[논문]알루미늄 5052 및 6061 합금의 양극산화 표면처리를 통한 발수 특성 및 부식 특성 비교

박영주; 정찬영

doi:10.14773/cst.2022.21.3.200

알루미늄 5052 및 6061 합금의 양극산화 표면처리를 통한 발수 특성 및 부식 특성 비교
Comparison of Hydrophobicity and Corrosion Properties of Aluminum 5052 and 6061 Alloys After Anodized Surface Treatment 원문보기

Corrosion science and technology, v.21 no.3, 2022년, pp.200 - 208

Abstract ▼ AI-Helper

Aluminum alloy is used by adding various elements according to the needs of the industry. Aluminum alloys such as 5052 and 6061 are known to possess excellent corrosion resistance by adding Mg. Despite their excellent physical properties, corrosion can occur. To solve this problem, an anodization technique generally can improve corrosion resistance by forming an oxide structure with maximized hydrophobic properties through coatings. In this study, the anodizing technique was used to improve the hydrophobicity of aluminum 5052 and 6061 by creating porous nanostructures on top of the surface. An oxide film was formed by applying anodizing voltages of 20, 40, 60, 80, and 100 V to aluminum alloys followed by immersion in 0.1 M phosphoric acid for 30 minutes to expand oxide pores. Contact angle and corrosion characteristics were different according to the structure after anodization. For the 5052 aluminum, the corrosion potential was improved from -363 mV to -154 mV as the contact angle increased from 116° to 136°. For the 6061 aluminum, the corrosion potential improved from -399 mV to -124 mV when the contact angle increased from 116° to 134°.

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표/그림 (13)

그림 Fig. 1. Schematic of Anodization film formation in the study
그림 Fig. 2. EDS analysis Comparison of aluminum and oxygen contents by anodization applied voltage: (a) 5052 Aluminum, (b) 6061 Aluminum
그림 Fig. 3. FE-SEM top view image by applied voltage for anodization
표 Table 1. EDS analysis of 5052 aluminum anodization applied voltage
표 Table 2. EDS analysis of 6061 aluminum anodization applied voltage
그림 Fig. 4. FE-SEM cross view image by applied voltage for anodization
$Fig. 5. Comparison of pore size, interpore distance, anodization film thickness and solid fraction after anodization of aluminum 5052 and 6062$ 그림 Fig. 5. Comparison of pore size, interpore distance, anodization film thickness and solid fraction after anodization of aluminum 5052 and 6062
그림 Fig. 6. Contact angle images before and after coating of anodized 5052 and 6061 aluminum
$Table 3. Analysis of pore size, interpore distance, anodization film thickness and solid fraction after anodization of aluminum 5052 and 6062$ 표 Table 3. Analysis of pore size, interpore distance, anodization film thickness and solid fraction after anodization of aluminum 5052 and 6062
그림 Fig. 7. Comparison of contact angles before and after anodized 5052 and 6061 aluminum coatings
그림 Fig. 8. Potential polarization curve for each applied voltage for anodization: (a) 5052 Aluminum, (b) 6061 Aluminum
표 Table 4. Analysis of contact angle before and after anodizing 5052, 6061 aluminum coating
표 Table 5. Potential dynamic polarization test results after FDTS coating of anodized samples at different applied voltages

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