A Method for Evaluating the Potential Range of Cathodic Protection in Soil Environment

Abstract

The invention belongs to the technical field of metal material cathodic protection, and particularly provides A Method for Evaluating the Potential Range of Cathodic Protection in Soil Environment , can quickly determine the effective protection potential range of localized corrosion of materials in soil to solve using the international standard NACE? RP? The cathodic protection potential range determined by the cathodic protection range judgment criterion in 0169 cannot effectively prevent localized corrosion. Use the slow-rate scanning polarization curve and the fast-rate scanning polarization curve to obtain the quasi-equilibrium state and the zero-current potential under the condition of being disturbed by the fast-scanning state, and select both the fast-scanning and slow-scanning polarization curves to be in the cathodic polarization range without exceeding The potential range of the overprotection potential is used as the cathodic protection potential in the actual construction process to prevent localized corrosion such as pitting corrosion, stress corrosion, and crevice corrosion in buried pipelines under cathodic protection.

Description

technical field [0001] The invention belongs to the technical field of cathodic protection of metal materials, and in particular provides a method for evaluating the potential range of cathodic protection in soil environment. Background technique [0002] Cathodic protection technology is one of the most important technologies in the field of corrosion protection. Especially for pressure-bearing facilities such as buried pipelines, the soil conditions in the area where they pass or are located are complex and changeable, and there may be interference from certain AC stray currents (usually considered to be weakly corrosive and not targeted for protection). Often lead to conventional cathodic protection conditions can not effectively slow down the soil environment corrosion damage of buried steel pipelines or pressure equipment, resulting in huge economic losses and even casualties, so it is necessary to use cathodic protection technology for corrosion protection. According ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a rapid evaluation method for the effectiveness of the cathodic protection potential range of the soil environment, which can solve the problem that the local corrosion of materials in the soil cannot be effectively prevented by using the cathodic protection range of the international standard

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