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Effect of Chloride Ions on the Corrosion Behavior of Al – Zn Alloy in NaOH Solution at Four Different Temperatures | ||
| Al-Khwarizmi Engineering Journal | ||
| Article 1, Volume 4, Issue 4, 2008, Pages 26-36 | ||
| Authors | ||
| Hind B. Al-Atrakchy; Hanaa A. Al-Kaisy; Rana A. Majed | ||
| Abstract | ||
| This research involves study effect of chloride ions in concentration range (0.01 – 0.50 mol.dm-3) on the corrosion behavior of Al-Zn alloy in basic media of 1x10-3 mol.dm-3 NaOH at pH=11 and four different temperatures in the range (298-313 K). Cathodic and anodic Tafel slopes (bc &ba) and transfer coefficients (αc & αa) were calculated and the results interprets according to the variation of the rate – determining steps. The results also indicate that the chloride ions are bonded chemically in the interface as an initial step of formation of different mixed oxohydroxy – and chloro complexes. Polarization resistance (Rp) is calculates and interprets the different polarization behavior because of addition of chloride ions to the basic media. | ||
| Keywords | ||
| Zn alloy; Effect of chloride ion; Corrosion behavior in basic medium | ||
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