Abstract At the iron bentonite interface Fe-silicates were observed as corrosion products which are supposed to mainly result from destabilization of smectite possibly caused by increasing pH. The present paper aims to study the evolution of the pH at the iron-bentonite interface and attempts to explain reasons for the different results published so far. The pH of the pure iron-water mixtures varied from 10.8–11.0. The pH values of the iron-bentonite mixtures were lower suggesting that the clay buffered part of the alkalinity induced by the iron oxidation. Further research has to be conducted to investigate if this will lead to substantial smectite destabilization.

中文翻译：

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铁-膨润土界面附近pH值的演变

摘要 在铁膨润土界面观察到铁硅酸盐腐蚀产物，推测其主要是由于pH值升高引起蒙脱石不稳定。本论文旨在研究铁-膨润土界面 pH 值的演变，并试图解释迄今为止发表的不同结果的原因。纯铁水混合物的 pH 值在 10.8-11.0 之间变化。铁-膨润土混合物的 pH 值较低，表明粘土缓冲了部分由铁氧化引起的碱度。必须进行进一步的研究来调查这是否会导致蒙脱石的严重不稳定。