Enhancement of Corrosion Resistance of NiCrFeBSi Coatings Obtained by Flame Thermal Spray Process Adding an Electroless Nickel Coating Ni-P

Barba-Pingarrón, Arturo; Valdez-Navarro, Raúl; Jesús, F. Sánchez-De; Bolarín-Miró, A.M.; González-Parra, Rafael; Covelo, Alba; Hernández-Gallegos, Miguel Ángel; Domínguez-Ríos, Carlos

doi:10.4236/jsemat.2017.74008

Cited by 2 publications

(1 citation statement)

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“…Anyway, blending Fe-Cr-Ni-Si-B-C composite coatings with 20 wt.% and 40 wt.% of a WC-12 wt.% Co powder and spraying this composite powder with HVOF and high velocity air-fuel (HVAF) processes improved the abrasive wear resistance of Fe-based coatings [12]. Flame thermal spray duplex system composed of NiCrFeBSi plus Ni-P electroless nickel extended the corrosion resistance of NiCrFeBSi, with the Ni-P surface coating sealing the porosity of the coating [13]. Miguel et al [14] realized a comparison between the wear modes of the NiCrBSi coating deposited by APS, HVOF, and sprayed/fused processes, with the wear behavior of the APS deposited coating being found the worst.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Analysis and Tribological Behavior of AMDRY 1371 (Mo–NiCrFeBSiC) Atmospheric Plasma Spray Deposited Thin Coatings

et al. 2020

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Water treatment plants include a set of pumping stations, and their mechanical components experience various wear modes. In order to combat wear, the mechanical components of the pumps are coated with various types of wear resistant coatings. In this research, AMDRY 1371 (Mo–NiCrFeBSiC) coatings were deposited with the atmospheric plasma spray (APS) method on parallelepipedal steel samples manufactured from a worn sleeve of a multistage vertical irrigation pump. In order to find an optimum thickness of AMDRY 1371 coatings, the samples were coated with five, seven and nine passes (counted as return passes of the APS gun). Mechanical properties of the coating (microhardness and Young’s modulus) were determined by micro-indentation tests. An AMSLER tribometer was used to investigate the wear resistance and wear modes of the coated samples in dry conditions. A mean coefficient of friction (CoF) of around 0.3 was found for all the samples, but its evolution during the one hour of the test and also the final wear volumes and wear rates depended on the thickness of the coating. To estimate the roughness of the surfaces and the wear volumes, measurements were carried out on a Taylor Hobson profilometer. In order to understand the nature and evolution of wear of coatings of various thicknesses, the unworn and worn surfaces of the coated samples were analyzed by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The wear modes of the coatings were studied, emphasizing the coating removal process for each sample. According to our results, for each dry friction application, there is an optimum value of the thickness of the coating, depending on the running conditions.

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Section: Introductionmentioning

confidence: 99%