2005 Volume 54 Issue 9 Pages 431-439
In MgCl2 solutions containing silicate ions, the susceptibility to stress corrosion cracking (SCC) for austenite stainless steel has been investigated by means of electrochemical polarization measurements, impedance measurements, slow strain rate tensile tests (SSRT), and ion transport measurements. It was found that the SCC susceptibility of austenite stainless steel was reduced by adding Mg2Si3O8 in MgCl2 solutions, and that this is due to the suppression of oxygen reduction reaction by the pH buffering effect of undissolved Mg2Si3O8. Membranes fabricated by pressing Mg2Si3O8 particles showed weak selective anion transport properties, suggesting that Mg2Si3O8 film formed during long immersion period suppresses the penetration of chloride ions to the specimen surface.
