Abstract
The effect of the filler metal type, welding process and the welding pass number on the corrosion behavior of Incoloy 825 Ni-based alloy to SAF 2507 super duplex stainless steel weld zones were addressed utilizing scanning electron microscopy, cyclic potentiodynamic polarization and electrochemical impedance spectroscopy. The results detailed the formation of some secondary phases in the weld metals. The welds employing Ni-based filler wires revealed the highest general corrosion resistance, while super duplex stainless steel weld metals displayed the best pitting corrosion behavior. Pulsed current gas tungsten arc welding and super duplex stainless steel filler metal were recommended to obtain the optimum surface corrosion resistance.
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