Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Behavior of Zn-Al-Mg Alloy Coated Steel Exposed to Residential Water

일상 생활용수 내 Zn-Al-Mg계 합금도금강재의 부식거동

  • Jae Won Lee (Pohang Institute of Metal Industry Advancement (POMIA)) ;
  • Sung Jin Kim (Department of Advanced Materials Science and Engineering, Sunchon National University)
  • 이재원 (포항금속소재산업진흥원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2023.07.18
  • Accepted : 2023.07.29
  • Published : 2023.10.30
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Abstract

The objective of this study was to evaluate corrosion resistance of Zn-Al-Mg alloy coated steel in residential water with trace quantities of Cl-. Comparative evaluations were performed using two commercial coated steel products, GI and Galvalume, as reference samples. Examination of corrosion morphology and measurement of weight loss revealed that the Zn-Al-Mg alloy coated steel exhibited higher corrosion resistance than reference samples. This finding suggests that the alloy coated steel possesses long-term corrosion resistance not only in highly Cl- concentrated environments such as seawater, but also in environments with extremely low levels of Cl- found in residential water. The primary factor contributing to the superior corrosion resistance of the Zn-Al-Mg alloy coated steel in residential water is the formation of an inhibiting corrosion product composed primarily of two phases: Zn5(OH)6(CO3)2 and Zn5(OH)8Cl2·H2O. The preferential dissolution of Mg from the corroded coating layer can increase alkalinity, which might enhance the thermodynamical stability of Zn5(OH)6(CO3)2.

Keywords

Acknowledgement

This work was supported by the Technology Innovation Program (20015158, Development of processing and fastening technology to minimize damage to the plating layer of highly corrosion-resistant, highly-formed plated steel materials for plant farms.) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). In addition, this research was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C4001255).

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