Evaluation of the Electrochemical Behavior in Acid Media of HVOF-Spray Alloy Coatings

Tuesday, 7 October 2014: 15:15
Expo Center, 1st Floor, Universal 15 (Moon Palace Resort)
J. A. Cabral Miramontes Sr., J. Y. Achem Calahorra, A. Trujillo Estrada (Universidad Autónoma de Nuevo León (UANL), Facultad de Ingeniería Mecánica y Eléctrica (FIME),), G. Pedraza Basulto (Centro de Investigación en Materiales Avanzados, Departamento de Integridad Estructural y Materiales Compuestos, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chih., México.), C. Poblano Salas (Centro de Tecnología Avanzada (CIATEQ, A.C.), Procesos de Manufactura), and F. Almeraya Calderon (Universidad Autónoma de Nuevo León (UANL), Facultad de Ingeniería Mecánica y Eléctrica (FIME),)
In the aircraft and aerospace industry, coatings obtained by thermal spraying HVOF are use in some components of steam turbines, due to the passage of gases at high temperatures cause of the rotation of the wing which is subjected to severe static and dynamic load, usually associated with microstructure degradation mechanisms as corrosion, wear and creep. The MCrAlY coating ( M = Co or Ni ) type applications are used to provide wear and also corrosion resistance. In this work a HVOF gun was used to prepare a MCrAlY coating which has been subjected to two electrochemical techniques: polarization resistance and cyclic polarization curves in order to obtain the behavior of the rate of corrosion in acid and neutral media. The results show that the acid factor in the solution play an important role in the corrosion resistance of MCrAlY coating applied by HVOF thermal spraying.