We investigated the relationship between amine structure and corrosion rates in a study of the corrosion behaviour of carbon steel in CO₂-loaded 4-amino-1-propyl-piperidine (4A1PPD) solution and a series of related amines. Electrochemical measurements showed that 4A1PPD displayed the lowest corrosion rate of the amines studied, and that the corrosion rate decreased with the increase of the number of substituents on amino groups and a structural change from linear amines to cyclic amines. We also carried out a hydrothermal corrosion study using selected amines to analyse the surface morphology and composition formed on the surface of corroded carbon steel. The results suggested that the formation of a protective film was dependant on the ratio of bicarbonate/carbamate species. We confirmed that a dense FeCO₃ protective film was produced on the carbon steel surface after hydrothermal corrosion treatment with CO₂ rich 4A1PPD solution. Our results demonstrate that the 4A1PPD designer amine with a cyclic structure shows good corrosion properties for use in post-combustion CO₂ capture and resulted in significantly reduced corrosion on carbon steel compared to the benchmark amine, monoethanolamine.

在研究碳钢在CO ₂负载的4-氨基-1-丙基-哌啶（4A1PPD）溶液和一系列相关胺中的腐蚀行为的研究中，我们研究了胺结构与腐蚀速率之间的关系。电化学测量表明，4A1PPD表现出所研究胺类的最低腐蚀速率，并且腐蚀速率随着氨基上取代基数量的增加以及从线性胺到环状胺的结构变化而降低。我们还使用选定的胺进行了水热腐蚀研究，以分析腐蚀的碳钢表面上形成的表面形态和成分。结果表明保护膜的形成取决于碳酸氢盐/氨基甲酸酯种类的比率。我们确认了致密的FeCO经过富CO _2的4A1PPD溶液的水热腐蚀处理后，在碳钢表面上形成了_3个保护膜。我们的结果表明，具有环状结构的4A1PPD设计胺显示出良好的腐蚀性能，可用于燃烧后的CO ₂捕集，与基准胺单乙醇胺相比，碳钢的腐蚀显着降低。