Volume No. 2 Issue No.: 4B Page No.: 762-772 April-June 2008

 

PITTING CORROSION BEHAVIOUR OF SHIELDED METAL ARC WELDED FERRITIC STAINLESS STEEL

 

B. Kumaragurubaran*, T. Senthilkumar1, K. Shanmugam and V. Balasubramanian

1. Department of Automobile Technology, Anna University, Tiruchirappalli (INDIA)
2. Department of Manufacturing Engineering, Annamalai University, Chidambaram (INDIA)

 

Received on : October 21, 2007

 

ABSTRACT

 

Ferritic Stainless Steels (FSS) have useful properties in the wrought condition, welding is known to reduce toughness, ductility, and corrosion resistance because of grain coarsening and formation of martensite. Applications of these alloys involve exposure to high temperatures, such as for quenching racks and annealing boxes, and also for tanks for agricultural sprays, transformer cases and automotive applications. Type 409 is one of the most widely used FSS. They are cheap alternative to austenitic stainless steels. The heat of welding leads to grain coarsening in the heat affected zone (HAZ) and in the weld metal of FSS because they solidify directly from the liquid to the ferrite phase without any intermediate phase transformation. In this paper, the effect of weld metals on pitting corrosion behaviour of shielded metal arc welded ferritic stainless steel has been reported. The polarization studies of the weld samples have been carried out in non-deaerated 3.5% NaCl solution (of pH 1, 7 and 11) using (Gill AC) potentiostat. Micro structural examinations have been carried out using a light optical microscope incorporated with an image analyzing software.

 

Keywords : Ferritic Stainless Steel, Shielded Metal Arc Welding, Pitting Corrosion Potential, Corrosion, Heat affected zone

 

 

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