Surfactants　play　an　essential　role　in　the　field　of　metal　corrosion　inhibition　by　adsorption.　In　this　work,　novel　Schiff　base-based　cationic　Gemini　surfactants　were　synthesized,　purified,　and　characterized,　which　particular　chemical　structures　benefit　to　adsorbing　on　the　metal　surface　and　thus　restricting　metal　corrosion.　The　corrosion　inhibiting　mechanism　of　the　synthesized　surfactants　was　researched　by　electrochemical　impedance　spectroscopy,　potentiodynamic　polarization,　and　weight　loss　measurements.　It　was　found　that　the　surfactants　behave　as　mixed-type　inhibitors,　and　the　adsorption　follows　Langmuir　isotherm.　SG-16　presents　the　best　anti-corrosion　effect;　its　corrosion　inhibition　efficiency　reaches　93.5%　for　Q235　carbon　steel　and　83.38%　for　printed　circuit　boards.　Scanning　electron　microscopy　and　X-ray　photoelectron　spectroscopy　were　applied　to　investigate　the　sample＇s　surface　morphology,　which　showed　that　there　were　surfactants,　oxide,　and　very　few　corrosion　traces　on　the　sample＇s　surface.　These　experimental　results　show　that　the　novel　Gemini　surfactants　are　efficient　corrosion　inhibitors　for　metal.　©　2021