Study on Corrosion Process of Al-Mg Coatings Based on Electrochemical Impedance Spectroscopy

Hui Tong; Wen Li Han; Zhong Ping Xu; Yan Jun Zhang; Zhu Lin; Shi Cheng Wei

doi:10.4028/www.scientific.net/KEM.744.380

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 744Study on Corrosion Process of Al-Mg Coatings Based...

Study on Corrosion Process of Al-Mg Coatings Based on Electrochemical Impedance Spectroscopy

Abstract:

Electrochemical impedance spectroscopy (EIS) is a technology of nondestructive electrochemical testing. In this paper, EIS is applied to study the corrosion processes of Al-Mg coatings. In the initial 24 h of immersion in 3.5% NaCl solution, passive films of Al-Mg coatings dissolve quickly. As time passed, corrosion products increase on surface gradually, which can inhibit corrosion. After 480h of immersion, corrosion products fully cover on Al-Mg coatings’ surface. The EIS of different corrosion processes are fitted by three equivalent circuits corresponding to the three corrosion processes. In the test of open circuit potentials (OCP), OCP is instable in the initial 24 h of immersion. As immersion time goes by, OCP tends to stabilization at about -0.90 V. Measurements of scanning electron microscope (SEM) confirm the conclusions of electrochemical measurements.

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Periodical:

Key Engineering Materials (Volume 744)

Pages:

380-384

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.744.380

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Online since:

July 2017

Authors:

Hui Tong*, Wen Li Han, Zhong Ping Xu, Yan Jun Zhang, Zhu Lin, Shi Cheng Wei

Keywords:

Al-Mg Coatings, Electrochemical Impedance Spectroscopy, High Velocity Arc Spraying, Open Circuit Potential, SEM Measurements

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