Abstract
The atmospheric corrosion of weathering steels varies as a function of geographic zone, season, and other environmental variables related to that region which the experiments have been done. Meanwhile, rusting is a continuous process, and it is the main corrosion product of atmospheric corrosion. The current study investigates the effects of rust on weathering steel in the localized region of Digha, a sea resort of West Bengal, India. The investigations have been performed by purposely accelerating the rusting of weathering steel in a laboratory within one week in order to simulate approximately 18 months of actual rusting that can be achieved at field exposure. Anodic polarization of weathering steel comparable to potentiostatic passivation is obtained by shorting weathering steel with nobler metals, such as copper or graphite. The effect of rust formation on corrosion resistance after being immersed in 0.01 M KCl solutions for polished and unpolished samples has been investigated using electrochemical techniques, such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The rusted surfaces’ morphology and composition were characterized using field emission scanning electron microscope (FE-SEM) and energy dispersive X-ray analysis (EDX). Based on the obtained results, it is concluded that the progressive rusting of weathering steel leads to a decrease in corrosion rate.
Highlights
Corrosion of substances and materials that are exposed to open air and its pollutants, as opposed to submerged in fluid, is called atmospheric or air corrosion [1]
The corrosion rate of weathering steel that was anodically polarized with Cu or graphite showed a significant decrease in corrosion rate, confirming that the progressive rusting of weathering steel leads to a progressive decrease in the corrosion rate
Weathering steel was connected with nobler metals in order to simulate the production of rust that can occur during long periods of exposure in Digha, a sea resort of West Bengal, India
Summary
Corrosion of substances and materials that are exposed to open air and its pollutants, as opposed to submerged in fluid, is called atmospheric or air corrosion [1]. The everincreasing dissatisfaction with atmospheric corrosion is leading in expense and weight loss of material above any other type of material degradation processes. Atmospheric corrosion is accountable for half the corrosion damage every year [2]. Some metals that form non-permeable layers give rise to the formation of oxides, which, in turn, achieve limited thickness through the dispersion of hardly noticeable oxide layers at room temperatures, unseen by the naked eye. In the case of metals such as chromium, titanium, and weathering steel, these limited thickness layers give an incredible shield over the metal surface. Different levels of pollutants entering the environment affect the corrosion rate
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