The effect of phosphate ions on the electrochemical behaviour of brass in sulphate solutions

Kilincceker G., ERBİL M.

MATERIALS CHEMISTRY AND PHYSICS, vol.119, pp.30-39, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 119
  • Publication Date: 2010
  • Doi Number: 10.1016/j.matchemphys.2009.07.040
  • Journal Name: MATERIALS CHEMISTRY AND PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.30-39
  • Keywords: Alloys, Oxides, Corrosion, Electrochemical techniques, HYDROCHLORIC-ACID SOLUTIONS, ALKALINE-SOLUTIONS, SULFURIC-ACID, CORROSION-INHIBITORS, SODIUM-PERCHLORATE, ANODIC-DISSOLUTION, CHLORIDE SOLUTIONS, PITTING CORROSION, ACETATE SOLUTIONS, AQUEOUS-SOLUTIONS
  • Çukurova University Affiliated: Yes

Abstract

In this study, we have investigated the effect of phosphate ions on the corrosion behaviour of brass in 0.1 M Na(2)SO(4) solution in acidic (pH 2.1), neutral (pH 7.2) and alkaline (pH 12.3) solutions. For this purpose, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) techniques were used. The surface morphology of the metal surface after exposed to corrosive medium was investigated by scanning electron microscopy (SEM). The effect of temperature has also studied in the temperature range from 293 K to 353 K. Some thermodynamic parameters were calculated and discussed. It was found that, PO(4)(3-) ions could inhibit the corrosion of brass in Na(2)SO(4) solution. However, the inhibition efficiency decreased with increasing temperature. The inhibition effect Of PO(4)(3-) ions was explained by complex formation between phosphate ions and corrosion products which physically adsorbed on the metal surface. (C) 2009 Elsevier B.V. All rights reserved.