TITLE:
Enhancement of Corrosion Resistance of NiCrFeBSi Coatings Obtained by Flame Thermal Spray Process Adding an Electroless Nickel Coating Ni-P
AUTHORS:
Arturo Barba-Pingarrón, Raúl Valdez-Navarro, Félix Sánchez-De Jesus, Ana María Bolarín-Miró, Rafael González-Parra, Alba Covelo-Villar, Miguel Ángel Hernández-Gallegos, Carlos Domínguez-Ríos
KEYWORDS:
Flame Thermal Spray Coatings, Electroless Nickel Plating, Duplex Coatings, Corrosion Resistance
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.7 No.4,
October
31,
2017
ABSTRACT: Flame Thermal Spray (FTS) coatings frequently show some porosity and reduced adherence to substrate, which affect its properties, especially its corrosion resistance. In this work, the corrosion resistance of AISI 1018 carbon steel coated by different methods is compared: electroless nickel (EN) coating, NiCrFeBSi obtained by FTS, duplex coatings of an EN deposit on a layer of NiCrFeBSi obtained by FTS and a layer of NiCrFeBSi on an EN deposit. The coatings were characterized using optical microscopy and scanning electron microscopy techniques, EDS microprobe microanalysis, roughness as well as electrochemical polarization tests to obtain the corrosion rate. The results show the enhancement in the corrosion resistance in saline medium of the duplex coatings, especially of the EN coating on FTS layer.