Method for measuring PH critical value of reinforcing steel corrosion

Abstract

A reinforcement bar corrosion pH critical value determining method relates to a determination of a pH critical value. The invention provides a reinforcement bar corrosion pH critical value determining method which dips the reinforcement bar in absolute ethyl alcohol for being washed by ultrasonic and wiped up after burnishing and cleaning the electrode surface of the reinforcement bar; arranges the electrode of the reinforcement bar into an electrolytic cell and mounts a scanning microelectrode as well as a micro-reference electrode for forming an electrolytic cell used for determining the potential distribution on the surface of the reinforcement bar and confirming the reinforcement bar corrosion pH critical value; arranges the electrolytic cell in a scanning microelectrode measuring system; mounts simulated concrete hole liquid in the electrolytic cell, calculates the time of the electrode of reinforcement bar to be dipped in the simulated concrete hole liquid and uses water for regulating the pH value of the simulated concrete hole liquid to be 10.00 to 12.50 and reviews reinforcement bar corrosion behavior by respectively determining the potential distribution at the micro-areas on the surface in the simulated concrete hole liquid of the electrode of the reinforcement bar with various pH values and confirms the pH critical value causing the reinforcement bar corrosion by adopting a successive approximation method.

Description

technical field [0001] The invention relates to a measurement of a pH critical value, in particular to a method for measuring a pH critical value of steel bar corrosion. Background technique [0002] As a main building material, reinforced concrete is widely used in various projects and plays a great role in national economic construction. However, premature failure of reinforced concrete structures due to carbonization (neutralization) of concrete and chloride corrosion is a disaster that is widely concerned and increasingly prominent in the world today, and it has caused huge losses beyond people's expectations. Corrosion damage of steel bars is the primary factor leading to premature failure of reinforced concrete structures. Therefore, the detection of corrosion behavior of steel bars is an urgent task and has very important significance (1, Kumar VINOD. Protection of steel reinforcement for concrete-Areview [J]. Corrosion Reviews, 1988, 16 (4): 317-358 ;2. Fan Yunchan...

AI Technical Summary

Problems solved by technology

The commonly used pH meter can be used to directly measure the pH value of the solution, but it cannot observe the corrosion behavior of the steel bar at the same time, and the commonly used pH meter measures the pH value of the solution body, which cannot reflect the change information of the local corrosion on the steel bar surface in time

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