Corrosion resistance of Cr2 O3 coatings measured through EIS

Castellanos, Laura Marcela Dimate; Flórez, Jhon Jairo Olaya; Orjuela, José Edgar Alfonso

doi:10.14482/inde.35.1.8941

Cited by 4 publications

(2 citation statements)

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“…This behavior is probably due to the low oxidation of Bi and Si in the sintering process and to the good adhesion of the films to the substrate 23,24 . It can also be attributed to the morphological influence in the films concluding that they have a homogeneous structure with small grains but present some pores allowing the working electrolyte to pass through the interface substrate coating and lead to possible delamination of the Film 25,26 . In the evaluated system (film-substrate), there is a cathodic reaction on the surface of the coating and an anodic reaction produced on the surface of the substrate.…”

Section: Resultsmentioning

confidence: 99%

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Bautista-Ruiz¹,

Aperador²,

Olaya³

2018

RJC

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In this investigation, the compound Bi24Si40O2 was synthesized via sol-gel and applied on substrates of 316L stainless steel by spin coating varying speed. In the coatings obtained, the corrosion response in simulated physiological solution was evaluated by electrochemical impedance spectroscopy and polarization potentiodynamic curves. The morphology and surface topography was studied, also, were determined the microstructure, thickness values and roughness of the coatings. The results of this study allow establishing a high degree of anticorrosive effectiveness offered by the coatings as a function of the number of layers applied to the substrate and their possible application in the biomedical industry.

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Section: Resultsmentioning

confidence: 99%

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Bautista-Ruiz¹,

Aperador²,

Olaya³

2018

RJC

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“…Decorative chromium coatings are cathodic and are used to improve the appearance of the base material and provide corrosion resistance in moderate environments. In addition, coating with trivalent chromium solutions can be a technically and economically feasible alternative to changing conventional chromium plating processes that are toxic and contaminating [1], Substrate preparation prior to coating is important because any contamination that may prevent the adhesion of the coating must be removed [2].In relation to high temperature corrosion resistance testing of NiCr and NiCrBSiFe coatings it is evident that NiCr and NiCrBSiFe coatings are resistant up to 450 °C and NiCrBSiFe up to 500 °C [3]. The carbon content in the base metal has a significant influence on the morphology, thickness and microhardness of the chromium layers obtained from the refractory chromite [4].…”

Section: Introductionmentioning

confidence: 99%

Physical-Mechanical Characterization Applied to the Adhesion of Electrolytic Metal Chromium Plating on Bus Rims Surfaces

Lara

Carvajal

Arteaga

et al. 2019

SSP

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This experimental investigation evaluates the adherence of metal chromium plating on SAE-1026 cold-formed carbon steel surfaces for bus rims, the test-pieces were prepared in compliance with the ASTM-B456 standard regarding their size and surface. The study involves varying the parameters of the coating process, such as time, temperature and voltage, with the selection of critical tests that influence the adhesion of chromium plating such as: adhesion test where the strength with which the metallic coating is bonded to another surface was obtained based on ASTM D 3359-09, Vicker hardness test with the resistance that the material exhibits against permanent deformation established by ASTM B578-87, thickness test in the coating of metal substrates applying ASTM B456 and corrosion test by subjecting the surface to acetic salt mist (AASS) under strict preparation, cleaning and evaluation of ASTM G46-94. The optimal results discovered are 60 min. 40 °C and 7V in the nickel bath and 2min. 15 °C and 6V in chrome. In order to improve the results obtained from the experiments, the proposal is to cover with a layer of alkaline copper coating, reducing the anti-corrosion and adhesion properties.

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Evaluation of tribological wear and corrosion in coatings of diamalloy 4060NS deposited by thermal spray

2017

J. Phys.: Conf. Ser.

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Abstract. Surface engineering seeks the development of new techniques to improve the performance and life of components of machines or industrial facilities, always looking for low costs and the least possible environmental damage. Thermal projection is one of the techniques that is based on the projection of particles of compounds and alloys on properly prepared and heated substrates, these particles are driven by a stream of air passing through an oxyacetylene flame which gives the energy to the process; These coatings give the possibility to improve the properties of the materials or the maintenance of components to maximize the availability of service. In order to reduce the damage caused by wear and corrosion of a low carbon AISI 1020 steel, they were coated with a metal based alloy, studying the effect of the cobalt-chromiumsilicon-tungsten carbide alloy coating (DIAMALLLOY 4060 NS). The coating was deposited with two different pressures in the gases supplied to the torch, obtaining two flames and working three thicknesses of coating that oscillate between 100-500μm, according to the number of deposited layers, making use of a projection gun Castolin Eutectic. Powder and substrate characterization was performed using X-Ray Diffraction (XRD) techniques, X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), spark emission spectroscopy and metallographic analysis. The results confirm the chemical nature and structure of the powder of the alloy and the substrate to be used, in addition, the thermal stability of the system was verified. The evaluation of the adhesion of the deposited layers was carried out by the implementation of pull-off tests according to ASTM D4541, in order to determine the type of failure that is presented. Mechanical wear was determined using a MT/60/NI microtest tribometer while electrochemical tests were performed using a suitable experimental unit for this purpose, confirming that the substrate exhibits lower wear levels when coated with Layers between 300-400μm, demonstrating that the implemented methodology allows to reduce the process of wear of mechanical parts subjected to aggressive operating conditions.

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Corrosion resistance of Cr2 O3 coatings measured through EIS

Cited by 4 publications

References 0 publications

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Physical-Mechanical Characterization Applied to the Adhesion of Electrolytic Metal Chromium Plating on Bus Rims Surfaces

Evaluation of tribological wear and corrosion in coatings of diamalloy 4060NS deposited by thermal spray

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