The cathodic adsorption beheaviors of thiourea and 4 of its derivatives on iron in hydrochloric acid and sulphuric acid were investigated by polarizations curves. The accordance of the adsorption beheavior of thiourea on iron in sulphuric acid with Temkin isotherm was deduced from hynamics, and the thiourea took part in the reaction of HER, this phenomena is a negative catalytic effect. The adsorption beheavoris of thiourea and its 4 derivatives and iron in hydrochloric acid was found to be in accord with Langmuir isotherm and this conclusion was deduced from thermodynamics, this phenomena is a blocking effect.
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