Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Mechanism According to Localized Damage of Zn-Al-Mg Alloy Coated Steel Sheet Used in Plant Farm

플랜트팜용 3원계 (Zn-Al-Mg) 합금도금 강판의 국부손상에 따른 부식 메커니즘

  • Jin Sung Park (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Jae Won Lee (POMIA (Pohang Institute of Metal Industry Advancement)) ;
  • Sung Jin Kim (Department of Advanced Materials Science and Engineering, Sunchon National University)
  • 박진성 (순천대학교 첨단신소재공학과) ;
  • 이재원 (포항금속소재산업진흥원) ;
  • 김성진 (순천대학교 첨단신소재공학과)
  • Received : 2023.04.17
  • Accepted : 2023.04.21
  • Published : 2023.04.30
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Abstract

This study aimed to evaluate corrosion resistance of steel coated with GI and Zn-Al-Mg alloy using cyclic corrosion test (CCT) with electrochemical polarization and impedance measurements. Results showed that the Zn-Al-Mg alloy coated steel had a much higher corrosion rate than GI coated steel in early stages of corrosion. With prolonged immersion, however, the corrosion rate of the Zn-Al-Mg alloy coated steel greatly decreased, mainly owing to a significant decrease in the cathodic reduction reaction and an increase in polarization resistance at the surface. This was closely associated with the formation of protective corrosion products including Zn5(OH)8Cl2·H2O and Zn6Al2(OH)16CO3. Moreover, when the steel substrate was locally exposed due to mechanical damage, the kinetics of anodic dissolution from the coating layer and the formation of protective corrosion products on the surface of the Zn-Al-Mg alloy coated steel became much faster compared to the case of GI coated steel. This could provide a longer-lasting corrosion inhibition function for Zn-Al-Mg alloy coated steel used in plant farms.

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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