알루미늄 열용사 코팅된 AA5083-H321의 내식성 평가
Corrosion Resistance Evaluation of Aluminum Thermal Spray Coated AA5083-H321
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In this study, anti-corrosion effect was investigated through various electrochemical experiments afterapplying Al thermal spraying technology to AA5083-H321. Open circuit potential and anodic polarizationcurves were analyzed through electrochemical experiments in natural seawater. The shape of the surfacewas observed using a scanning electron microscope (SEM) and a 3D microscope before and after theexperiment. Component and crystal structure were analyzed through EDS and XRD. As a result, the surfaceroughness of AA5083-H321 and the Al thermal sprayed coating layer increased due to surface damagecaused by anodic dissolution reaction during the anodic polarization experiment. The corrosion rate ofAA5083-H321 was relatively low because the Al thermal spray coating layer contained structural defectssuch as pores and crevices. Nevertheless, the open circuit potential of the Al thermal spray coating layer innatural seawater was measured about 0.2 V lower than that of AA5083-H321. Thus, a sacrificial anodeprotection effect can be expected.
Abstract
In this study, anti-corrosion effect was investigated through various electrochemical experiments afterapplying Al thermal spraying technology to AA5083-H321. Open circuit potential and anodic polarizationcurves were analyzed through electrochemical experiments in natural seawater. The shape of the surfacewas observed using a scanning electron microscope (SEM) and a 3D microscope before and after theexperiment. Component and crystal structure were analyzed through EDS and XRD. As a result, the surfaceroughness of AA5083-H321 and the Al thermal sprayed coating layer increased due to surface damagecaused by anodic dissolution reaction during the anodic polarization experiment. The corrosion rate ofAA5083-H321 was relatively low because the Al thermal spray coating layer contained structural defectssuch as pores and crevices. Nevertheless, the open circuit potential of the Al thermal spray coating layer innatural seawater was measured about 0.2 V lower than that of AA5083-H321. Thus, a sacrificial anodeprotection effect can be expected.
참고문헌 (20)
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