resumo
WC-Ni-Cr-Mo are good candidates for replacing WC-Co for its better corrosion performance. This work investigated the effect of different Mo content on the mechanical properties and corrosion susceptibility of WC-Ni-Cr-Mo composites in chloride and sulphate acidic media. Chemical, microstructural, and electrochemical analysis were performed. Results show chlorides are frankly more aggressive than sulphates, but additions of up to 0.6 wt% in Mo can enhance the active-passive transition, particularly in the presence of chlorides, and guarantee the passive state in sulphates. Also, Mo was effective in hindering WC grain growth and in increasing hardness in 5%, simultaneously reducing toughness in 4%.
palavras-chave
AUSTENITIC-STAINLESS-STEELS; PITTING CORROSION; FERRITIC-STAINLESS; BIPOLAR MODEL; GRAIN-SIZE; BEHAVIOR; CO; MOLYBDENUM; HARDMETALS; ADDITIONS
categoria
Materials Science; Metallurgy & Metallurgical Engineering
autores
Santos, RF; Rocha, AMF; Bastos, AC; Cardoso, JP; Rodrigues, F; Fernandes, CM; Sacramento, J; Ferreira, MGS; Senos, AMR; Fonseca, C; Vieira, MF; Malheiros, LF
nossos autores
Alexandre Manuel Ferro Rocha
Estudante de doutoramento
António Alexandre Cunha Bastos
Investigador Auxiliar
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)Projectos
HARDCorr - Desenvolvimento de metal duro com elevada resistência ao desgaste e à corrosão (HardCorr)
agradecimentos
This research work was financed by Portugal 2020 through European Regional Development Fund (FEDER) in the frame of Operational Competitiveness and Internationalization Programme (POCI) and the scope of the project HARDCorr (POCI-01-0247-FEDER-003382).