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A comparison between the effects of different deicers on external corrosion of buried pipes
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1  Department of Civil & Environmental Engineering, P. O. Box 642910, Washington State University, Pullman, WA 99164-2910


The constant penetration of road deicers into the soil threatens the durability and reliability of buried pipes, most of which are made of ferrous alloys. In this work, the corrosion behavior of C1008 carbon steel, 65-45-12 ductile iron and CL35 gray cast iron in the simulated soil solution in the presence and absence of beet juice, as a common bio-additive to road deicers, was studied. To simulate the near-road pipeline scenario, two types of road deicers including 23% NaCl and 30% MgCl2 with different dilution ratios (1:90 and 1:30) were added to the test solution. Beet juice was analyzed by Fourier transform infrared spectroscopy (FT-IR) and liquid chromatography-mass spectrometry (LC-MS). The corrosion behavior of the test coupons was studied using linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). The corrosion product layer was also evaluated by energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM). Laboratory data showed new insights into the mechanism of pipe protection by beet juice and the effect of road deicer composition, dilution ratio and alloy type on external corrosion of buried pipes.

Keywords: Road Deicer; Bio-based Additive; External Corrosion; Buried Pipes