Abstract Increase of corrosion resistance after the injection of oxygen was clearly observed in the electrochemical tests. Fe2O3 caused by additional oxidation of Fe3O4 during the injection of oxygen filled the space of the original Fe3O4, and it decreased the porosity of the oxide layer. It indicates that this transient oxygen injection method can improve the corrosion resistance in a carbon steel pipeline of a district heating system covered by an Fe3O4 oxide layer. Thus, this method would be promising eco-friendly treatment for operating district heating system because it does not need the artificial chemicals and suitable for long-time used system.

中文翻译：

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瞬态注氧法提高区域供热环境低碳钢管道耐腐蚀性能

摘要 在电化学测试中可以清楚地观察到注入氧气后耐腐蚀性能有所提高。注入氧气时Fe3O4的额外氧化产生的Fe2O3填充了原有Fe3O4的空间，降低了氧化层的孔隙率。这表明这种瞬态注氧方法可以提高覆盖有 Fe3O4 氧化层的区域供热系统碳钢管道的耐腐蚀性能。因此，由于该方法不需要人工化学品，并且适用于长期使用的系统，因此该方法将有望对运行中的区域供热系统进行环保处理。