Abstract
The corrosion behavior of Q235 carbon steel for grounding grids in artificial soils was studied by EIS, polarization curve measurement, SEM, EDS and XRD. These artificial soils were admixture of typical soil from the Shanghai free trade zone with different amount of salt, aiming to simulate the corrosivity of various soils of the entire Shanghai area. It is shown that with the increasing time, the corrosion impedance of the buried Q235 carbon steel increases firstly and then tends to be stable in soils with different salinity, its corrosion rates increases with the increasing salt content. The Q235 carbon steel suffered mainly from uniform corrosion accompanied with microbial corrosion, its corrosion products consisted mainly of Fe2O3. According to the evaluation criteria for corrosion resistance, the corrosion resistance of Q235 carbon steel for grounding grids in Shanghai soils can be ranked as fine.
Published Version
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