Effects of biological factors on the repassivation current of titanium

Takao Hanawa, Yuko Kohayama, Sachiko Hiromoto, Akiko Yamamoto

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The repassivation current of titanium was measured by a newly designed electrochemical cell that can bare a new metal surface momentarily for the determination of the effects of biological factors such as dissolved oxygen, inorganic ions, amino acids, and proteins, on time transient of repassivation current. For this purpose, saline with various concentrations of dissolved oxygen and Hanks' solution with and without amino acids and proteins were employed as electrolytes. Estimated peak current densities and total charges during repassivation were used for the evaluation of reppasivation current. As a result, dissolved oxygen did not influence the repassivation reaction of titanium. Inorganic ions and proteins accelerated the repassivation, while some amino acids delayed it. If these factors are combined, it is important to reveal which factor governs the reaction. Unfortunately, that problem could not be revealed by this study. The above findings may apply to the dissolution amount of metal ion from depassivated titanium in the human body.

Original languageEnglish
Pages (from-to)1635-1639
Number of pages5
JournalMaterials Transactions
Volume45
Issue number5
DOIs
Publication statusPublished - 2004 May
Externally publishedYes

Keywords

  • Biomolecules
  • Chronoamperometry
  • Repassivation
  • Titanium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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