Banca de DEFESA: AMARALINA LITUÂNIA MORAIS MARINHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AMARALINA LITUÂNIA MORAIS MARINHO
DATE: 22/08/2023
TIME: 08:30
LOCAL: https://meet.google.com/vcs-ahqy-tuy
TITLE:

Evaluation of the effects of graphene addition in carbide-based coatings applied by HVOF

KEY WORDS:

Graphene Oxide; Thermal Spray; HVOF; Coating, WC-Co

PAGES: 64
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

Hard metal-based coatings are widely used in the oil and gas industries to increase the life of steels. However, these coatings are also subject to oxidation, chemical corrosion, and erosion when subjected to working cycles with a combination of physical wear and chemically aggressive environments. Thus, the addition of nanoparticles to the composition of tungsten carbide-based coatings can be an alternative, as they can improve the properties of the carbide, such as wear and corrosion resistance. The anodic polarization technique allows for the electrochemical behavior of a metal to be studied in the laboratory, i.e., its tendency to remain active or passive, by constructing potential curves as a function of current and its susceptibility to pitting corrosion. In this work, graphene oxide was mixed with tungsten carbide-cobalt at different weight concentrations of 0, 0.5, 0.75, and 1% and applied on 1020 steel substrate using the HVOF thermal spray using the HVOF thermal spray method. XRD, SEM-FEG, and cyclic voltammetry tests, also known as reverse anodic potentiodynamic tests, were carried out to characterize the compositions. Thus, it was noted that the anticorrosive properties of WC-Co coating with the addition of graphene oxide were not compromised when at least 1% of graphene was present in the mixture. However, compositions with a lower amount of graphene showed worse anticorrosive properties than the coating with 0% graphene.

COMMITTEE MEMBERS:
Presidente - 345842 - UILAME UMBELINO GOMES
Interna - 3352345 - MARIA JOSE SANTOS LIMA
Interno - 2414250 - MEYSAM MASHHADIKARIMI
Interno - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Externo à Instituição - RAMON SIGIFREDO CORTÉS PAREDES - UFPR