Abstract
The corrosion behavior of X80 steel in a near-neutral soil-simulated solution under various DC stray currents and applied strains was investigated using electrochemical measurements (open circuit potential, linear polarization, and electrochemical impedance spectroscopy) and surface analysis techniques. Our results show that a DC stray current has a substantially greater effect on steel corrosion compared to applied strain. However, strain could slow down the corrosion rate in specific conditions by affecting the composition of corrosion products and the structure of the corrosion scale on the surface of the steel. Although the porosity of the corrosion scale of steel without an applied strain will increase with increasing DC currents, once strain is applied, the corrosion scale will become denser. Furthermore, both DC currents and strain can promote steel pitting, and the number and size of pitting holes will increase significantly with an increase in current densities.
Highlights
When the steel is within the range of elastic deformation, the electrode simulation solution was investigated by electrochemical measurements and surface analpotential ∆φ is calculated by: ysis techniques
Simulation solution, but the influence of DC currents is much more significant than where ∆P represents the load applied to the electrode, Vi represents the molar volume of strain
The γ − FeOOH generated under applied DC currents can increase the porosity of the product layer and can promote corrosion
Summary
As demand grows for energy resources such as oil and gas, the number of long-distance buried pipelines has increased. Such complex electrified lines and pipelines will inevitably form a so-called public corridor during their design and construction, which can increase the risk of pipeline corrosion by stray currents [1,2,3]. The coupling of stray currents and strain applied on buried pipelines is becoming a pressing issue. The DC-induced corrosion of buried pipelines is widely recognized, the mechanism of pipeline degradation underlying DC stray currents and strain remains controversial
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