沿海城镇天然气管道焊接接头腐蚀与防护的研究进展

Research Progress on Corrosion and Protection of Natural Gas Pipeline Welds in Coastal Towns

管道焊接接头作为天然气输送管道的薄弱环节,在具有强腐蚀性的沿海土壤环境中更易发生腐蚀失效现象。综述了我国沿海城镇天然气管道焊接接头的腐蚀因素和主要腐蚀类型,介绍了目前主要的管道防护技术,包括添加缓蚀剂、防腐蚀涂层、改善腐蚀环境以及阴极保护等。最后,结合目前氢能综合利用需求逐渐提升情况,分析了混氢天然气管道所面临的焊缝焊接接头氢脆风险,并对未来研发阻氢涂层,保障混氢天然气管道长周期安全服役的关键技术进行了展望。

As the weak link of natural gas transmission pipeline,the welded joints of pipeline are more prone to corrosion failure in the highly corrosive coastal soil environment.The corrosion factors and main corrosion types of welded joints of natural gas pipelines in coastal towns in China are reviewed,and the main pipeline protection technologies are introduced,including adding corrosion inhibitor,anti-corrosion coating,improving corrosion environment and cathodic protection.Finally,combined with the increasing demand for comprehensive utilization of hydrogen energy,the risk of hydrogen embrittlement in welded joints of hydrogen mixed natural gas pipelines is analyzed,and the key technologies for developing hydrogen resistant coatings to ensure the long-term safe service of hydrogen mixed natural gas pipelines in the future are prospected.