Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
DEVELOPMENT AND CHARACTERIZATION OF Ni-P-CARBON BLACK COMPOSITE COATINGS BY ELECTROLESS PLATING ON API 5L X80 PIPELINE STEEL
Submission Author:
Eloana Patrícia Ribeiro , SP
Presenter: Eloana Patrícia Ribeiro
doi://10.26678/ABCM.COBEF2017.COF2017-0116
Abstract
The purpose of the present work was to develop Ni-P-carbon black composite coatings on API 5L X80 pipeline steel substrate using electroless deposition. Three different plating baths were tested, varying the carbon black concentration from 0.25 g.L-1 up to 1.0 g.L-1. After deposition, the coatings were solution annealed at 400 ºC for 1h. The corrosion resistance was evaluated in a 3.5 wt.% NaCl solution at room temperature using electrochemical impedance spectroscopy and potentiodynamic polarization curves. Film morphology was assessed by scanning electron microscopy (SEM). Confocal laser scanning microscopy was used to evaluate the surface roughness of the different composite coatings. The coefficient of friction was evaluated using a nanotribometer. The results showed that the corrosion resistance was improved after carbon black incorporation. However, this effect was dependent on the carbon black concentration. Film roughness increased with the carbon black loading as well as the coefficient of friction. Ni-P-carbon black composite coatings showed improved surface properties with respect to the conventional binary Ni-P layer.
Keywords
Ni-P-carbon black coating, electroless deposition, Wear, corrosion, API 5L X80 pipeline steel
