Abstract
In the present paper, the change in localized corrosion behavior of epoxy resin-coated low-alloy steel with varying Cr content of the steel was studied in 3% NaCl solution using localized electrochemical impedance spectroscopy (LEIS). The LEIS was operated in both frequency sweep and mapping in a single frequency mode. The characteristics of the surfaces after LEIS were observed at SEM and EDX analyses. The LEIS mapping results exhibited lower impedance values on the scratched area than that of the coated area, which signifies the higher protection of the coated surface provided by the epoxy coating. Moreover, the steel with higher Cr content has possessed excellent corrosion resistance (observed from LEIS results) due to the formation of highly stable, protective Fe- and Cr-containing duplex hydroxide (Cr2Fe(OH)2) (rust) layer on its surface. The corrosion behavior of the low-alloy steel was improved by the addition of Cr. Further, epoxy coating have provided significant support to the steel substrate against corrosion.
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