Abd Elhamid, S., El meleigy, A., Attia, A., El warraky, A., Abd-El-Wahab, S. (2020). Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study. test, 63(3), 907-919. doi: 10.21608/ejchem.2019.14884.1916
Shaimaa Abd Elhamid; Abeer El meleigy; Adel Attia; Ali El warraky; Saad Abd-El-Wahab. "Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study". test, 63, 3, 2020, 907-919. doi: 10.21608/ejchem.2019.14884.1916
Abd Elhamid, S., El meleigy, A., Attia, A., El warraky, A., Abd-El-Wahab, S. (2020). 'Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study', test, 63(3), pp. 907-919. doi: 10.21608/ejchem.2019.14884.1916
Abd Elhamid, S., El meleigy, A., Attia, A., El warraky, A., Abd-El-Wahab, S. Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study. test, 2020; 63(3): 907-919. doi: 10.21608/ejchem.2019.14884.1916

Corrosion Behaviour of Copper– nickel Alloys in LiBr Solutions: A Comparative Study

Egyptian Journal of Chemistry
Article 79, Volume 63, Issue 3, March 2020, Pages 907-919    PDF (3.29 M)
Document Type: Original Article
DOI: 10.21608/ejchem.2019.14884.1916
Authors
Shaimaa Abd Elhamid1; Abeer El meleigy1; Adel Attia1; Ali El warraky* 1; Saad Abd-El-Wahab2
1Department of Physical Chemistry, National Research Center, Giza, Egypt.
2Physical Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo, Egypt.
Abstract
THE ANODIC potentiodynamic cyclic polarization behavior of Cu/10 Ni and Cu/30 Ni alloys in different wide range of LiBr concentrations from 10-1 to 9 M was investigated. The results obtained showed that the breakdown potential, hysteresis loop area and passive current were recorded at higher value of potentials in case of Cu/10 Ni in comparison with Cu/30 Ni. The current density showed higher values during the first few moment of polarization of both alloys studied as result of the changes the taking place on the surface. At 5x10-1 M of LiBr, in case of Cu/10 Ni, two breakdown potentials yielded two hysteresis loops, one of them was at 700 mV and the second was at more anodic potential. These are not recorded in case of Cu/30 Ni where pitting corrosion was manifested at 2 and 4 M LiBr only. The current – time measurement and surface examination of the electrode in case of Cu/30 Ni at 3x10-1 and 5x10-1M LiBr showed that the film formed at low anodic potential of 150 mV clarify the formation of small number of initiated pits which are surrounded by a passive and protective film of doped Cu2O and the surface shown enrichment of Ni. While at all the potential studied for the Cu/10 Ni and Cu/30 Ni the surface of the alloy suffered from denickelification.
Keywords
Absorption-refrigeration systems; Corrosion; Cu/10 Ni; Cu/30 Ni; Lithium bromide; Surface analysis
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