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Abstract The corrosion behavior of mild steel in soil with various moisture and microbial condition has been investigated. The results showed that with increase in soil moisture from 6.5 to 25%, the weight loss of the steel due to corrosion as well as the soil resistivity, redox potential and count of aerobic bacteria decreased, while the count of sulfate-reducing bacteria markedly increased. When the moisture was near the saturation point, there was little change of corrosion rate, and the "critical soil moisture" for corrosion was at 18～20%. The maximum pit depths occured between 12% and 15% moisture, and the minimum at over 20%. At moisture content of 6.5～20%, corrosion was mostly localized, but over 20% general corrosion predominated, The weight loss of steel in soil with intensive activity of microbes was 40～123% higher than that in microbes inhibited soil at low moisture levels. The causes for steel corrosion under various soil moisture have been discussed.
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Received: 25 April 1984
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