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Effect of pH on the Corrosion Behavior of Aluminium Alloy Welded Plate in Chloride Solutions

Author Affiliations

  • 1Departmentof Chemistry, Sathyabama University, Jeppiaar Nagar, Chennai-600119, INDIA
  • 2 Materials Characterization Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Trivandrum, INDIA

Res.J.chem.sci., Volume 3, Issue (6), Pages 74-80, June,18 (2013)


The corrosion behavior of aluminium alloy AA2219-T87 gas tungsten arc welded (GTAW) plates in 0.6M NaCl solution at pH 6.5 and at pH 10 was investigated using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) techniques. The surface morphology of the welded plates was characterized by optical microscopy, scanning electron microscopy with energy dispersive x-ray analysis (EDX). The electrochemical measurements showed that the heat affected zone (HAZ) is more susceptible to general corrosion as well as pitting corrosion in near neutral and in alkaline NaCl solution when compared to the weld zone (WZ) and to the base metal (BM). The EDX analysis further revealed the segregation of CuAl2 intermetallic particles along the grain boundaries due to the welding heat temperature and is responsible for higher corrosion rate of HAZ. The charge transfer resistance obtained from EIS study confirmed the active dissolution of HAZ in alkaline NaCl solution than in near neutral NaCl solution.


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