Adsorption　of　the　quaternary　ammonium　gemini　surfactants　alkanediyl-alpha,omega-bis-(dimethyl　dodecyl　ammonium　bromide),　referred　as　C-12-s-C-12　center　dot　2Br　(s　=　2,3,4,6),　on　the　zinc　surface　in　0.5　mol/L　H2SO4　solution　was　investigated　using　gravimetric　measurements.　The　adsorption　of　C-12-s-C-12-2Br　on　the　zinc　surface　accorded　to　the　Frumkin　isotherm　model.　The　maximal　inhibition　efficiency　for　zinc　was　reached　at　the　saturated　adsorption　concentration　C-c　that　was　larger　than　its　critical　micelle　concentration　in　0.5　mol/L　H2SO4　solution.　The　inhibition　efficiency　for　zinc　slightly　reduced　with　increasing　s　since　C-12-s-C-12-2Br　formed　different　morphologies　of　the　surface　aggregates.　The　adsorption　ability　and　the　inhibition　efficiency　for　corrosion　reduced　with　increment　of　temperature.　(c)　2006　Elsevier　B.V.　All　rights　reserved.