[논문]알루미늄 열용사 코팅된 AA5083-H321의 내식성 평가

박일초; 김성준; 한민수

doi:10.14773/cst.2023.22.2.108

알루미늄 열용사 코팅된 AA5083-H321의 내식성 평가
Corrosion Resistance Evaluation of Aluminum Thermal Spray Coated AA5083-H321 원문보기

Corrosion science and technology, v.22 no.2, 2023년, pp.108 - 114

박일초 (목포해양대학교 승선실습과정부) , 김성준 ((주)와이피오) , 한민수 (목포해양대학교 기관시스템공학부)

Abstract ▼ AI-Helper

In this study, anti-corrosion effect was investigated through various electrochemical experiments after applying Al thermal spraying technology to AA5083-H321. Open circuit potential and anodic polarization curves were analyzed through electrochemical experiments in natural seawater. The shape of the surface was observed using a scanning electron microscope (SEM) and a 3D microscope before and after the experiment. Component and crystal structure were analyzed through EDS and XRD. As a result, the surface roughness of AA5083-H321 and the Al thermal sprayed coating layer increased due to surface damage caused by anodic dissolution reaction during the anodic polarization experiment. The corrosion rate of AA5083-H321 was relatively low because the Al thermal spray coating layer contained structural defects such as pores and crevices. Nevertheless, the open circuit potential of the Al thermal spray coating layer in natural seawater was measured about 0.2 V lower than that of AA5083-H321. Thus, a sacrificial anode protection effect can be expected.

주제어

표/그림 (9)

그림 Fig. 1. The case of local corrosion damage of aluminum alloy in marine environment
그림 Fig. 2. Surface analysis of AA5083-H321(a and b) and Al thermal spray coating layer(c and d) by SEM and 3D microscopy
그림 Fig. 3. Mapping images of the cross-section of the Al thermally sprayed coating layer through EDS analysis
그림 Fig. 4. XRD pattern of AA5083-H321 and Al thermal spray coating layer
그림 Fig. 5. Open circuit potential(OCP) of AA5083-H321 and Al thermal spray coating layer in natural seawater
표 Table 1. EDS component analysis results (wt%) of the Al thermal spray coating layer (#1 and #2 positions in Fig. 3 (a))
그림 Fig. 6. Potentiodynamic polarization curves of AA5083- H321 and Al thermal spray coating layer in natural seawater
그림 Fig. 7. Surface damage observation of AA5083-H321(a and b) and Al thermal spray coating layer(c and d) through SEM and 3D microscope after potentiodynamic polarization experiment
그림 Fig. 8. Polarization curves and Tafel extrapolation results of AA5083-H321 and Al thermal spray coating layer in natural seawater

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