Effects of the Heat Treatments on the Corrosion Rate of Ni-base Alloy Coatings Applied by Thermal Spray

Thursday, May 14, 2015: 10:30 AM
Room 102A (Long Beach Convention and Entertainment Center)
Dr. José Cabral , Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Mexico
Mrs. Jamnie Achem , Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Mexico
Dr. Facundo Almeraya , Universidad Autonoma de Nuevo Leon, Apocada, Nuevo León, Mexico
Dr. Patricia Zambrano , Universidad Autónoma de Nuevo León, San Nicolas de los Garza, Mexico
Dr. Carlos Poblano , Centro de Tecnologia Avanzada, El Marques, Mexico
Dr. Citllalli Gaona , Universidad Autonoma de Nuevo Leon, Apocada, Nuevo León, Mexico
The corrosion properties of Ni-Cr-W-Mo coatings processed by high velocity oxy-fuel thermal spraying were studied as a function of annealing heat treatment at 850°C and 950°C. Immersion tests in NaCl, NaOH, HCl and water media with various electrochemical techniques such as linear polarization resistance (LPR), potenciodynamic polarization curves (PPC) and electrochemical impedance spectroscopy (EIS) were employed to perform such evaluation. Hardness of coatings was measured by microhardness tests. The results showed that corrosion resistance of coatings was improved by increasing the annealing temperature, which in turn was closely related to the microstructural changes of the coating promoted by the heat treatment.
See more of: Tribological, Oxidation, Corrosion Behavior of Aerospace-based Coatings
See more of: Advanced Coatings for the Aerospace Industry