Corrosion Resistance of Welded Joint of SAF2205/16MnR Explosion Composite Plate

SAF2205/16MnR explosion composite plates were welded by tungsten inert gas arc welding (TIG) and shielded metal arc welding (SMAW),respectively.Pitting corrosion rate of the joints was tested using the chemical immersion method and polarization curves of the joints were obtained by the electrochemical corrosion test.Moreover,corrosion morphology of the weld metal was observed by using optical microscope.The results show that the pitting corrosion rates of both the SMAW joint and TIG joint were very low in different corrosion solutions such as 6%FeCl3+H2O and 6%FeCl3+15%HCl+H2O,respectively.At room temperature in 3.5% NaCl solution the capability of electrochemical corrosion resistance was in sequence of the stainless steel>TIG joint>SMAW joint.The value of corrosion potential for all the three metals was about -0.3 V,the two welded joints possessed good corrosion resistance.