The aim of the work is to assess the inhibition performance of hexa propylene glycol cyclotiphosphazene (HPGCP) on the corrosion of carbon steel in 3% NaCl solution and examine its inhibition mechanism, furthermore, to elucidate the possible adsorption model on the corroding carbon steel surface and advance the understanding of interactions between the inhibitor molecules and the carbon steel surfaces. The effect of this inhibitor on the carbon steel was studied by weight loss and quantum chemical calculations. The adsorption of HPGCP on the carbon steel surface was well described by the Langmuir adsorption model. The inhibition mechanism was determined by potential of zero charge measurements and some electronic parameters.
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