Adsorption　of　the　quaternary　ammonium　gemini　surfactants　alkanediyl-α,ω-bis-(dimethyl　dodecyl　ammonium　bromide),　referred　as　C12-s-C12·2Br　(s　=　2,3,4,6),　on　the　zinc　surface　in　0.5　mol/L　H2SO4solution　was　investigated　using　gravimetric　measurements.　The　adsorption　of　C12-s-C12·2Br　on　the　zinc　surface　accorded　to　the　Frumkin　isotherm　model.　The　maximal　inhibition　efficiency　for　zinc　was　reached　at　the　saturated　adsorption　concentration　Ccthat　was　larger　than　its　critical　micelle　concentration　in　0.5　mol/L　H2SO4solution.　The　inhibition　efficiency　for　zinc　slightly　reduced　with　increasing　s　since　C12-s-C12·2Br　formed　different　morphologies　of　the　surface　aggregates.　The　adsorption　ability　and　the　inhibition　efficiency　for　corrosion　reduced　with　increment　of　temperature.　©　2006　Elsevier　B.V.　All　rights　reserved.