Abstract
Co-Ni/SiC nanocomposite coatings were obtained by codeposition of SiC nanoparticles in a bath with nickel and cobalt, using API 5L X80 as the substrate. The influence of cathodic current density on deposit properties was investigated. Measurements of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) were performed in 3.5 wt% NaCl solution to investigate a corrosion performance. The morphology and chemical analysis of the surfaces were analyzed by scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and related with micro-hardness and X-ray diffraction (XRD). The results indicate which composite coatings have acicular morphology, with higher micro-hardness values than those found for the carbon steel substrate. The Co-Ni/SiC coating increased the corrosion potential and the resistance to polarization, which resulted in lower corrosion rates than those obtained without uncoated steel.
Highlights
There has been a considerable increase in the interest in investigating composite coatings due to their unique mechanical properties, self-lubricity, thermal stability, oxidation, corrosion and wear resistance[1,2]
Composite coatings were obtained at a galvanosatic control and a chronopotentiometric monitoring was performed for the different cathodic current conditions investigated, according to Figure 1
Potentials attained for each condition as a consequence of applied current became more negative as the deposition current densities were more cathodic
Summary
There has been a considerable increase in the interest in investigating composite coatings due to their unique mechanical properties, self-lubricity, thermal stability, oxidation, corrosion and wear resistance[1,2]. Composite electrodeposition refers to a process in wich particles are suspended in the electrolyte and subsequentely embedded into an electro-formed solid phase[3]. Among the various composite coating systems produced by the combination of different matrix and reinforcement materials, Ni/SiC composite coatings have been widely studied in order to explore the impact of the co-deposition conditions and the properties of the deposited coatings. Only few investigations have been made regarding the electrodeposition of Co-Ni/SiC nanocomposite coatings, which may feature favorable mechanical, corrosion and tribological properties[10]
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