Abstract
The corrosion behavior of 1020C carbon steel samples that had been subjected to oxidizing heat treatment at 550°C and 675°C were studied in sodium chloride electrolytes using a 3-electrode electrochemical impedance spectroscopy. Experimental data were used to evaluate the corrosion behavior of the samples while optical microscopy was employed to investigate the surface characteristics of the samples before and after aqueous corrosion. The results showed that while the sample treated at 550°C revealed an increasing corrosion rate with time, the sample treated at 675°C indicated a higher initial corrosion rate, but the rate declined gradually over the 4-day experimental period. Optical microscopy revealed significant formation of surface corrosion products on both heat treated samples, but the complex plane diagrams indicated significant capacitive behavior for the heat treated samples relative to the untreated samples.
Highlights
The corrosion behavior of carbon and stainless steels in service under high temperature conditions has become a subject of major research interest for a number of industrial applications [1,2]
The results showed that while the sample treated at 550 ̊C revealed an increasing corrosion rate with time, the sample treated at 675 ̊C indicated a higher initial corrosion rate, but the rate declined gradually over the 4-day experimental period
The results presented here show that the aqueous corrosion trends with time for the same low-carbon steel samples are different for oxidative treatments at 550 ̊C and 675 ̊C
Summary
The corrosion behavior of carbon and stainless steels in service under high temperature conditions has become a subject of major research interest for a number of industrial applications [1,2]. The mechanical inclusion of Y-Ti-O nano-particles into Fe-Cr based ferritic alloy was reported by Alinger et al [6] to impart remarkably high temperature stability with limited nanocluster growth and coarsening These materials, generally referred to as oxide dispersion strengthened (ODS) steels, are believed to have excellent potential for corrosion and degradation resistance at high temperatures due to their unique nanostructures. While the development of new materials that are corrosion resistant at high temperatures is critical, one of the major scientific challenges that have not been fully addressed is the fundamental understanding of the electrochemical mechanisms for corrosive environmental degradation that limit the effective use of structural steel materials in extreme temperature environments Meeting this challenge will require a basic and systematic study of the effects of high temperature treatment on the corrosion behavior of a variety of structural steel materials, including carbon steel, stainless steel, and various specialty steels that are candidate materials for high temperature service. The study was based on the simple hypothesis that higher oxidative heat treatment temperatures should result in higher aqueous corrosion rates for low carbon steel
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