ABSTRACT Iron boride coatings obtained by the CVD-based thermal diffusion process are proposed and evaluated for the first time for high-temperature corrosion and scaling conditions in geothermal power generation. The testing results in different corrosion environments are presented. The influence of structure and surface composition on the materials’ performance is demonstrated. The dual-layer boride-based coatings successfully withstand the actions of high temperature/high pressure water and steam with a presence of H2S, CO + CO2, chlorides and hydrocarbons in simulating conditions and strong acidic environments. They demonstrated minimal scaling and corrosion when the materials were immersed into the modelling mixes of chloride salt solutions with SiO2 or SiO2+Fe2O3 at elevated temperatures and into the brine solution at boiling. These advanced ceramic coatings and technology should promote significant extension of the steels’ service life in harsh geothermal-related corrosion environments.

中文翻译：

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先进的硼化铁涂层可提高地热发电钢的耐腐蚀性

摘要首次提出并评估了通过基于 CVD 的热扩散工艺获得的硼化铁涂层，用于地热发电中的高温腐蚀和结垢条件。给出了在不同腐蚀环境下的测试结果。证明了结构和表面成分对材料性能的影响。双层硼化物基涂层在模拟条件和强酸性环境中成功承受高温/高压水和蒸汽的作用，其中存在 H2S、CO + CO2、氯化物和碳氢化合物。当材料在升高的温度下浸入氯化物盐溶液与 SiO2 或 SiO2+Fe2O3 的建模混合物中并浸入沸腾的盐水溶液中时，他们证明了最小的结垢和腐蚀。