Evaluation of Co-Ni/SiC Nanocomposite Coating Obtained by Electrodeposition on the Corrosion Resistance of API 5L X80 Steel

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.

Evaluation of the Multi-Structural Potential of Ni-Co/SiC Nanocomposite Coatings Electrodeposited in API 5L X80 Steel

“…The behavior observed between the micro-hardness values and the SiC content of the samples surface was similar to that observed by Pereira et al, who associated the micro-hardness with the nanoparticulate SiC content in Co-Ni/SiC nanocomposite coating electrodeposited in API 5L X80 steel 16 . Bakhit analyzed the influence of the SiC particle size on the nanocomposite structure and tribological properties and found that increasing the concentration of SiC particles incorporated in the Ni-Co nanocomposite results in increased micro-hardness 36 .…”

“…The coatings were obtained by galvanostatic deposition technique using a single bath and a single cathodic current density value (5.5 A dm -2 ). The cathodic current density value was defined by a previous study and corresponded to the current condition, wich was able to obtain the coating with the best properties for this system 16 . The bath pH was maintained at 4.5, it was adjusted with NH 4 OH or H 2 SO 4 when necessary 7 .…”

“…The growing interest in research on Ni-Co/SiC nanocomposite coatings shows that it is possible to obtain these electrodeposits on several metallic surfaces, such as copper, aluminum, sintered NdFeB material and mild steel, for example 1,8,[14][15][16] . Despite these possibilities, few studies have been focused on obtaining nanocomposite coating in carbon steel wich is a very important material in the industry and requires protection.…”

“…Despite these possibilities, few studies have been focused on obtaining nanocomposite coating in carbon steel wich is a very important material in the industry and requires protection. The Ni-Co / SiC nanocomposite coating was the subject of a previous study 16 that showed excellent corrosion resistance and hardness properties when applied to API 5L X80 steel, a material used in pipelines in the oil industry. Yang and Cheng 4 studied the application of the coating against erosion-enhanced corrosion of carbon steel pipes in oilsand slurry.…”

Mechanical characteristics of Ni50Co50/Ni substrate during indentation by molecular dynamics

“…Wang et al [16] reported that the wear resistance of NiCo film is higher than the pure Ni one. Pereira et al [17] researched the corrosion resistance characteristics of NiCo film deposited on a steel surface. However, the structure transformation and deformation behaviours of the NiCo film still needs further study to shed more light on its structure and mechanical properties.…”