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Corrosion resistance enhancement of chemically oxidized titanium through NaOH and H 2 O 2 exposure
Author(s) -
Prando Davide,
Nicolis Davide,
Bolzoni Fabio,
Pedeferri MariaPia,
Ormellese Marco
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810543
Subject(s) - corrosion , materials science , titanium , anodizing , oxide , immersion (mathematics) , metallurgy , metal , electrochemistry , layer (electronics) , titanium oxide , chemical engineering , composite material , chemistry , electrode , aluminium , mathematics , pure mathematics , engineering
Titanium owes its astounding corrosion resistance to a thin, compact oxide layer that is formed spontaneously when the metal is exposed to the environment. However, even titanium can be subject to corrosion in very aggressive environments. To enhance its corrosion resistance, it is possible to exploit the same mechanism that leads to the formation of the protective oxide layer and force its growth with an external contribution. Oxidation can be easily stimulated with the use of an electrochemical cell. However, when part geometry or dimensions do not allow the immersion in an anodizing bath, chemical oxidation can be used. This study compares corrosion resistance enhancement after NaOH and H 2 O 2 treatment. Treatment duration and temperature, solution concentration, and quantity are optimized to achieve the best corrosion resistance with the least time and chemicals consumption, by maintaining the process easy to perform and safe for the operator.