Influence of commercial copper micro structure on the artificial green patina formation processes

ROSA DE LAS MERCEDES VERA ARAVENA, J. Pulgar, A. Olguín

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Commercial copper was submitted to a thermomechanical treatment in order to study its influence on the velocity of artificial green patina formation by immersion as well as on the thickness and adherence of the corrosion product formed on the underlying metal. The thermomechanical treatment enabled us to obtain samples with 9 to 60 μm grain size. These samples were submitted to an accelerated attack by immersion in an electrolytic bath in order to obtain a green patina. On the smallest grain size material it can be observed a patina with high thickness and adherence, smooth texture and homogeneous morphology. From the electrochemical assays it was established that the passivity current decreases for decreasing grain sizes. These results are consistent with the minimal porosity presented by the patina morphology which increase the protecting power. The underlying material did not present localized attack.

Original languageEnglish
Pages (from-to)370-375
Number of pages6
JournalRevista de Metalurgia (Madrid)
Volume33
Issue number6
DOIs
StatePublished - 1997
Externally publishedYes

Keywords

  • Atmospheric corrosion
  • Copper
  • Grain size
  • Patina

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