Effect of high‐density current electropulsing on corrosion cracking of titanium aluminide intermetallic

• Published in: Materials and corrosion 2021-07, Vol.72 (7), p.1243-1248
• Main Authors: Babutskyi, Anatolii, Chrysanthou, Andreas, Chyzhyk, Ganna, Cortázar, Maider García, Egizabal, Pedro, Smelina, Marija
• Format: Article
• Language: English
• Subjects: Conduction electrons; Corrosion; corrosion cracking; Corrosion effects; Corrosion resistance; Density currents; electropulsing; Intermetallic compounds; Microhardness; residual stress; Sodium fluoride; Stress corrosion cracking; titanium aluminide intermetallic; Titanium aluminides; Titanium base alloys
• ISSN: 0947-5117; 1521-4176
• DOI: 10.1002/maco.202012253

The effect of electropulsing on the corrosion cracking of titanium aluminide produced by self‐propagating high‐temperature synthesis has been investigated. The electropulsing treatment led to improved corrosion resistance in sodium fluoride solution and also eliminated corrosion cracking at the α2/γ interface during corrosion in a solution of nitric and hydrofluoric acids. This behavior was attributed to thermal and athermal effects resulting from electropulsing and leading to the interaction of conduction electrons with the defect structure. The effect of magnetic field accompanying electropusling on depinning of dislocations also has been discussed. Support for this is provided on the basis of X‐ray diffraction analysis and microhardness testing. The effect of electropulsing on the corrosion cracking of titanium aluminide produced by self‐propagating high‐temperature synthesis has been investigated. The electropulsing treatment led to improved corrosion resistance in sodium fluoride solution and also eliminated corrosion cracking at the α2/γ interface during corrosion in a solution of nitric and hydrofluoric acids.