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Passive Oxide Films and Their Susceptibility to Corrosion

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (15 February 2017) | Viewed by 4633

Special Issue Editor


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Guest Editor
Department of Materials Science & Engineering, National University of Singapore, Singapore 117574, Singapore
Interests: aqueous corrosion; semiconductor electrochemistry; electrochromic windows

Special Issue Information

Dear Colleagues,

It is only the presence of passive oxide films that allows us to make use a number of thermodynamically reactive metals, such as aluminium and titanium alloys, as well as stainless steels. Despite the obvious economic importance of these thin films and decades of study, we are only now starting to really understand their properties; be it crystallinity, electrical conductivity or even in some cases composition. This knew knowledge should lead us to a better understanding of, or, perhaps, to a better agreement on, the mechanisms behind the breakdown of passive films and the subsequent corrosion of the underlying substrate.

The scope of this Special Issue covers, but is not limited to: The nature of passive films on industrially important metals and alloys and their role in preventing corrosion and degradation.

Prof. Dr. Daniel J. Blackwood
Guest Editor

Manuscript Submission Information

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Keywords

  • Passivity
  • Corrosion
  • Metals and alloys

Published Papers (1 paper)

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Research

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Article
Fretting Corrosion Behavior of Experimental Ti-20Cr Compared to Titanium
by Tomofumi Sawada, Christine Schille, Atif Almadani and Jürgen Geis-Gerstorfer
Materials 2017, 10(2), 194; https://doi.org/10.3390/ma10020194 - 17 Feb 2017
Cited by 12 | Viewed by 4118
Abstract
Experimental cast titanium alloys containing 20 mass% chromium (Ti-20Cr) show preferable mechanical properties and a good corrosion resistance. This study evaluated the fretting corrosion behavior of Ti-20Cr. Ti-20Cr (n = 4) and commercially pure titanium (CP-Ti, n = 6) disk specimens were [...] Read more.
Experimental cast titanium alloys containing 20 mass% chromium (Ti-20Cr) show preferable mechanical properties and a good corrosion resistance. This study evaluated the fretting corrosion behavior of Ti-20Cr. Ti-20Cr (n = 4) and commercially pure titanium (CP-Ti, n = 6) disk specimens were used. The fretting corrosion test was performed by electrochemical corrosion at 0.3 V in 0.9% saline solution and mechanical damage using 10 scratching cycles with three different scratching speeds (10–40 mm/s) at 10 N. After testing, the activation peak, repassivation time and surface morphology of each specimen were analyzed. The differences between the results were tested by parametric tests (α = 0.05). The average activation peaks were significantly higher in CP-Ti than in Ti-20Cr (p < 0.01), except at 20 mm/s. In the series of scratching speeds, faster scratching speeds showed higher activation peaks. The maximum activation peaks were also higher in CP-Ti. Slight differences in the repassivation time were observed between the materials at every scratching speed; faster scratching speeds showed shorter repassivation times in both materials (p < 0.05). CP-Ti showed severe damage and significantly higher wear depth than Ti-20Cr (p < 0.05). In conclusion, adding chromium to titanium reduced surface damage and improved the fretting corrosion resistance. Full article
(This article belongs to the Special Issue Passive Oxide Films and Their Susceptibility to Corrosion)
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