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Acetic acid – direct corrosive mediator in SCC of titanium/ethanol system
Author(s) -
Jiang Y.,
Wu Y.,
Wang K.
Publication year - 2006
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.200503941
Subject(s) - acetic acid , corrosion , ethanol , titanium , polarization (electrochemistry) , anode , titanium alloy , materials science , alcohol , metallurgy , chemistry , alloy , organic chemistry , electrode
Although so many researchers paid attention on stress corrosion mechanism of titanium/ethanol system, few papers explained why ethanol, a very weak corrosive mediator, caused severe anodic solution. We found that the anodic polarization process of the titanium/ethanol system produced lots of acetic acid, which caused the pH value decreased rapidly. Maybe the acetic acid was the direct reason of stress corrosion susceptibility of titanium alloy in ethanol. And SSR tests proved that acetic acid could accelerate SCC of this system seriously. Also we found that in this system when the specimen was in the yield region, its corrosion potential fluctuated and PDS analysis showed this fluctuation was not a pure random process but a random fluctuation superposed with a definitive quasi‐sine wave. We thought that it was acetic acid made the passive film unstable and this unstable state was the main reason caused SCC in this system.