Crevice Corrosion of Grade-12 Titanium / X. He, J. J. No¿̐ưl, D. W. Shoesmith
- Conference Author:
- Advances in Electrochemical Techniques for Corrosion Monitoring and Measurement (2007 : Norfolk, VA)
- Physical Description:
- 1 online resource (19 pages) : illustrations, figures, tables
- Additional Creators:
- Shoesmith, D. W., He, X., No¿̐ưl, J. J., American Society for Testing and Materials, and ASTM International
- Restrictions on Access:
- Subscription required for access to full text. and License restrictions may limit access.
- The crevice corrosion of ASTM grade-12 titanium (Ti-12; 0.8 wt % Ni, 0.3 wt % Mo) has been studied in neutral 0.27 mol/L NaCl at temperatures up to 120¿̐ưC using a galvanic coupling technique. The results were compared to those of similar experiments conducted on ASTM grade-2 titanium (Ti-2) specimens containing various amounts of iron impurity. The microstructural properties of the Ti-12 were determined by standard metallographic techniques and transmission electron microscopy. Penetration depth profiles were determined using metallographic and image analysis techniques. The redistribution of alloying elements (Ni, Mo) and impurities (Fe), and the location of absorbed hydrogen, were determined by secondary ion mass spectrometry (SIMS) imaging. The rate and extent of crevice propagation were significantly suppressed on Ti-12 compared to Ti-2, especially at higher temperature (120¿̐ưC). Up to 97 % of the total amount of crevice propagation was driven by proton reduction inside the creviced area rather than by oxygen reduction outside the crevice. SIMS imaging shows that Ni accumulates on the corroding surface, probably in the form of residual Ti2Ni particles. Proton reduction is catalyzed on these particles, leading to their hydriding and an increase in the relative area of internal cathodes compared to available anodic surface area. This self-induced ¿̐ưcathodic modification¿̐ư effect leads to repassivation of the corroded site before extensive damage can be sustained.
- Dates of Publication and/or Sequential Designation:
- Volume 2009, Issue 1506 (January 2009)
- 9780803169975 (e-ISBN) and 9780803155220
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 31.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., Full text article also available for purchase., and Also available in PDF edition.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2009. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
View MARC record | catkey: 28006816