EFFECT OF ZNCONCENTRATION IONS ON CORROSION BEHAVIOR OF ZINC PHOSPHATE CONVERSION COATING ON AL-MG-ZN ALLOY | ||||
| Journal of Al-Azhar University Engineering Sector | ||||
| Article 34, Volume 14, Issue 50, January 2019, Page 136-147 PDF (347.68 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/auej.2019.28516 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A M Omar1; M M Sadawy1; R M Khalil1, 2 | ||||
| 1Mining and Pet. Dept., Faculty of Eng., Al-Azhar University, Nasr City Cairo, Egypt | ||||
| 2Petroleum pipelines Co. Egypt | ||||
| Abstract | ||||
| The effect of Zn2+ concentrations on the formation of zinc phosphate conversion coatings (ZPCCs) on Al-Mg-Zn alloy was investigated. The morphology of the coatings was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion resistances of the coated and uncoated samples were evaluated by open circuit potential and potentiodynamic polarization techniques. The results revealed that the conversion coating consists of hopeite as a single phase. Furthermore, the results indicated that the corrosion resistance of the coated Al-Mg- Zn samples was found to increase with increasing Zn2+ concentration. | ||||
| Keywords | ||||
| Zinc phosphate coating; Aluminum alloys; Corrosion Resistance | ||||
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