ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this study, a current density contour map of TiNi shape memory alloy in sodiumsulfate solutions was constructed by potentiodynamic polarization technique. The current densitycontour map of TiNi alloy, constructed in a 0.5 M sodium sulfate solution over the pH range 1 to 13at 37oC, showed only hydrogen evolution region, passive region, and oxygen evolution region. Thelocalized corrosion region did not exist and the susceptibility of localized corrosion was notexhibited. We also investigated the effects of chloride ions on the pitting corrosion of TiNi alloy insodium sulfate solutions. Pitting corrosion occurred with addition of 0.2 M NaCl in a sulfatesolution. And it was observed that pitting potential got lower as the concentration of chloride ionwent up. However, repassivation potential was not affected by the addition of chloride ion up to 0.5M. It is concluded that a TiNi shape memory alloy exists as a passive state and a good corrosionresistance in sulfate solutions over the pH range 1 to 13, and the sulfate ion performs a role ofinhibiting localized corrosion in chloride environment
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.569.pdf
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