Steel S235JR is one of the most popular structural material using on welding constructions. The microstructure of this steel consists of two phases: ferrite and perlite. This is the reason for this steel's low resistance to a number of aggressive environments. Despite this weakness, this steel is widely used in industry. The reason for its popularity is relatively low price and ease of joining in the process of manufacturing welded constructions. S235JR steel is often used in construction works in the NaCl environment. The corrosive processes occurring in the sodium chloride environment depend on the concentration and the state of the environment. A lot of papers showing corrosion processes in this environment use NaCl as an aerosol. Industry also needs information on the corrosion resistance of this steel in aqueous solution of NaCl. The experiment was performed with low carbon S235JR (1.0038) steel designation according to EN 10025-2:2004, plate - thickness t = 5 mm. Steel was held in aqueous solution for 432 hours testing its wear every 48 hours. Corrosion tests show that tested steel in both corrosive environments are characterized through a continue corrosion. Roughness parameters for every one of research times are determined and the level of steel corrosion. Loss of weight during the steel retention process in NaCl was determined in g / m2 and mm / year. The dependence of corrosion time on steel surface quality was determined.Keywords: steel, structural steel, corrosion, corrosion rate, roughness
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