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CREVICE CORROSION BEHAVIOR OF X70 steel IN HCO_3^- SOLUTION UNDER CATHODIC POLARIZATION

Acta Metallurgica Sinica(English Letters) 2008年第4期21卷 235-244页

作者： C.W. Du X.G. Li X. Chen P. Liang H. Guo School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Liaoning University of Petroleum and Chemical Technology ~shun 113001 China

The crevice corrosion behavior of xto steel was investigated with a wedge-shaped crevice assembly under -1000 m V （SCE） cathodic polarization in the solutions with various HCO3 concentrations. The potential, current, pH and the oxygen content within the crevice were measured with or without outside coupled specimen. The results indicated that the polarization potential of xto steel in the crevice dropped with the increase of time under the cathodic polarization. There was a remarkable influence of HCO3 concentration on the potential of xto steel in the crevice. When HCO3 concentration was up to 0.125%, the surface of the metal was covered with the corrosion products that resulted in the polarization extent of xto steel decreased. The pH value in the crevice rose and it dropped gradually from the crevice mouth to the bottom under the cathodic polarization. With the increasing of HCO3 concentration, the hydrolyzation reaction of metal in the crevice bottom aggravated. Most of the dissolved oxygen in the crevice was consumed by the cathodic current. The maximum cathodic current on the metal surface was at the crevice mouth and it was much more than that at the crevice bottom.

关键词： Cathodic polarization xto steel Potential pH value Oxygen

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CORROSION INHIBITION OF X70 steel IN SALINE SOLUTION SATURATED WITH CO_2 BY THIOUREA

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 65-71页

作者： X. Y. He H. Y. Deng R. Li X.D. Fei H.Y.Wang Z. Y. Deng College of Chemistry and Chemical Engineering China West Normal University Nanchong 637002 China

Corrosion monitoring techniques were performed on X7O steel in saline solution saturated with CO2 with and without thiourea additives within the concentration range 5-25 mg/L. It was found that when the concentration of the inhibitors were increased, the inhibitor efficiencies（IE） of thiourea varied with solution temperature and immersion time. The results indicated that thiourea had the highest inhibition efficiency. The potentiondynamic polarization studies revealed that thiourea are mixed-type inhibitor that mainly restrains the anodic process.

关键词： Corrosion Inhibition Thiourea xto steel

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