Study of the properties of a multi-component inhibitor used for water treatment in cooling circuits

摘要: This work is devoted to the corrosion inhibition of a carbon steel in 200 mg l−1 NaCl solution by an original multicomponent inhibitor: fatty amines association with phosphonocarboxylic acid salts and biocide at low dosage. Its principal advantage absence toxicity its biodegradability. Steady-state current–voltage curves were combined electrochemical impedance measurements characterize inhibitive properties each compound optimize concentration compounds mixture. Phosphonocarboxylic observed act as anodic inhibitor whereas mixed action was shown for amines. The efficiency increased when salt increase did not improve inhibition. Optimal concentrations determined. X-ray photoelectron spectroscopy (XPS) used analyse layer formed on metal surface film composed iron oxide/hydroxide mixture incorporating organic compounds. molecules interact oxides.