engleski

Corrosion resistance of Cor-Ten steel in different environments

Construction materials exposed to atmospheric conditions are often subject to corrosion and need to be protected or prevented from further corrosion [1]. The aim of this paper was to determine the behavior of the weathering steel Cor-Ten in different media: distilled water, acid rain and seawater during the three months. Cor- Ten steel got its name because of its corrosion resistance and tensile strength properties. It is available as Cor-Ten A and Cor-Ten B [2]. Corrosion morphologies were observed by stereomicroscope while the changes of samples and shape of corrosion products and their adhesion to the material were monitored by the visual method. Also, mass loss of samples was measured and corrosion resistance of the Cor-Ten was estimated by electrochemical impedance spectroscopy (EIS). These results show that the microstructure of Cor-Ten steel is fine-grained and slightly directed ; it is composed of ferrite and perlite. The surface of exposed samples to distilled water was the least corroded, while the effect of corrosion was most pronounced in samples exposed to seawater. All tested samples had obvious nonuniform corrosion and the formation of solids products in the form of flakes. There was no change in the mass of the samples in distilled water and acid rain, while in the samples in seawater there was a very small loss of mass. The obtained EIS results showed that the surface of Cor-ten steel starts to be reactive with exposure to aquatic mediums, which is different from the scientific literature for this material [3]. Cor- ten steel passivates itself by creating an oxide layer on its surface, and for this reason, no additional protection of its surface is required.

weathering steel

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