Abstract Pipelines are efficient in transporting natural gas over large distances. Wet carbon dioxide present in pipelines can create an environment that is corrosive to steel. Polymer liners made from either polyethylene or polyamide (nylon) are presently used to mitigate internal corrosion in natural gas pipelines. Gas diffuses through all polymers over time, and polymer-only liners lower the steel corrosion rate by reducing the reactive gas flux to the internal surface of a pipeline. Composite liners, which incorporate one or more metallic layers that are impermeable to corrosive gases, offer better protection than polymer-only liners. We measured the methane, water vapor, and carbon dioxide permeability of a multi-layer barrier film and found it to be more effective in resisting gas permeation than polyethylene and nylon-11 films. The composite barrier film was more effective in protecting steel coupons immersed in a mixture of gaseous methane and wet carbon dioxide at 1 and 24 atm compared with polyethylene and polyamide films.

中文翻译：

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金属聚合物复合阻隔衬里对钢质管道的腐蚀保护

摘要 管道在远距离输送天然气方面非常有效。管道中存在的湿二氧化碳会造成腐蚀钢铁的环境。由聚乙烯或聚酰胺（尼龙）制成的聚合物衬里目前用于减轻天然气管道的内部腐蚀。随着时间的推移，气体会扩散到所有聚合物中，而仅使用聚合物的内衬通过减少进入管道内表面的反应性气体流量来降低钢的腐蚀速率。复合衬里包含一层或多层不透腐蚀性气体的金属层，比纯聚合物衬里提供更好的保护。我们测量了多层阻隔膜的甲烷、水蒸气和二氧化碳渗透率，发现它比聚乙烯和尼龙 11 薄膜更有效地阻止气体渗透。