着力试验,优化了保冷不锈钢的涂装方案。

Most of the pipelines in the LNG terminal are made of stainless steel.Under certain circumstances,pitting corrosion,stress corrosion cracking and intergranular corrosion will occur.Strengthening the scientific design of stainless steel anticorrosive coating system and optimizing the coating scheme are of great significance to the safe and stable operation of LNG terminals.This paper analyzes the corrosion mechanism of stainless steel in coastal and inland atmospheric environments.According to the paint type,surface treatment method,coating thickness and other aspects,the corresponding coating designs are carried out.Through the adhesion test of the surface–tolerant coating,the cold preservation stainless steel coating scheme is optimized.