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Polarization curve test and EIS are used to study the corrosion inhibition effect of silane modification on aluminum alloy (ADC12) in 3% NaCl. The effects of functional group of silane coupling agent, pH, and concentration have been studied. Small and polar group of silane coupling agent is benefit for the protection effect. The optimal conditions of passivation solution are pH of 1.8 and the silane coupling agents concentration of 0.8%.