The research on the galvanic corrosion behavior of QAl 9-4 aluminum bronze with the plasma electrolytic oxidation and TA31 titanium alloy

The QAl 9-4 aluminum bronze was treated with plasma electrolytic oxidation in this article, resulting in a comparatively thick oxide film that is about 24μm thick on the surface. The oxide film was mainly composed of α-Al₂O₃, Cu₂O and γ-Al₂O₃. After the experiment, the corrosion resistance improved, the corrosion potential slightly increased, and the electrochemical impedance significantly increased. The TA31 titanium alloy served as the cathode, and QAl 9-4 aluminum bronze with its plasma electrolytic oxidation film layer served as the anode after galvanic coupling of QAl 9-4 alloy with its plasma electrolytic oxidation and TA31 titanium alloy. QAl 9-4 aluminum bronze occurred for plasma electrolytic oxidation，which reduced the corrosion potential and electric corrosion current coupled with the TA31 alloy puppet and the corrosion rate of QAl 9-4 aluminum bronze, while inhibiting the occurrence of electric puppets.