Abstract
Coupons of the grounding material Q235 steel were buried in an artificial soil of diato- mite with different pH values for 20 d, and then the corrosion behavior of the steel was examined. The results indicated that the pH value of the artificial soil had a great effect on the corrosion be- havior of Q235 steel. With the increasing of pH value, the corrosion rate of the steel in the artificial soil decreased, which accorded fairly well with that in the actual soil, correspondingly the corro- sion type of the coupons turned from rather serious uniform corrosion to slight local corrosion. The corrosion products formed in acidic artificial soil are consistent with those in an alkaline artificial soil, they all composed mainly of α-FeOOH, Fe3O4, γ-FeOOH and Fe2O3, however the products in the late case contained higher Fe3O4 and less α-FeOOH.
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