Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Comparison of Hydrophobicity and Corrosion Properties of Aluminum 5052 and 6061 Alloys After Anodized Surface Treatment

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

  • Park, Youngju (Department of Advanced Materials Engineering, Dong-eui University) ;
  • Jeong, Chanyoung (Department of Advanced Materials Engineering, Dong-eui University)
  • 박영주 (동의대학교신소재공학과) ;
  • 정찬영 (동의대학교신소재공학과)
  • Received : 2022.05.29
  • Accepted : 2022.06.15
  • Published : 2022.06.30
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Abstract

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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