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首页> 外文期刊>Applied Surface Science >Iron carbonate formation kinetics onto corroding and pre-filmed carbon steel surfaces in carbon dioxide corrosion environments
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Iron carbonate formation kinetics onto corroding and pre-filmed carbon steel surfaces in carbon dioxide corrosion environments

机译：在二氧化碳腐蚀环境中腐蚀和预成膜的碳钢表面上碳酸铁的形成动力学

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摘要

This work investigates the Corrosion Layer Accumulation Rate (CLAR) of iron carbonate (FeCO3) onto X65 carbon steel in carbon dioxide containing environments using the direct method of corrosion layer mass gain measurement. Glass cell experiments were performed at 80 degrees C and pH 6.3 or 6.8 over a range of bulk FeCO3 saturation ratios using both actively corroding carbon steel and steel pre-filmed with FeCO3. The CLARs obtained from experiments using actively corroding samples displayed strong agreement with the most recently developed precipitation model by Sun and Nesic at high supersaturation for pH 6.3 and 6.8, but a disparity at low supersaturation for the solution at pH 6.8. The observed discrepancy was attributed to the significant difference in surface saturation ratio between the two conditions when the steel is actively corroding. CLARs determined for pre-FeCO3 filmed carbon steel show that the kinetics of FeCO3 formation reduce significantly once the film establishes a protective barrier at lower values of bulk supersaturation. The results highlight the contrast between surface layer accumulation kinetics in the early stages of growth and those encountered in the long-term after the development of a protective film.
机译：这项工作使用直接测量腐蚀层质量增益的方法，研究了含二氧化碳的环境中X65碳钢上碳酸铁（FeCO3）的腐蚀层累积速率（CLAR）。使用主动腐蚀的碳钢和预涂有FeCO3的钢，在80摄氏度，pH 6.3或6.8的条件下，在一定的整体FeCO3饱和比范围内进行玻璃电池实验。从使用主动腐蚀样品的实验中获得的CLARs与Sun和Nesic最新开发的降水模型在pH值为6.3和6.8的高过饱和度方面具有很强的一致性，但在pH 6.8的溶液为低过饱和度时则存在差异。观察到的差异归因于当钢被主动腐蚀时两种条件之间表面饱和率的显着差异。对预FeCO3薄膜化碳钢测定的CLARs表明，一旦薄膜在较低的体积过饱和度下建立了保护性屏障，FeCO3形成的动力学就会大大降低。结果突出了生长初期和保护膜显影后长期遇到的表层累积动力学之间的对比。

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