Anaerobic corrosion of carbon steel in bentonite: An evolving interface

被引：25
作者：
Leupin, Olivier X. [1 ]
Smart, Nick R. [2 ]
Zhang, Zhidong [3 ]
Stefanoni, Matteo [3 ]
Angst, Ueli [3 ]
Papafotiou, Alexandros [4 ]
Diomidis, Nikitas [1 ]
机构：
[1] Nagra, Natl Cooperat Disposal Radioact Waste, Hardstr 73,Postfach 280, CH-5430 Wettingen, Switzerland
[2] Jacobs, HQ Bldg,Thomson Ave,Harwell Campus, Didcot OX11 0GD, Oxon, England
[3] Swiss Fed Inst Technol, Inst Bldg Mat IfB, Durabil Engn Mat, Stefano Franscini Pl 3, CH-8093 Zurich, Switzerland
[4] Intera Inc, Swiss Branch, Hardstr 73, CH-5430 Wettingen, Switzerland
来源：
CORROSION SCIENCE | 2021年 / 187卷
关键词：
C; Anaerobic corrosion; A; Carbon steel; Oxygen sorption; Bentonite; Hydrogen transport; B; Modelling studies; IN-SITU TEST; COMPACTED BENTONITE; ARTIFICIAL GROUNDWATERS; CORRODING IRON; CAST-IRON; TRANSPORT; DIFFUSION; PRODUCTS; PERFORMANCE; ADSORPTION;
D O I：
10.1016/j.corsci.2021.109523
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Experimental evidence related to the interactions between steel corrosion and bentonite in deep geological repositories is reconsidered. The released Fe2+ interacts with the smectite and precipitates as Fe3+ when oxidised by residual immobile oxygen. This leads to the development of coloured fronts in the bentonite. The evolution of these fronts can be reproduced by a reactive transport model that takes account of the competition between diffusion and precipitation. Furthermore, two-phase flow modelling indicates that the consumption of water by the corrosion outpaces the diffusion of water through the bentonite, leading to shrinkage microfractures in bentonite that act as preferential pathways for corrosion products.
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收藏
页数：17
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