In the simulating high temperature and high pressure oilfield environment containing CO2, the structure characteristics and ion passing selectivity of corrosion scale were experimentally researched for conventional N80 steel and 4% Cr containing N80 steel. The results shown that the iron carbonate scale formed on conventional N80 steel has cation passing selectivity, so that the protection properties of the scale is relatively poor for metallic matrix material, and the scale relatively easily enhance the formation of pitting. The amorphous compound Cr(OH)3 scale formed on 4% Cr containing N80 steel has anion passing selectivity, it is able to remarkably reduce corrosion rate and prevent the formation of pitting.

Subject
Anions, Test methods, Steel surfaces, Ions, Metal surfaces, Corrosion scales, Interfaces, Metals, Scale formation, Surface layers, Steel, Pitting, Cations
Keywords:
CO2 corrosion. Corrosion scales, N80 steel, Cr-containing N80 steel, ion passing selectivity
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2003
Association for Materials Protection and Performance (AMPP)
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