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Effect of alloying elements (Cr, Mn) on Corrosion Properties of high strength steel in 3.5% NaCl solution

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Document pages: 13 pages

Abstract: The effects of chromium and manganese as alloy elements on the corrosion resistance of carbon steel and the electron energy loss spectrum were evaluated by weight loss test, polarization test, X-ray diffraction, rust analysis, Raman spectrum, transmission electron microscope and energy dispersion spectrum. The weight loss behavior conforms to the typical parabolic law. The oxidation state of iron in rust is higher along the fast path, but it is not proportional to the distance from the alloy AR interface. This shows that the corrosion process of the alloy is controlled by the transport of oxygen to the rust layer. The improvement of corrosion resistance of 18mN and 18Mn5Cr is due to the refinement of the two materialsrain in adherent rust (AR) and the increase of the amounts of goethite in nonadherent rust (NAR) by chromium and manganese. Especially, the effectiveness of chromium on corrosion resistance was also related to the refinements of grain in AR and the amounts of goethite in NAR. The Tafel extrapolation method was inadequate to measure the instantaneous corrosion rate of steels with various alloying elements and immersion periods because of the difference in electrochemical reduction rates of rust, depending on its constituent.

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