DEGRADATION IN A CORROSIVE ENVIRONMENT OF STEELS USED IN THE CONSTRUCTION OF METAL STRUCTURES

Florin CIOFU

Abstract


This paper explores how atmospheric conditions affect the corrosion behavior of low-alloy steels S235JR and S355JR, commonly employed in industrial metal structures like harbor cranes and mining machinery. The investigation examines the impact of environmental parameters—including salinity, sulfur dioxide concentration, relative humidity, and temperature—on both the corrosion rate and the mechanical integrity of these materials. The experimental setup simulated polluted industrial atmospheres under controlled conditions. Corrosion was evaluated using gravimetric analysis, optical microscopy for microstructural characterization, and examination of corrosion products. Results revealed that certain iron oxyhydroxide phases, such as β-FeOOH, formed more readily in saline environments and contributed to surface degradation by promoting structural flaws like pores and cracks. These findings offer useful insights for optimizing anti-corrosion strategies, including protective coatings and inhibitor use, to enhance the durability of steel structures exposed to harsh atmospheric environments.

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References


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