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    STUDIA CHEMIA - Issue no. 2 / 2009  
         
  Article:   EVALUATION OF SOME AMINO ACIDS AS BRONZE CORROSION INHIBITORS IN AQUEOUS SOLUTION.

Authors:  SIMONA VARVARA, MARIA POPA, GABRIEL RUSTOIU, ROXANA BOSTAN, LIANA MUREŞAN. 		 
       
         
  Abstract:   A comparative study of the efficiency of two innoxious amino acids derivatives (DL alanine and DL cysteine) on bronze corrosion in 0.2 g/L NaHCO3 0.2 g/L Na2SO4 aqueous solution (pH 5), was studied by electrochemical impedance spectroscopy and polarization measurements. The two amino acids are non-hazardous towards human beings or the environment and are intended to be used as corrosion inhibitors in the stabilization treatments of the Bronze Age archaeological artefacts belonging to the National Museum of Union in Alba Iulia (Romania). Consequently, the composition of the contemporary bronze samples used in the corrosion testing was chosen close to that of several Bronze Age artefacts (XIIth century B.C.) discovered in Transylvania (Romania) after a preliminary investigation by X-ray fluorescence spectrometry. The electrochemical investigations showed that the two innoxious amino acids have fairly good inhibiting properties for bronze corrosion, acting mainly as cathodic inhibitors. Their inhibition action could be attributed to the ability of the amino acids to adsorb on the bronze surface and to form an organic layer which protects the metal from corrosion. In the investigated experimental conditions, the best protection of bronze was obtained in the presence of 0.1 mM cysteine (90%). The impedance measurements revealed that the inhibitor effectiveness of the optimal concentrations of amino acids is time-dependent.

Keywords: bronze, corrosion, non toxic corrosion inhibitors, amino acids 		 
         
     
         
         
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