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Synergistic effect between cavitation erosion and corrosion for various copper alloys in sulphide-containing 3.5% NaCl solutions

Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-...

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Bibliographic Details
Published in:Wear 2020-06, Vol.450-451, p.203258, Article 203258
Main Authors: Song, Q.N., Tong, Y., Xu, N., Sun, S.Y., Li, H.L., Bao, Y.F., Jiang, Y.F., Wang, Z.B., Qiao, Y.X.
Format: Article
Language:English
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Summary:Cavitation erosion-corrosion (CE-C) behaviour of various copper alloys for ship propellers were investigated in sulphide-containing 3.5% NaCl solutions. Results indicate that the CE-C resistance remarkably decreases with increase in sulphide concentration for cast and friction stir processed nickel-aluminum bronzes. CE increases the current density by approximately two orders of magnitude and causes a positive potential shift when the sulphide concentration exceeds 50 ppm. The synergistic effect between CE and corrosion contributes greatly to CE-C degradation in sulphide solutions. However, the CE-C behaviour is insensitive to sulphide concentration for manganese-aluminum bronze and manganese brass. In all solutions, CE causes a positive potential shift and increases the current density by less than one order of magnitude. Mechanical attack dominates the CE-C damage. •CE-C behaviours of various copper alloys were studied in seawater with sulphide.•The sulphide has different effects on CE behaviour of different copper alloys.•The effect of CE on the electrochemical behaviour was analysed.•The synergistic effect between corrosion and CE was discussed.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2020.203258