A method for measuring the hydrogen evolution critical current density of steel bars in reinforced concrete structures

Abstract

The invention discloses a method of measuring a critical current density in hydrogen evolution through a reinforced steel bar in a reinforced concrete structure. The method comprises the steps of connecting the reinforced steel bar put in a concrete sample, a counter electrode and a reference electrode to an electrochemical workstation respectively in a corresponding mode so as to form a three-electrode testing system; starting the electrochemical workstation, conducting a cathodic polarization test on the reinforced steel bar, firstly testing a natural potential of the reinforced steel bar, then using the natural potential as a starting point, and scanning a changing value of an electric potential of the reinforced steel bar in a cathodic polarization area; finishing the polarization of the reinforced steel bar when the electric potential of reinforced steel bar in the cathodic polarization area is in an interval value n so as to obtain a cathodic polarization curve; calculating a first derivative or a second derivative of the cathodic polarization curve, finding a mutational site, determining the mutational site as an original state occurred during the hydrogen evolution reaction through the reinforced steel bar, and measuring an electric potential value and an electric current density value of the mutational site. The measuring method can quickly and accurately measure the critical current density in hydrogen evolution through the reinforced steel bar, does not destroy the concrete structure, and is applicable to engineering application.

Description

technical field [0001] The invention relates to the technical field of electrochemical treatment, in particular to a method for measuring the hydrogen evolution critical current density of steel bars in reinforced concrete structures. Background technique [0002] Coastal areas are concentrated areas of large-scale economic construction in China. However, due to the influence of corrosive environments such as seawater and marine climate, reinforced concrete structures in coastal areas are more susceptible to corrosion by chloride ions, resulting in corrosion of steel bars, resulting in major economic losses. At present, many researches and engineering practices at home and abroad have confirmed that electrochemical repair based on electrochemical principles for existing reinforced concrete structures can effectively remove chloride ions and prolong the service life of structures. However, electrochemical repair technology is a complex electrochemical process. While eliminati...

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Problems solved by technology

[0011] The invention provides a method for measuring the critical current density of hydrogen evolution of steel bars in reinforced concrete structures, which solves the technical defect that the prior art cannot accurately measure the critical current density of hydrogen evolution of steel bars in reinforced concrete structures, and provides a method for controlling and avoiding the hydrogen evolution critical current density of steel bars in electrochemical repairs. The problem of hydrogen embrittlement provides a firm technical guarantee

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