Corrosion and Wear Properties of Different Weld Overlays

Different weld overlays were welded by using different weld processes. Both Ni based alloys and Co based alloys were welded on either a c-steel (Weldox 700) or a stainless steel similar to superduplex (UNS 32760). The weld overlays were investigated and compared with respect to effect of the number of layers, chemical compositions of the surface, critical crevice corrosion temperature, microstructure, hardness, friction coefficient, adhesive and abrasive wear resistance. Wear testing was performed on the Co based alloys only. Some electrolytically deposited Ni-coatings were also investigated with respect to crevice corrosion. Both an austenitic and a superduplex stainless steel were tested as reference materials.