Galvanic corrosion behavior of deposit-covered and uncovered carbon steel

Galvanic corrosion behavior of deposit-covered and uncovered carbon steel
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沉积物覆盖和未覆盖碳钢的电偶腐蚀行为

DOI:
10.1016/j.corsci.2014.05.011
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发表时间:
2014-09
期刊:
影响因子:
8.3
通讯作者:
X.P. Guo
X.P. Guo
中科院分区:
材料科学1区
文献类型:
--
作者:
G.A. Zhang;N.Yu;L.Y. Yang;X.P. Guo

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通过电化学测试和表面表征,研究了混合沉积物覆盖电极与裸电极在含CO2地层水中的电偶效应。发现在25 °C时,裸电极始终充当阳极,而沉积物覆盖电极始终充当阴极。由于在裸电极上形成FeCO3,在60 °C的后期极性反转。用丝束电极测定了存款下局部腐蚀的发生和扩展。WBE的电流和电位图显示,严重的局部腐蚀发生在沉积物覆盖的电极。
The galvanic effect between the mixed deposit-covered electrode and bare electrode in CO2-containing formation water was studied by electrochemical measurements and surface characterization. It is found that the bare electrode always acts as anode while the deposit-covered electrode always acts as cathode at 25 °C. The polarity reverses at the late stage at 60 °C due to the formation of FeCO3on the bare electrode. Wire beam electrode was used to determine the initiation and propagation of localized corrosion under deposit. Current and potential maps of WBE reveal that severe localized corrosion occurs at the deposit-covered electrodes.
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