TY - JOUR
T1 - Comparison study on the corrosion behavior of aluminum alloys in different acidic media
AU - Adams, Feyisayo Victoria
AU - Akinwamide, Samuel Olukayode
AU - Obadele, Babatunde
AU - Olubambi, Peter Apata
N1 - Funding Information:
The authors wish to appreciate Centre for Nanomechanics and Tribocorrosion, University of Johannesburg, Johannesburg, South Africa where this research was carried out and for funding the research.
Publisher Copyright:
© 2019 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Symposium on Nanostructured, Nanoengineered and Advanced Materials.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Electrochemical study to compare the corrosion resistance of three different aluminum alloys (AA8011, AA4017 and AA1200) in organic acid solutions (nitric and acetic acids) was carried out. Polarization technique was used to determine the corrosion behavior of the alloys in the acid solutions, while potentiometric technique was used to study the passivity of the alloys over time. The surface analysis was carried out on the alloys' surfaces to know the morphological changes that took place on the surface of the alloys using scanning electron microscopy (SEM). Alloy AA4017 showed the least tendency to pit in acetic acid solution with alloy AA8011 showing the highest susceptibility to pitting in the acidic solutions. All the alloys on the other hand showed high tendencies to pit in nitric acid solution. Considering the rate of corrosion of the alloys in both solutions, alloy AA8011 had corrosion rate of 0.0873 mm/yr., which was the highest in acetic acid solution, while alloy AA1200 had the least corrosion rate of 0.0045 mm/yr. in the solution. Meanwhile, alloy AA4017 exhibited the highest corrosion rate of 0.0552 mm/yr. and alloy AA1200 had the least corrosion rate of 0.0126 mm/yr. in nitric acid solution. These results showed that the AA4017 and AA1200 alloys corroded more in nitric acid solution than in acetic acid solution. Potentiometric test results showed the formation of more stable passive films in nitric acid than in acetic acid solution. The SEM micrographs showed pits formation on the alloys in all the acidic solutions.
AB - Electrochemical study to compare the corrosion resistance of three different aluminum alloys (AA8011, AA4017 and AA1200) in organic acid solutions (nitric and acetic acids) was carried out. Polarization technique was used to determine the corrosion behavior of the alloys in the acid solutions, while potentiometric technique was used to study the passivity of the alloys over time. The surface analysis was carried out on the alloys' surfaces to know the morphological changes that took place on the surface of the alloys using scanning electron microscopy (SEM). Alloy AA4017 showed the least tendency to pit in acetic acid solution with alloy AA8011 showing the highest susceptibility to pitting in the acidic solutions. All the alloys on the other hand showed high tendencies to pit in nitric acid solution. Considering the rate of corrosion of the alloys in both solutions, alloy AA8011 had corrosion rate of 0.0873 mm/yr., which was the highest in acetic acid solution, while alloy AA1200 had the least corrosion rate of 0.0045 mm/yr. in the solution. Meanwhile, alloy AA4017 exhibited the highest corrosion rate of 0.0552 mm/yr. and alloy AA1200 had the least corrosion rate of 0.0126 mm/yr. in nitric acid solution. These results showed that the AA4017 and AA1200 alloys corroded more in nitric acid solution than in acetic acid solution. Potentiometric test results showed the formation of more stable passive films in nitric acid than in acetic acid solution. The SEM micrographs showed pits formation on the alloys in all the acidic solutions.
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U2 - 10.1016/j.matpr.2020.05.781
DO - 10.1016/j.matpr.2020.05.781
M3 - Conference article
AN - SCOPUS:85091821944
SN - 2214-7853
VL - 38
SP - 1040
EP - 1043
JO - Materials Today: Proceedings
JF - Materials Today: Proceedings
T2 - 2020 International Symposium on Nanostructured, Nanoengineered and Advanced Materials, ISNNAM 2020
Y2 - 30 April 2020 through 3 May 2020
ER -