Publicado

2015-03-01

The influence of the glycerin concentration on the porous structure of ferritic stainless steel obtained by anodization

DOI:

https://doi.org/10.15446/dyna.v82n190.42638

Palabras clave:


Anodizing, ferritic stainless steel, glycerin, porous structure. (es)

Autores/as

  • Alexander Bervian Universidade Federal do Rio Grande do Sul
  • Gustavo Alberto Ludwig Universidade Federal do Rio Grande do Sul
  • Sandra Raquel Kunst Universidade Federal do Rio Grande do Sul
  • Lílian Vanessa Rossa Beltrami Universidade Federal do Rio Grande do Sul
  • Angela Beatrice Dewes Moura Universidade Feevale
  • Célia Fraga Malfatti Universidade Federal do Rio Grande do Sul
  • Cláudia Trindade Oliveira Universidade Feevale
Anodizing of ferritic stainless steel has been used for decoration purposes to obtain a barrier effect. The most commonly used electrolyte for this process is INCO (5M H2SO4 + 2,5M CrO3). INCO electrolyte with glycerin addition induces the formation of ordered porous structures, because glycerin reduces the electrolyte conductivity. Ferritic stainless steel was anodized in electrolyte composed by 2M H2SO4 with glycerin addition in different concentrations, without chromium oxide addition. It was observed that the addition of 90 v/v% glycerin promoted a reduction in the electrolyte conductivity, which caused an increase in the anodizing potential. The glycerin addition to the electrolyte diminished the oxide dissolution in the electrolytic solution, promoting the formation of an oxide with an ordered porous structure.

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