In situ synchrotron X-ray diffraction study of scale formation during CO2 corrosion of carbon steel in sodium and magnesium chloride solutions

被引：73
|
作者：
Ingham, B. [2 ,3 ]
Ko, M. [1 ,3 ,4 ]
Laycock, N. [1 ]
Burnell, J. [2 ]
Kappen, P. [5 ]
Kimpton, J. A. [6 ]
Williams, D. E. [3 ,4 ]
机构：
[1] Quest Integr Grp, Lower Hutt 5045, New Zealand
[2] Ind Res Ltd, Lower Hutt 5045, New Zealand
[3] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Wellington 6140, New Zealand
[4] Univ Auckland, Sch Chem Sci, Auckland 1022, New Zealand
[5] La Trobe Univ, Dept Phys, Ctr Mat & Surface Sci, Bundoora, Vic 3086, Australia
[6] Australian Synchrotron, Clayton, Vic 3168, Australia
来源：
CORROSION SCIENCE | 2012年 / 56卷
关键词：
SEM; X-ray diffraction; Mild steel; DIOXIDE CORROSION; MILD-STEEL; MECHANISTIC MODEL; RESISTANCE; PRODUCT; FILMS;
D O I：
10.1016/j.corsci.2011.11.017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In situ synchrotron X-ray diffraction was used to follow the formation of corrosion products on carbon steel in CO2 saturated NaCl solution and mixed NaCl/magnesium chloride (MgCl2) at 80 degrees C. Siderite (FeCO3) was the only phase formed in NaCl solution, while Fe(OH)(2)CO3 was also detected when MgCl2 was present. The proposed model is that siderite precipitation, occurring once the critical supersaturation was exceeded within a defined boundary layer, caused local acidification which accelerated the anodic dissolution of iron. The current fell once a complete surface scale was formed. It is suggested that MgCl2 addition decreased the required critical supersaturation for precipitation. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：96 / 104
页数：9
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