Galvanic Corrosion Behaviors of Inconel 718-P110SS Couple in Brine Saturated with CO₂

The variety of tubular goods are various in oil fields,so the connection of different mateials is inevitabe in working.Galvanic corrosion behaviors of Inconel 718-P110SS in brine saturated with CO2 were studied by potentiodynamic polarization curves,galvanic method and immersion test.The surface corrosion morphology of the couple samples was observed by means of SEM.The results showed that the free corrosion potential of two samples decreased,and the couple current density increases with the rise of solution temperature when the concentration of Cl- was invariable.The corrosion rate of P110SS increased obviously under coupling condition.