Abstract
Abstract This paper discusses the effects of soils polluted with different magnesium chloride (MgCl2) contents on the corrosion of Q235 low-carbon steel pipelines. The material has a yield strength of 235 MPa. The following major parameters were considered in the experimental study to analyze MgCl2 polluted soils: degree of saturation Sr, electrical resistivity ρs, oxidation reduction potential Eh7 and corrosion potential Ecorr. The corrosion properties of Q235 steel samples buried in soils, such as corrosion behavior of macrographs and scanning electronic microscopy (SEM) photos, chemical elements components of corrosive products by energy dispersive spectrometer (EDS), corrosion weight loss mcor, corrosion rate vcor, and dynamic equation of mcor, were studied in detail. Based on the statistical analysis results obtained from this study, MgCl2 has a significant impact on ρs, while MgCl2 has lesser effects on other parameters. Corrosion macro and micro behaviors of Q235 steel were revealed. The vcor of Q235 steel decreases with the increase of corrosion time (t), while it increases with MgCl2 contents. The dynamic equation for mcor and the pollution impact factor β for Q235 steel in MgCl2 polluted soils are proposed. Lastly, a developed multi-linear regression equation for vcor is recommended.
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