CORROSION PERFORMANCE OF CLADDED STEELS AND STAINLESS STEELS

A new generation of clad pipes are under consideration in the oil industry as a cost effective alternative to conventional solid pipes made of corrosion resistant materials. Materials such as austenitic, duplex stainless steels and nickel based alloys are used as clad metals and were examined under accelerated test conditions according to ASTM and MTI standards, to evaluate their corrosion resistance. Incoloy cladded carbon steel line pipe material was tested to assess the galvanic coupling effect and inter-granular corrosion resistance. Tafel plots were plotted and polarisation resistance values were calculated separately for carbon steel and incoloy clad material. Coupled potentials and the corrosion rate of steel were also evaluated. The pitting and crevice corrosion resistance of stainless steels such as 304, 316, Ferrillium 255, duplex stainless steels and nickel based alloys were determined and compared using rest results.