<p>This resarch systematically investigated the alternating current (AC) interference corrosion of B30 alloy in simulated ocean environment. The results exhibit that the imposed AC apparently facilitates the dissolution of surface passive film, augments the level of internal flaws in the film, diminishes its protective effect, and reduces the anti-corrosion performance of the alloy. As AC density rises, the adsorption of H⁺/Cl⁻ at the flaws of passivation film is promoted, causing the film integrity and stability to decrease and deteriorating the local corrosion degree. The pits produced on the alloy result from the selective dissolution of the Cu element.</p>