Study of the role of aluminium and corrosion mechanism in galvalume coating in the marine atmospheric environment

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials Pub Date : 2024-02-21 DOI:10.1108/acmm-08-2023-2889

Shuliu Wang, Qianqian Liu, Jin Wang, Nana Chen, JunHang Chen, Jialiang Song, Xin Zhang, Kui Xiao

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引用次数: 0

Abstract

Purpose

This study aims to investigate the role of aluminium (Al) in marine environment and the corrosion mechanism of galvalume coatings by conducting accelerated experiments and data analysis.

Design/methodology/approach

Samples were subjected to accelerated corrosion for 136 days via salt spray tests to simulate the natural conditions of marine environment and consequently accelerate the experiments. Subsequently, the samples were examined using various test methods, such as EDS, scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS), and the obtained data were analysed.

Findings

Galvalume coatings comprised interdigitated zinc (Zn)-rich and dendritic Al-rich phases. Corrosion was observed to begin with a Zn-rich phase. The primary components of the corrosion product film were Al₂O₃ and Zn₅(OH)₈Cl₂·H₂O. It was confirmed that the role of Al was to form a dense protective film, thereby successfully blocking the entry of corrosive media and protecting the iron substrate.

Originality/value

This study provides a clearer understanding of the corrosion mechanism and kinetics of galvalume coatings in a simulated marine environment. In addition, the role of Al, which is rarely mentioned in the literature, was investigated.

查看原文本刊更多论文

研究铝在海洋大气环境中的作用以及镀锌层的腐蚀机理

本研究旨在通过加速实验和数据分析，研究铝（Al）在海洋环境中的作用以及镀锌层的腐蚀机理。设计/方法/方法通过盐雾试验对样品进行 136 天的加速腐蚀，以模拟海洋环境的自然条件，从而加速实验。随后，使用 EDS、扫描电子显微镜 (SEM)、X 射线衍射 (XRD) 和电化学阻抗光谱 (EIS) 等各种测试方法对样品进行了检测，并对获得的数据进行了分析。据观察，腐蚀始于富锌相。腐蚀产物膜的主要成分是 Al2O3 和 Zn5(OH)8Cl2-H2O。研究证实，Al 的作用是形成一层致密的保护膜，从而成功地阻止腐蚀介质的进入并保护铁基材。此外，还研究了文献中很少提及的铝的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.