Abstract
In this research work, Co-B/SiC composite coatings were synthesized by electrochemical deposition from colloidal suspensions with different content of SiC. The Co-B/SiC films obtained were heat treatment at 350 °C. The composition, morphology, and structure of the Co-B/SiC composite coatings were analyzed using glow discharge spectrometry (GDS), scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Hardness and tribological properties were also studied. The results showed that an increase in the SiC concentration in the colloidal suspensions resulted in both an increase in the SiC content and a decrease in the B content in the obtained Co-B/SiC coatings. The Co-B/SiC coatings were adherent, glossy, and soft, and exhibited a homogeneous composition in all thicknesses. Besides, an increase in the SiC particle content of the Co-B/SiC composite coating from 0 to 2.56 at.% SiC reduced the hardness of the film from 680 to 360 HV and decreased the wear volume values from 1180 to 23 μm3 N−1 m−1, respectively (that is, the wear resistance increased). Moreover, when the Co-B/SiC coatings with SiC content ranging from 0 to 2.56 at.% SiC were subjected to a heat treatment process, the obtained coating hardness values were in the range of 1200 to 1500 HV, and the wear volume values were in the range of 382 to 19 μm3 N−1 m−1.
Highlights
Surface degradation is one of the main damages experienced by metallic parts of mechanical devices which are subjected to extreme working conditions, e.g., high friction, high temperatures, corrosive environments
The study of the stability of SiC particles suspended in electrolytic baths containing the dispersant cetyltrimethylammonium bromide (CTAB) was carried out using a colloidal suspension of composition
The stability of the SiC particles suspended in colloidal suspensions S0 + x g L−1 SiC (x = 0.0, 0.15, 0.6, 2.5, 5.0, 10.0, 15.0) at pH 5.0 was analyzed at 25 ◦ C using the Turbiscan analyzer, an instrument that allows analyzing the stability of colloidal suspensions for long periods of time
Summary
Surface degradation is one of the main damages experienced by metallic parts of mechanical devices which are subjected to extreme working conditions, e.g., high friction, high temperatures, corrosive environments. The deterioration of the surface of these metallic parts causes the continuous decrease in their tribological properties (i.e., friction, wear resistance) and hardness, causing failures in the operation of the machinery. Hard coatings such as cadmium (Cd), nickel (Ni), or chromium (Cr) have been widely used to protect metal components and tools against wear. Coatings 2019, 9, 279 mechanical properties such as wear resistance, friction and hardness, the Environmental Protection. Agency (EPA) of the United States, list these elements as priority pollutants, and they are considered to be among the 17 most toxic heavy metals [1]. For these reasons, alternative materials have been studied for many years. Composite coatings have recently been studied as an alternative to hard
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