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Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn–Al coating

Xiaoxiao Liu (Changzhou University – Wujin Campus, Changzhou, China)
Dejun Kong (Changzhou University, Changzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 9 August 2019

Issue publication date: 22 August 2019

Abstract

Purpose

This study aims to investigate the salt spray corrosion (SSC) and electrochemical corrosion of obtained Zn–Al coating, which provided a basis for comprehensive analysis of corrosion behavior of Zn–Al coating.

Design/methodology/approach

A Zn–Al coating was fabricated on Q235A steel using a Dacromet method. The SSC and electrochemical corrosion performances in 3.5 Wt.% NaCl solution were investigated using an SSC chamber and electrochemical workstation, respectively, and the corrosion mechanism of Zn–Al coating was discussed.

Findings

The Dacromet fabricated Zn–Al coating is primarily composed of Zn and Al phases, its residual stress of −11.1 ± 4 MPa is compressive stress, which is beneficial to improve its corrosion resistance. In the SSC process, the corrosion product of Zn5(OH)8Cl2H2O enhances the corrosion resistance of Zn–Al coating, which provides sufficient cathodic protection for the substrate. The corrosion potential of Zn–Al coating is lower than that of substrate, which provides sufficient cathodic protection to the substrate, the Zn–Al coating in the immersion periods is protected by the corrosion product and Zn–Al sheets.

Originality/value

In this study, a Zn–Al coating was first fabricated on Q235A steel using a Dacromet method.

Keywords

Citation

Liu, X. and Kong, D. (2019), "Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn–Al coating", Anti-Corrosion Methods and Materials, Vol. 66 No. 5, pp. 565-572. https://doi.org/10.1108/ACMM-03-2019-2100

Publisher

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Emerald Publishing Limited

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