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Badania impedancyjne wpływu alkalicznego odczynu cieczy porowej betonu na cynkową powłokę ochronną stali zbrojeniowej

Jaśniok M., Kołodziej J.

Roczniki Inżynierii Budowlanej

2015

z. 15

37--42

The work concerns the durability testing of zinc coatings on smooth St3S grade reinforcing steel in solution modeling of concrete pore liquid having a pH of 13.4.The tests were carried out by impedance spectroscopy method on three metal samples. One sample was not protected with coating while the two other samples were hot dip galvanized and had coatings of 50 μm and 100 μm in thickness. Analysis of the results of the impedance measurements showed that the steel without coating is passivated in solution at pH of 13.4while the galvanized samples of steel intensely corrode. Calculated corrosion current density in the case of the galvanized steel samples were two orders of magnitude greater than the density of steel without protection. The results indicate the need for caution when using galvanized rebar in concrete structures and the need to design concrete mixes with the lowest pH.