Influence of pre-immersion aeration conditions on corrosion product films and erosion-corrosion resistance of 90/10 and 70/30 copper-nickel tubes in 1 wt% NaCl solution

The influences of pre-immersion aeration conditions on the corrosion product films and their erosion-corrosion resistance of 90/10 and 70/30 copper-nickel tubes are investigated. Results show that sealed immersion inhibits the formation of protective films on 90/10 and 70/30 tubes and thus worsens the erosion-corrosion resistance, which is related to the nanosized Mn/O particles near the film/substrate interface. Aerated immersion promotes the formation of protective film on 90/10 copper-nickel tube and improve the film recovery ability of 70/30 copper-nickel tube. Moreover, the features of the corrosion product film with good erosion-corrosion resistance are identified.