Effect of Fe- and Si-enriched secondary precipitates and surface roughness on pore formation on aluminum plate surfaces during anodizing

Yuanzhi Zhu, Shizhi Wang, Qingda Yang, Feng Zhou

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Two twin roll casts (TRCs) and one hot rolled (HR) AA 1235 aluminum alloy plates with different microstructures are prepared. The plates were electrolyzed in a 1.2 wt% HCl solution with a voltage of 21 V and a current of 1.9 mA. The shape, size, and number of pores formed on the surfaces of these plates were analyzed and correlated with the microstructures of the plates. It is found that pores are easier to form on the alloy plates containing subgrains with a lower dislocation density inside the subgrains, rather than along the grain boundaries. Furthermore, Fe- and Si-enriched particles in the AA1235 aluminum alloys lead to the formation of pores on the surface during electrolyzing; the average precipitate sizes of 4, 3.5, and 2 μm in Alloy 1#, Alloy 2# and Alloy 3# result in the average pore sizes of 3.78, 2.76, and 1.9 μm on the surfaces of the three alloys, respectively; The G.P zone in the alloy also facilitates the surface pore formation. High-surface roughness enhances the possibility of entrapping more lubricants into the plate surface, which eventually blocks the formation of the pores on the surface of the aluminum plates in the following electrolyzing process.

Original languageEnglish
Pages (from-to)3389-3399
Number of pages11
JournalJournal of Materials Engineering and Performance
Volume23
Issue number9
DOIs
StatePublished - 2014

Fingerprint

Anodic oxidation
Aluminum
Precipitates
Surface roughness
Aluminum alloys
Microstructure
Pore size
Lubricants
Grain boundaries
Electric potential

Keywords

  • aluminum alloys
  • electrolyzing
  • pore size
  • twin roller casting

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effect of Fe- and Si-enriched secondary precipitates and surface roughness on pore formation on aluminum plate surfaces during anodizing. / Zhu, Yuanzhi; Wang, Shizhi; Yang, Qingda; Zhou, Feng.

In: Journal of Materials Engineering and Performance, Vol. 23, No. 9, 2014, p. 3389-3399.

Research output: Contribution to journalArticle

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