| Title |
Time-Dependent Changes in Electrochemical Surface Resistance and Localised Corrosion Behaviour of UNS A93003 in a Saline Solution |
| Authors |
서지원(Jiwon Seo) ; 주헝지애(Hengjie Zhu) ; 이윤화(Yoon-Hwa Lee) ; 정호석(Hoseok Jung) ; 김정구(Jung-Gu Kim) ; 이준섭(Jun-Seob Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2025.63.10.757 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
UNS A93003; Localised corrosion; Immersion; EIS; Chloride ion |
| Abstract |
This study investigated the localised corrosion behaviour of UNS A93003 alloy in a chloride
environment, employing potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), and
surface analysis techniques. Potentiodynamic polarisation results indicated that, as the chloride concentration
increased, the alloy surface exhibited higher anodic current densities at the same overpotential, suggesting
an accelerated rate of localised corrosion. During the initial immersion period, electrochemical reactions on
the alloy surface were dominated by protective mechanisms such as passivation and re-passivation, resulting
in an increase in surface resistance. However, as immersion time progressed, localised corrosion became the
dominant process, leading to a significant reduction in surface resistance. With prolonged exposure, extensive
localised corrosion was observed with corrosion products such as aluminium oxide and hydroxide
accumulating around the affected areas. These corrosion products acted as intermediaries that promoted
further electrochemical reactions, potentially accelerating the propagation of localised corrosion. These
findings confirm that the corrosion behaviour of the UNS A93003 alloy surface evolved dynamically over time,
highlighting its susceptibility to localised corrosion in chloride environments. The results provide essential
insights that could support efforts to enhance alloy durability and effective corrosion prevention strategies for
industrial applications. |