Study of Corrosion Behaviour of Ferritic Stainless Steel Welded Joint

Ferritic stainless steel has drawn greater attention due to their lower costs, good corrosion resistance and mechanical properties. In the present work microstructure of welded-joint samples of ferritic stainless steel (AISI 430) and their corrosion properties have been investigated. For the experimental work MIG welding was used to prepare the welded joint samples. The microstructure of different zones of the welded joints was studied under optical microscope. To investigate the corrosion behaviour H2SO4, HCl, NaCl and NaOH were taken as the corrosive media. These solutions represent acid, salt and base environments that are usually encountered by the test metal in actual service. Tafel extrapolation test was conducted to study the corrosion behaviour. The highest corrosion rate was found in case of NaCL. The test specimens have shown more severity in alkaline solution than acidic medium.