Fe3C influence on the corrosion rate of mild steel in aqueousCO2 systems under turbulent flow conditions
Fe3C influence on the corrosion rate of mild steel in aqueousCO2 systems under turbulent flow conditions
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DOI：
10.1016/s0010-938x(01)00141-x
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发表时间：
2002-06-01
影响因子：
8.3
通讯作者：
Turgoose, S
中科院分区：
文献类型：
--
作者：
Mora-Mendoza, JL;Turgoose, S
研究了不同pH值和湍流条件下碳钢在CO2饱和溶液中的腐蚀和缓蚀行为。和直流技术在pH值为3.8的无抑制的解决方案表明，在短时间内形成的保护性表面膜（FeCO 3）。然而，随着暴露时间的增加，腐蚀速率总是增加，这是由于钢腐蚀产生的Fe3C残留物的表面积增加所致。在pH 5.5时，腐蚀速率总是随时间增加，行为也与Fe3C表面膜的存在有关。巨大的阴极面积的Fe3C似乎有一个更重要的电化学行为比不良形成的FeCO3产品的影响。Fe3C对季胺抑制剂在pH 3.8下的抑制作用是随着预腐蚀时间的增加而增加腐蚀速率。Fe 3 C导致（a）阴极面积增加，反映在腐蚀速率随时间增加，或（B）Fe 3 C层的孔中的电位梯度，其防止带正电荷的胺离子到达所有阳极位点。(C)2002爱思唯尔科技有限公司版权所有。
The corrosion and corrosion inhibition of mild Steel in CO2 saturated solutions were studied under turbulent flow conditions at different pH. Electrochemical measurements using a.c. and d.c. techniques in uninhibited solutions of pH 3.8 indicated the formation of protective surface films (FeCO3) in short immersion times. However, as the exposure time was increased the corrosion rate always increased, an effect attributed to the increased surface area of Fe3C residue from corrosion of the steel. At pH 5.5, the corrosion rate always increased with time, behaviour also associated with the presence of Fe3C surface film. The huge cathodic area of Fe3C seems to have a more important impact on the electrochemical behaviour than the poorly formed FeCO3 products. The effect of Fe3C on inhibition by a quaternary amine inhibitor at pH 3.8 is to increase the corrosion rate as the pre-corrosion time is increased. The Fe3C causes either (a) a cathodic area increase reflected in the corrosion rate increase with time or (b) a potential gradient in the pores of the Fe3C layer that prevents positively charge amine ions from reaching all anodic sites. (C) 2002 Elsevier Science Ltd. All rights reserved.