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Influence of the Soil Moisture Level and Differential Aeration Cell on the Corrosion Rate of Carbon Steel and Zinc Coated Steel

Picture for Influence of the Soil Moisture Level and Differential Aeration Cell on the Corrosion Rate of Carbon Steel and Zinc Coated Steel
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Soil is a complex media involving solid particles, gas and liquid phases. Among the many soil parameters influencing the corrosion rate, beyond the pH and resistivity, disregards the microbial activity, the moisture level and the related oxygen diffusion is usually pointed out as a key parameter. Depending on the soil texture and related ability to retain water, as well as the ground water level, differential aeration corrosion cells (DACC) might appear. Such phenomenon locally affects the corrosion rate and distribution by galvanic action. This phenomenon is particularly relevant for large metallic pieces such as buried pipes, tubular piles, and sheet piles. In this study, an experimental setup composed of 30 coupons in carbon steel or zinc coated steel was exposed in two different soils to a vertical gradient of moisture level. The setup allows measuring the corrosion potential and galvanic current of each coupon, before and after their interconnection. The obtained results highlight i) the influence of the moisture level and oxygen diffusion on the corrosion potential for both carbon steel and zinc, and ii) quantify the differential aeration corrosion cells. The results are compared to coupons exposed for 1 year in the same environment, with and without DACC.
Product Number: 51324-20694-SG
Author: Erwan Diler; Philippe Verpoort; Souhail Amami; Ansbert De Cleene; Benoit Emo
Publication Date: 2024
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Author: Thomas J. Langill
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