A Study on the Corrosion Behavior of 7072/3004/7072 Clad Aluminum Alloy in Different Media

I. Tunc; B. D. Karahan; O. Keles

doi:10.1007/s11665-020-04948-x

A Study on the Corrosion Behavior of 7072/3004/7072 Clad Aluminum Alloy in Different Media

I. Tunc, B. D. Karahan, O. Keles^*

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Cladding is an easy and economical method to design multifunctional aluminum structures with improved corrosion resistance, mechanical strength, and physical appearance. In this study, the electrochemical properties and corrosion behavior of an aluminum-clad product made of 7072/3004/7072 aluminum alloys were investigated by Tafel extrapolation and impedance spectroscopy. 3004 aluminum sheet was used as core, and it was cladded with 7072 aluminum sheets on both sides. The long-term corrosion behavior of clad samples was examined after being immersed in tap water, rainwater, and 3.5 wt.% NaCl solution for 4 weeks. The results show that because of the potential difference between 7072 and 3004 aluminum alloys, 7072 alloy behaves more anodic and corrodes preferentially (with a slower rate) compared to 3004 aluminum alloy. Cladding 3004 with embossed 7072 alloy improves the corrosion resistance of the alloy. Moreover, the electrolyte comparison demonstrates that the carbonate-forming ions (such as Ca) in tap water and HCO₃⁻, NO₃⁻, and SO₄²⁻ in rainwater decelerate the corrosion rate.

Original language	English
Pages (from-to)	4506-4514
Number of pages	9
Journal	Journal of Materials Engineering and Performance
Volume	29
Issue number	7
DOIs	https://doi.org/10.1007/s11665-020-04948-x
Publication status	Published - 1 Jul 2020

Bibliographical note

Publisher Copyright:
© 2020, ASM International.

Funding

Authors would like to thank Prof. Dr. Gultekin Goller and Mr. Huseyin Sezer for proving necessary laboratory equipments and helping with SEM analysis, to Mr. Bora Tarhan for supplying clad aluminum sheet for experiments, to Mr. Husnu Ozturk for metallographic analyses, and to Istanbul Metropolitan Municipality Environmental Protection Directorship Anatolian Side Environmental Laboratories for analyzing the chemical composition of the electrolytes.

Funders	Funder number
Istanbul Metropolitan Municipality Environmental Protection Directorship Anatolian Side Environmental Laboratories

Keywords

3004
7072
Tafel extrapolation
cladding
corrosion behavior
impedance spectroscopy

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10.1007/s11665-020-04948-x

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abstract = "Cladding is an easy and economical method to design multifunctional aluminum structures with improved corrosion resistance, mechanical strength, and physical appearance. In this study, the electrochemical properties and corrosion behavior of an aluminum-clad product made of 7072/3004/7072 aluminum alloys were investigated by Tafel extrapolation and impedance spectroscopy. 3004 aluminum sheet was used as core, and it was cladded with 7072 aluminum sheets on both sides. The long-term corrosion behavior of clad samples was examined after being immersed in tap water, rainwater, and 3.5 wt.% NaCl solution for 4 weeks. The results show that because of the potential difference between 7072 and 3004 aluminum alloys, 7072 alloy behaves more anodic and corrodes preferentially (with a slower rate) compared to 3004 aluminum alloy. Cladding 3004 with embossed 7072 alloy improves the corrosion resistance of the alloy. Moreover, the electrolyte comparison demonstrates that the carbonate-forming ions (such as Ca) in tap water and HCO3−, NO3−, and SO42− in rainwater decelerate the corrosion rate.",

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AU - Keles, O.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Cladding is an easy and economical method to design multifunctional aluminum structures with improved corrosion resistance, mechanical strength, and physical appearance. In this study, the electrochemical properties and corrosion behavior of an aluminum-clad product made of 7072/3004/7072 aluminum alloys were investigated by Tafel extrapolation and impedance spectroscopy. 3004 aluminum sheet was used as core, and it was cladded with 7072 aluminum sheets on both sides. The long-term corrosion behavior of clad samples was examined after being immersed in tap water, rainwater, and 3.5 wt.% NaCl solution for 4 weeks. The results show that because of the potential difference between 7072 and 3004 aluminum alloys, 7072 alloy behaves more anodic and corrodes preferentially (with a slower rate) compared to 3004 aluminum alloy. Cladding 3004 with embossed 7072 alloy improves the corrosion resistance of the alloy. Moreover, the electrolyte comparison demonstrates that the carbonate-forming ions (such as Ca) in tap water and HCO3−, NO3−, and SO42− in rainwater decelerate the corrosion rate.

AB - Cladding is an easy and economical method to design multifunctional aluminum structures with improved corrosion resistance, mechanical strength, and physical appearance. In this study, the electrochemical properties and corrosion behavior of an aluminum-clad product made of 7072/3004/7072 aluminum alloys were investigated by Tafel extrapolation and impedance spectroscopy. 3004 aluminum sheet was used as core, and it was cladded with 7072 aluminum sheets on both sides. The long-term corrosion behavior of clad samples was examined after being immersed in tap water, rainwater, and 3.5 wt.% NaCl solution for 4 weeks. The results show that because of the potential difference between 7072 and 3004 aluminum alloys, 7072 alloy behaves more anodic and corrodes preferentially (with a slower rate) compared to 3004 aluminum alloy. Cladding 3004 with embossed 7072 alloy improves the corrosion resistance of the alloy. Moreover, the electrolyte comparison demonstrates that the carbonate-forming ions (such as Ca) in tap water and HCO3−, NO3−, and SO42− in rainwater decelerate the corrosion rate.

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A Study on the Corrosion Behavior of 7072/3004/7072 Clad Aluminum Alloy in Different Media

Abstract

Bibliographical note

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Keywords

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