해양 구조물용 고장력강의 해수 내 정전위방식실험에 따른 전기화학적 거동 및 표면특성 연구
Investigation on Electrochemical Behavior and Surface Characteristics of High-Strength Steel for Marine Structures Under Potentiostatic Protection Experiment in Seawater
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High-strength steel used in marine structures is consistently subjected to harsh environments, influenced by factors such as salinity and flow velocity in seawater. To solve corrosion, impressed current cathodic pro- tection systems are employed. This investigation compares and analyzes the electrochemical behavior and surface characteristics of AH32 high-strength steel under various corrosion protection conditions in a sea- water environment. To achieve this, cathodic polarization and potentiostatic polarization experiments were conducted to assess the effects of applied potential on corrosion characteristics and surface conditions. When a potential between -0.80 V and -0.95 V (vs. Ag/AgCl, 3.3 M KCl) was applied, low current density is observed. In addition, concentration polarizationby reduction reaction occurred without any observed surface damage. Thus, this potential range was determined to be an excellent protection condition. Con- versely, at an applied potential of -1.1 V or lower, surface roughness increased significantly due to surface damage from excessive hydrogen generation. Notably, numerous interparticle peelings and microcracks were detected between -1.2 V and -1.3 V.
Abstract
High-strength steel used in marine structures is consistently subjected to harsh environments, influenced by factors such as salinity and flow velocity in seawater. To solve corrosion, impressed current cathodic pro- tection systems are employed. This investigation compares and analyzes the electrochemical behavior and surface characteristics of AH32 high-strength steel under various corrosion protection conditions in a sea- water environment. To achieve this, cathodic polarization and potentiostatic polarization experiments were conducted to assess the effects of applied potential on corrosion characteristics and surface conditions. When a potential between -0.80 V and -0.95 V (vs. Ag/AgCl, 3.3 M KCl) was applied, low current density is observed. In addition, concentration polarizationby reduction reaction occurred without any observed surface damage. Thus, this potential range was determined to be an excellent protection condition. Con- versely, at an applied potential of -1.1 V or lower, surface roughness increased significantly due to surface damage from excessive hydrogen generation. Notably, numerous interparticle peelings and microcracks were detected between -1.2 V and -1.3 V.