A Comprehensive Investigation of Corrosion Efficiency of Cu-10Ni Alloy in Hybrid Cr3+/ Ni2+ with Tungstate in Chloride Media

Document Type : Original Article


1 Department of Chemistry, Faculty of Science (Girls), Al-Azhar University, P.O. Box: 11754, Yousef Abbas Str., Nasr City, Cairo, Egypt

2 Mining, Petroleum, and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, 12613, Egypt


Pipes that carry saltwater, and desalination facilities are all typical applications for the Cu-10Ni alloy. Examining the surface characterization and the corrosion performance of Cu-10Ni alloy after immersion in hybrid Cr3+/ Ni2+ solutions with tungstate in either 0.5 M HCl or 1 M NaCl. The influence of the addition of hybrid Cr3+/ Ni2+ with tungstate on the corrosion of Cu-10Ni alloy in 1M HCl or 0.5M NaCl was investigated with weight loss (WTL) method and open circuit potential (OCP) measurements over 7 days to 90 days. Also, potentiodynamic polarization (POT) and cyclic voltammetry (CYV) were performed. The findings show that tungstate has a low IE in comparison to a hybrid solution containing Cr3+/ or Ni2+ ions. The solution's Cl- continuously assaults the protective layer as immersion time increases, rupturing it. Following 7 days, the tungstate hybrid Cr3+ has the highest IE 82%; and 68% in HCl and NaCl, respectively. Thus, the IE values in HCl and NaCl after 90 days, 67.1% and 97.9%, respectively. Furthermore, the hybrid Cr3+/ or Ni2+ with tungstate results in a slight difference in the anodic, cathodic, and corrosion potential Tafel constant values. An increase in the IE% values of the hybrid Cr3+ with tungstate in HCl and NaCl from 58.0 % to 82.3 % indicates a better surface coverage of the Cu-10Ni alloy. The examination of the surface morphology is accomplished using an energy-dispersive X-ray analysis (EDX) and a scanning electron microscope (SEM).


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