Evolution of the pH value at the vicinity of the iron-bentonite interface

被引：5
作者：
Kaufhold, Stephan [1 ]
Dohrmann, Reiner [1 ]
Weber, Christian [1 ]
机构：
[1] Bundesanstalt Geowissensch & Rohstoffe, BGR, Stilleweg 2, D-30655 Hannover, Germany
来源：
APPLIED CLAY SCIENCE | 2021年 / 201卷
关键词：
Iron; Corrosion; Bentonite; Clay stone; Shale; pH value; 90; DEGREES-C; SMECTITE INTERACTION; CORROSION PRODUCTS; CLAY INTERACTIONS; METALLIC IRON; CARBON-STEEL; STABILITY; SURFACE; TEMPERATURE; REDUCTION;
D O I：
10.1016/j.clay.2020.105929
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
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页数：7
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