A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments

Chemical and physical behavior including corrosion performance, thermal conductivity and visual color change of the copper-based alloys brass and bronze have been studied prior and after corrosion in acidic, alkaline and saline media. The concentrations of 0.5 M H2SO4, 0.5 M NaOH and 0.5 M NaCl were...

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Main Authors: Samiul Kaiser, Mohammad Salim Kaiser
Format: Article
Language:English
Published: International Association of Physical Chemists (IAPC) 2020-07-01
Series:Journal of Electrochemical Science and Engineering
Subjects:
Online Access:https://pub.iapchem.org/ojs/index.php/JESE/article/view/877
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author Samiul Kaiser
Mohammad Salim Kaiser
author_facet Samiul Kaiser
Mohammad Salim Kaiser
author_sort Samiul Kaiser
collection DOAJ
description Chemical and physical behavior including corrosion performance, thermal conductivity and visual color change of the copper-based alloys brass and bronze have been studied prior and after corrosion in acidic, alkaline and saline media. The concentrations of 0.5 M H2SO4, 0.5 M NaOH and 0.5 M NaCl were used in which copper and copper-alloy samples were immersed and left to corrode at room temperature for 28 days. The experiments were performed prior and after corrosion, using conventional gravimetric measurements accompanied with measurements of thermal conductivity, microstructure and optical properties. The color change of different samples was also studied through tristimulus color parameter (L*, a* and b*) values. It is concluded that the corrosion rate of copper and copper alloys is greater in acidic than in salt and alkaline media. This is due to the extent of disruption of the passive film formed on the surfaces. In the cases of alkaline and salt media, the passive films on the surface remain stable to a large extent. Small increase of thermal conductivity takes place due to formation of a very thin film of oxide and hydroxide bonded to the surface. The environment also affects the color of copper and copper alloys by chemical changes like oxidation and formation of different intermetallics on the surfaces. A microstructural study of experimental materials confirms that corrosion after 28 days results in formation of pores on the surfaces in acidic environment, and passive film that grows thicker on the surfaces in alkaline and saline environments. Aluminum oxide that is more stable than zinc oxide causes better anti-corrosion performance and minimal color variation of bronze compared to brass, especially in acidic environment.
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spelling doaj.art-e4f847cf615b4fc8ac31cb7dd91f1fed2022-12-22T03:39:52ZengInternational Association of Physical Chemists (IAPC)Journal of Electrochemical Science and Engineering1847-92862020-07-0110437338410.5599/jese.877877A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environmentsSamiul Kaiser0Mohammad Salim Kaiser1Directorate of Advisory, Extension and Research Services, Bangladesh University of Engineering and Technology, Dhaka-1000, BangladeshDirectorate of Advisory, Extension and Research Services, Bangladesh University of Engineering and Technology, Dhaka-1000, BangladeshChemical and physical behavior including corrosion performance, thermal conductivity and visual color change of the copper-based alloys brass and bronze have been studied prior and after corrosion in acidic, alkaline and saline media. The concentrations of 0.5 M H2SO4, 0.5 M NaOH and 0.5 M NaCl were used in which copper and copper-alloy samples were immersed and left to corrode at room temperature for 28 days. The experiments were performed prior and after corrosion, using conventional gravimetric measurements accompanied with measurements of thermal conductivity, microstructure and optical properties. The color change of different samples was also studied through tristimulus color parameter (L*, a* and b*) values. It is concluded that the corrosion rate of copper and copper alloys is greater in acidic than in salt and alkaline media. This is due to the extent of disruption of the passive film formed on the surfaces. In the cases of alkaline and salt media, the passive films on the surface remain stable to a large extent. Small increase of thermal conductivity takes place due to formation of a very thin film of oxide and hydroxide bonded to the surface. The environment also affects the color of copper and copper alloys by chemical changes like oxidation and formation of different intermetallics on the surfaces. A microstructural study of experimental materials confirms that corrosion after 28 days results in formation of pores on the surfaces in acidic environment, and passive film that grows thicker on the surfaces in alkaline and saline environments. Aluminum oxide that is more stable than zinc oxide causes better anti-corrosion performance and minimal color variation of bronze compared to brass, especially in acidic environment.https://pub.iapchem.org/ojs/index.php/JESE/article/view/877copper-alloyscorrosionoxidationthermal conductivitycolormicrostructure
spellingShingle Samiul Kaiser
Mohammad Salim Kaiser
A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
Journal of Electrochemical Science and Engineering
copper-alloys
corrosion
oxidation
thermal conductivity
color
microstructure
title A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
title_full A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
title_fullStr A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
title_full_unstemmed A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
title_short A comparative study of chemical and physical properties of copper and copper alloys affected by acidic, alkaline and saline environments
title_sort comparative study of chemical and physical properties of copper and copper alloys affected by acidic alkaline and saline environments
topic copper-alloys
corrosion
oxidation
thermal conductivity
color
microstructure
url https://pub.iapchem.org/ojs/index.php/JESE/article/view/877
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