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10030 Effect of the Cathodic Protection on API X-52 and API X-65 Steels with Different Types of Soils

Picture for 10030 Effect of the Cathodic Protection on API X-52 and API X-65 Steels with Different Types of Soil
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Product Number: 51300-10030-SG
ISBN: 10030 2010 CP
Author: M Tirzo, L Cantero, E Rosas, V Lugo, A Aguilar, D Mendoza, R Esparza, and R Perez
Publication Date: 2010
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The cost by power quantity necessary for cathodic protection on buried steel pipelines has been increased quickly with the years. Cathodic protection has been applied for many years as one the best method to prevent the corrosion in systems which transported hydrocarbon. It is widely accepted that the necessary potential to prevent the corrosion is probably close to -850 mV, this with respect to a saturated copper/copper sulfate reference electrode. However, in some situations, such as the sulfurous presence, bacteria, high temperatures, sour atmospheres, and dissimilar metals, the criterion of -850 mV is not sufficient. In this investigation, studies of the corrosion on steels with different protection potentials (-850, -650 and -1100 mV) have been carried out. The used electrolytes were simulated soils (carbonatebicarbonate solution) and natural soils. Electrochemical techniques of weight lost and polarization resistance were carrying out. The obtained results showed that the optimum potential is -850 mV for both steels. The polarization curves showed low corrosion rates when the potential to -850 mV was used. Thereby, the used potentials to -650 and -1100 mV increased the corrosion rates.

Keywords: Cathodic protection, Steels, Soil environment, Polarization curves, Corrosion behavior.
The cost by power quantity necessary for cathodic protection on buried steel pipelines has been increased quickly with the years. Cathodic protection has been applied for many years as one the best method to prevent the corrosion in systems which transported hydrocarbon. It is widely accepted that the necessary potential to prevent the corrosion is probably close to -850 mV, this with respect to a saturated copper/copper sulfate reference electrode. However, in some situations, such as the sulfurous presence, bacteria, high temperatures, sour atmospheres, and dissimilar metals, the criterion of -850 mV is not sufficient. In this investigation, studies of the corrosion on steels with different protection potentials (-850, -650 and -1100 mV) have been carried out. The used electrolytes were simulated soils (carbonatebicarbonate solution) and natural soils. Electrochemical techniques of weight lost and polarization resistance were carrying out. The obtained results showed that the optimum potential is -850 mV for both steels. The polarization curves showed low corrosion rates when the potential to -850 mV was used. Thereby, the used potentials to -650 and -1100 mV increased the corrosion rates.

Keywords: Cathodic protection, Steels, Soil environment, Polarization curves, Corrosion behavior.
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