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Modelling of carbon dioxide corrosion of steel with iron carbonate precipitation

机译：碳酸铁沉淀对钢中二氧化碳腐蚀的模拟

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摘要

Corrosion of mild steel in aqueous solutions containing carbon dioxide was modelled under condition that protective iron carbonate films formed on the steel surface. In this model, the film form on the steel surface due to precipitation of iron carbonate from saturated solution. The precipitation of iron carbonate produces a porous layer on the steel surface, reducing the diffusion of species toward the steel surface. If the precipitation rate is high, the porosity decreases and the mass transport becomes slower. Therefore, formation of protective layers on the steel surface reduces the corrosion rate. In this case, the corrosion processes are controlled with diffusion of species. The model was verified against published experimental data. The model can predict the thickness and the porosity of the film formed on the steel surface and also the corrosion rate of steel under deposited layer. The effects of some parameters such as Fe2+ concentration and temperature on film thickness and corrosion rate were investigated. The developed model is a solid approach for prediction of corrosion rate in conditions that precipitation of iron carbonate occurs on the steel surface.
机译：模拟了低碳钢在含有二氧化碳的水溶液中在钢表面形成保护性碳酸铁膜的条件下的腐蚀情况。在该模型中，由于碳酸铁从饱和溶液中析出，在钢表面形成了膜。碳酸铁的沉淀在钢表面产生了一层多孔层，从而减少了物质向钢表面的扩散。如果沉淀速率高，则孔隙率降低并且传质变慢。因此，在钢表面上形成保护层会降低腐蚀速率。在这种情况下，腐蚀过程通过物质的扩散来控制。针对已发布的实验数据验证了该模型。该模型可以预测在钢表面形成的膜的厚度和孔隙率，以及沉积层下钢的腐蚀速率。研究了Fe 2 + 的浓度和温度等参数对膜厚和腐蚀速率的影响。开发的模型是在钢表面发生碳酸铁沉淀的条件下预测腐蚀速率的可靠方法。

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