Influence of Purine on Brass Behavior in Neutral and Alkaline Sulphate Solutions

• Published in: International journal of electrochemical science Vol. 7; no. 12; pp. 11796 - 11810
• Main Authors: Radovanović, Milan B., Simonović, Ana T., Petrović, Marija B., Milić, Snežana M., Antonijević, Milan M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2012
• Subjects: brass; corrosion inhibiton; polarization; purine; polarization; brass; corrosion inhibiton; purine
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)16504-7

The behavior of Cu37Zn brass in the presence of purine in the wide concentration range (1·10-6mol/dm3-1·10-2mol/dm3) in a neutral and weakly alkaline 0.5mol/dm3 Na2SO4 solution is studied using potentiodynamic polarization and chronoamperometry. Potentiodynamic polarization shows that purine acts like mixed-type inhibitor with a stronger influence on the corrosion processes in the weakly alkaline sulphate solutions. Protective effect of purine is caused by the formation of the layer on the brass surface. Chronoamperometric measurements were confirmed results obtained potentiodynamic measurements, indicating that the stability of the protective layer increase with increasing concentration of the inhibitor. Adsorption of purine on the brass surface proceeds according to the Langmuir adsorption isotherm.