engleski

Determination of Critical Temperature for Pitting Corrosion Occurrence at Welded 2205 Duplex - Duplex Steel

The aim of this paper was determination of the critical temperature at which pitting corrosion occurs in welded 2205 duplex-duplex steel. Its chemical composition and properties are given. Pitting corrosion and the conditions of its occurrence as well as the measures for protection against it have been specially treated. Also, duplex steel welding preparation procedures are described. The welding process of the specimen as well as its properties after welding is given as well. The microstructure of the specimen and its austenite-ferrite ratios were obtained and analysed. Susceptibility to pitting corrosion was tested in simulated seawater atmosphere. Pitting corrosion resistance tests through conducted surface roughness analysis were performed and discussed for each set of parameters, which included time and temperature. The results showed that temperature elevation has a significant influence on pitting corrosion occurrence. Measured critical temperature value for pitting corrosion occurrence at welded 2205 duplex-duplex steel in simulated seawater conditions was 40 °C.

Stainless steel, Duplex, Pitting Corrosion, Welding, Seawater

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