CIDEPINT   05376
CENTRO DE INVESTIGACIONES EN TECNOLOGIA DE PINTURAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Tribological Properties of Tin And Bronze Coatings Electrodeposited From Acid Baths
Autor/es:
L. BENGOA; N. ZABALA; W. R. TUCKART; W. EGLI
Lugar:
Buenos Aires
Reunión:
Workshop; 2º International Workshop of Tribology- TRIBaires 2013; 2013
Institución organizadora:
Asociación Argentina de Tribología
Resumen:
The aim of this work is to develop an acidic non-cyanide electrolyte for the electrodeposition of high quality bronze coatings and evaluate their tribological behavior. To this end Cu+2 additions were done to PSA and MSA based tin-plating electrolytes. Tin deposits were also obtained from both baths. For the PSA electrolyte industrial additives were used. In the case of the MSA solution a study of organic additives was necessary previously to obtain a homogeneous deposit. Cyclic voltammetry was used to study different organic additives added to the solutions. The deposits obtained were characterized with scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction The friction coefficient and wear resistance of tin, copper and copper-tin alloy coatings was studied through dry sliding wear tests carried out with a homemade ball on ring system. A novel cyanide-free bath for the electrodeposition of bronze was developed. The deposit obtained has a mono-phase (α-phase) matrix (77%Cu-23%Sn). Tin coatings were electrodeposited from different electrolytes and these coatings presented differences in morphology and tribological properties. The tin coating electrodeposited from a PSA-bath has a lower coefficient of friction and higher wear resistence than tin deposit obtained from a MSA electrolyte and bronze coating.