abstract
For 100 years WC-Co has been the quintessential hardmetal, finding extensive application whenever high hardness and wear resistance are required. However, recent concerns regarding health and economic factors have motivated both industry and academia to explore alternative composites. Consequently, numerous hard phases and metallic binders are currently under evaluation. To expedite and streamline the development process, a crucial question arises: "Can the corrosion resistance of hardmetals be predicted based on the electrochemical behavior of their binders?". To help answer this question, this work compares the corrosion resistances of various hardmetal composites (WC-Co, WC-Ni, WC-CoNi, WC-CoCr, WC-NiCr, WC-CoNiCr, WC-NiCrMo, and WC-FeCoNi) to the corrosion resistances of binder analogues (Co, Ni, CoNi, CoCr, NiCr, CoNiCr, NiCrMo, and FeCoNi) in a 0.5 M NaCl solution using electrochemical techniques: open circuit potential monitoring, polarisation curves and galvanic current between WC and binder measured with zero resistance ammeter (ZRA).
keywords
WC-CO; ELECTROCHEMICAL-BEHAVIOR; CEMENTED CARBIDES; TUNGSTEN; POLARIZATION; COBALT
subject category
Materials Science; Metallurgy & Metallurgical Engineering
authors
Rocha, AMF; Santos, AM; Mineiro, R; Pereira, P; Sacramento, J; Senos, AMR; Bastos, AC
our authors
Alexandre Manuel Ferro Rocha
PhD Student
Ana Maria de Oliveira e Rocha Senos
Collaborator
António Alexandre Cunha Bastos
Assistant ResearcherGroups
G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings
Projects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC), and project HARDTECH-POCI-01-0247-FEDER-045283, financed by FEDER under PT2020 Partnership Agreement. A.M. Ferro Rocha thanks FCT for the PhD grant SFRH/BD/147060/2019. A.C. Bastos is funded by national funds (OE), through FCT-Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.