Researches on the Intergranular Corrosion and Pitting Corrosion Resistances of Ni-Cr-Mo-Cu Alloys

In circumstances of the Cr, Mo elements with certain amount, by changing the mass fraction of copper(1%~5%), a new Ni-Cr-Mo-Cu corrosion resistant alloy has been prepared of which the resistance ability to intergranular corrosion and pitting corrosion has been then analysed by using chemical immersion, electrochemical(polarization curve, cyclic voltammetry). Experimental results have shown that the Ni-Cr-Mo-Cu alloy with w(Cu)=1%~5% had excellent resistance to intergranular corrosion and pitting corrosion performance, relatively speaking the resistant to intergranular corrosion and pitting corrosion performance of nickel-base alloy with w(Cu)=2% was poor while the nickel-base alloy with w(Cu)=5% had better resistance performance to intergranular corrosion and pitting; and the behavior and characteristics of the test alloy intergranular electrochemical corrosion and pitting corrosion has met exactly with that of their immersion.