Electrochemical corrosion study of Sn-XAg-0.5Cu alloys in 3.5% NaCl solution

Udit Surya Mohanty, Kwang Lung Lin

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The electrochemical corrosion behavior of Sn-XAg-0.5Cu alloys in 3.5% NaCl solution was examined using potentiodynamic polarization techniques. The Ag content in the alloy was varied from 1 to 4 wt%. The polarization curves obtained for the alloys show an active-passive transition followed by a transpassive region. Sn-XAg-0.5Cu alloys with higher Ag content (>2 wt%) show a strong tendency toward passivation. The passivation behavior has been ascribed to the presence of both SnO and SnO2 on the anode surface. Increase in Ag content from 1 to 4 wt% results in a decrease in the corrosion-current density (Icorr) and linear polarization resistance (LPR) of the alloy. Nevertheless, the corrosion potential (Ecorr) shifts toward negative values, and a decrease in corrosion rate is observed. The presence of Cl- ion initiates pitting and is responsible for the rupture of the passive layer at a certain breakdown potential. The breakdown potential, (EBR) decreases and shifts toward more noble values with increase in Ag content in the alloy. Surface analyses by x-ray photoelectron spectroscopy (XPS) and Auger depth profile studies confirmed the formation of both Sn(II) and Sn(IV) oxides in the passive layer.

Original languageEnglish
Pages (from-to)2573-2581
Number of pages9
JournalJournal of Materials Research
Volume22
Issue number9
DOIs
Publication statusPublished - 2007 Sep

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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