Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
권호 표지
DOI QR코드

DOI QR Code

Anodic Oxidation Treatment Methods of Metals

금속의 양극산화처리 기술

  • Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science)
  • 문성모 (재료연구소 표면기술연구본부 전기화학 연구실)
  • Received : 2018.02.23
  • Accepted : 2018.02.26
  • Published : 2018.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

Anodic oxidation treatment of metals is one of typical surface finishing methods which has been used for improving surface appearance, bioactivity, adhesion with paints and the resistances to corrosion and/or abrasion. This article provides fundamental principle, type and characteristics of the anodic oxidation treatment methods, including anodizing method and plasma electrolytic oxidation (PEO) method. The anodic oxidation can form thick oxide films on the metal surface by electrochemical reactions under the application of electric current and voltage between the working electrode and auxiliary electrode. The anodic oxide films are classified into two types of barrier type and porous type. The porous anodic oxide films include a porous anodizing film containing regular pores, nanotubes and PEO films containing irregular pores with different sizes and shapes. Thickness and defect density of the anodic oxide films are important factors which affect the corrosion resistance of metals. The anodic oxide film thickness is limited by how fast ions can migrate through the anodic oxide film. Defect density in the anodic oxide film is dependent upon alloying elements and second-phase particles in the alloys. In this article, the principle and mechanisms of formation and growth of anodic oxide films on metals are described.

Keywords

References

  1. P.G. Sheasby, B.A. Scott, Corrosion, third Ed, Elsevier (1994) 15:3.
  2. G.E. Thompson, G.C. Wood, Treatise on Materials Science and Technology, Academic Press (1983) 205.
  3. V. F. Henley, Anodic Oxidation of Aluminium and its Alloys, Elsevier (1982)
  4. A.L. Yerokhin, X. Nie, A. Leyland, A. Matthews, S.J. Dowey, Plasma electrolysis for surface engineering, Surface and Coatings Technology 122 (1999) 73-93. https://doi.org/10.1016/S0257-8972(99)00441-7
  5. E. Matykina, R. Arrabal, A. Mohamed, P. Skeldon, G.E. Thompson, Plasma electrolytic oxidation of pre-anodized aluminium, Corrosion Science 51 (2009) 2897-2905. https://doi.org/10.1016/j.corsci.2009.08.004
  6. S. Moon, Y. Jeong, Generation mechanism of microdischarges during plasma electrolytic oxidation of Al in aqueous solutions, Corrosion Science 51 (2009) 1506-1512. https://doi.org/10.1016/j.corsci.2008.10.039
  7. S. Moon, C. Yang, S. Na, Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy, Kor. Inst. Surf. Eng. 47(2014) 147-154. https://doi.org/10.5695/JKISE.2014.47.4.147
  8. D. Kwon, S. Moon, Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in $ PO_4^{3-}$ and $SiO_3^{2-}$ Containing Aqueous Solution, Kor. Inst. Surf. Eng. 49 (2016) 46-53. https://doi.org/10.5695/JKISE.2016.49.1.46
  9. S. Moon, D. Kwon, Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations, Kor. Inst. Surf. Eng. 49 (2016) 225-230. https://doi.org/10.5695/JKISE.2016.49.3.225
  10. S. Moon, Duyoung Kwon, Anodic oxidation behavior of AZ31 magnesium alloy in aqueous electrolyte containing various $Na_2CO_3$ concentrations, Kor. Inst. Surf. Eng. 49 (2016) 331-338. https://doi.org/10.5695/JKISE.2016.49.4.331
  11. X. Lu, M. Mohedano, C. Blawert, E. Matykina, R. Arrabal, K. U. Kainer, M. L. Zheludkevich, Plasma electrolytic oxidation coatings with particle additions - A review, Surface and Coatings Technology 307 (2016) 1165-1182. https://doi.org/10.1016/j.surfcoat.2016.08.055
  12. Jung-Hyung Lee, Seong-Jong Kim, Influences of Potassium Fluoride (KF) Addition on the Surface Characteristics in Plasma Electrolytic Oxidation of Marine Grade Al Alloy, Kor. Inst. Surf. Eng. 49 (2016) 280-285. https://doi.org/10.5695/JKISE.2016.49.3.280
  13. Jung-Hyung Lee, Seong-Jong Kim, Characterization of Ceramic Oxide Layer Produced on Commercial Al Alloy by Plasma Electrolytic Oxidation in Various KOH Concentrations, Kor. Inst. Surf. Eng. 49 (2016) 119-124. https://doi.org/10.5695/JKISE.2016.49.2.119
  14. S. Moon, C. Yang, S. Na, Formation Behavior of Anodic Oxide Films on Al7075 Alloy in Sulfuric Acid Solution, Kor. Inst. Surf. Eng. 47 (2014) 155-161. https://doi.org/10.5695/JKISE.2014.47.4.155