Corrosion characteristics of low-carbon steel anchor bolts in a carbonaceous mudstone environment

Abstract

The overall safety of anchorage engineering is jeopardized by the corrosion failure of low-carbon steel anchor bolts in a complicated geotechnical environment. To research the corrosion behaviour of low-carbon steel anchor bolts in carbonaceous mudstone slopes and to reveal the corrosion characteristics and mechanism of low-carbon steel anchor bolts under different corrosion time, solution corrosion, electrochemical corrosion and microscopic tests of low-carbon steel anchor bolts were carried out using a carbonaceous mudstone soaking solution and low-carbon steel anchor bolts as corrosion specimens. The results show that the low-carbon steel anchor bolts undergo obvious electrochemical corrosion in the carbonaceous mudstone environment. The corrosion product colour gradually deepened and the corrosion area gradually increased with increasing corrosion time. In the early stage of corrosion (0–10 d), the corrosion rate per unit area rapidly increased, and a thin oxide layer formed on the surface of the low-carbon steel anchor bolts. However, with the oxidation of Fe ions on the surface of the low-carbon steel anchor bolt body, the oxide film was gradually destroyed, resulting in the accumulation of corrosion products on the entire low-carbon steel anchor bolt surface. At this time, the entire reaction process was dominated by charge transfer and substance transfer.

Keywords

carbonaceous mudstone / low-carbon steel anchor bolt / corrosion characteristics / electrochemical test / corrosion rate

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