Oerlikon Supranel CuNi7 description: SUPRANEL CuNi7 is a basic-coated MMA electrode for alloy types CuNi 70-30 or CuNi 90-10. Suitable for joining and surfacing, the weld metal has an excellent resistance to salt water corrosion. Applications include offshore construction, desalination plant, evaporators, condensers etc, in salt and sea water processing systems and shipbuilding. SUPRANEL CuNi7 is suitable for surfacing and cladding provided the need for an appropriate buttering layer is addressed, normally either alloy 400 or pure nickel.