DEVICE AND METHOD FOR MEASURING CRITICAL CHLORIDE ION CONCENTRATION FOR DEPASSIVATION OF STEEL BARS IN CEMENT-BASED MATERIALS

摘要

A device and a method for measuring the critical chloride ion concentration for depassivation of steel bars in cement-based materials. Said device comprises: a piece to be tested (1), a chlorine ion electromigration device, and an electrochemical test device. Said method comprises: a chlorine ion electromigration cycle test, measurement of a corrosion current density characteristic parameter, and a quantitative determination criterion for depassivation of a test surface of a steel bar electrode (2). The chlorine ion electromigration device is used to carry out a chlorine ion electromigration cycle test; the electrochemical test device is used to measure and calculate corrosion current density characteristic parameters; and whether depassivation occurs to a test surface of a steel bar electrode (2) in a cement-based material is determined according to the quantitative determination criterion for depassivation of the test surface of the steel bar electrode (2). The method can not only accelerate the transmission of chloride ions in a cement-based material, significantly shortening a test period, but can also simultaneously quantitatively determine whether depassivation occurs to test surfaces of a plurality of steel bar electrodes (2) in a piece to be tested (1), thereby quickly and accurately measuring the critical chloride ion concentration for depassivation of steel bars in the cement-based material.