Evaluación de la resistencia de la corrosión de grafeno sobre un sustrato de cobre

Triana Martínez, Rudolf Arthur

Evaluación de la resistencia de la corrosión de grafeno sobre un sustrato de cobre

dc.contributor.advisor	Olaya Florez, Jhon Jairo	spa
dc.contributor.advisor	Prieto de Castro, Carlos	spa
dc.contributor.author	Triana Martínez, Rudolf Arthur	spa
dc.contributor.researchgroup	AFIS	spa
dc.date.accessioned	2020-07-17T22:10:59Z	spa
dc.date.available	2020-07-17T22:10:59Z	spa
dc.date.issued	2020-01-31	spa
dc.description.abstract	Este trabajo de investigación se realiza un estudio de la resistencia a la de corrosión de recubrimientos (película de grafeno monocapa) sintetizados mediante deposición química de vapor (CVD) en sustratos de cobre. Este nanomaterial presenta propiedades como película impermeable, estabilidad química, térmica y otras cualidades (mecánicas, eléctricas, y ópticas) que lo proponen como un candidato para la protección de metales ante diferentes ambientes electroquímicos. Para la caracterización morfológica y estructural de las películas de grafeno, se evaluaron antes de la prueba de corrosión mediante la Microscopía Óptica Confocal y la Espectrometría Raman. Se estudió la corrosión química del óxido de cobre en las películas del recubrimiento a un tiempo corto (6 meses) y largo plazo (12 meses). La resistencia a la de corrosión de las muestras de las películas de grafeno monocapa en los sustratos de cobre se estudiaron mediante Espectrometría de Impedancia Electroquímica y Ensayos de Polarización Potenciodinámica utilizando diferentes electrolitos (0.5M HCl, 0,5M H2SO4,3,5wt% NaCl, 3,5% NaCl+0,5M H2SO4 y Na2S2O3 +NaCl +CH3 COOH). Para la morfología y caracterización después de las pruebas de corrosión se utilizo la Microscopía Auger, Microscopía Óptica Confocal, Espectrometría Raman y Microscopía Electrónica de Barrido (MEB). El grafeno monocapa sin defectos es un recubrimiento óptimo para la protección de metales ante los ambientes corrosivos ácidos y salinos. Los defectos del recubrimiento proporcionan el flujo de iones de los electrolitos y de la oxidación química que permite la delaminación e inducen a acelerar la corrosión. Por otro lado también se promueve la formación del grafeno multicapa en la huella de corrosión. En este trabajo se observa que mediante los electrolitos 0,5M H2SO4 y 3,5 wt% NaCl se obtiene un mejor comportamiento a la resistencia a la corrosión con respecto al sustrato sin recubrimiento. Como acto culminante el trabajo permite discutir frente a los mecanismos de corrosión del grafeno en el sustrato de cobre, su proyección en el estudio de propiedades físico- químicas del recubrimiento en electródos metálicos y la búsqueda de alternativas para la protección del cobre utilizando películas de grafeno.	spa
dc.description.abstract	This research work develops a study on corrosion resistance in coatings (single-layer graphene film) synthesized by chemical vapor deposition (CVD) on copper substrates. Single-layer graphene has properties such as waterproof film, chemical and thermal stability, among other qualities (mechanical, electrical, and optical). These properties make graphene a candidate for the protection of metals against different electrochemical environments. The morphological and structural characterization of graphene films was performed before the corrosion test by Confocal Optical Microscopy and Raman Spectrometry. The chemical corrosion of copper oxide in the coating films at a short time (6 months) and long term (12 months) was studied. The corrosion resistance of single-layer graphene film samples on copper substrates were evaluated by Electrochemical Impedance Spectrometry and Potentiodynamic Polarization Tests, using different electrolytes (0.5M HCl, 0.5M H2SO4.3.5wt% NaCl , 3.5% NaCl + 0.5M H2SO4 and Na2S2O3 + NaCl + CH3 COOH). For morphology and characterization, after the corrosion tests, Auger Microscopy, Confocal Optical Microscopy, Raman Spectrometry and Scanning Electron Microscopy (MEB) were used. Graphene monolayer without defects is an optimal coating for the protection of metals against corrosive acid and saline environments. Defects in the coating generate the flow of electrolyte ions and chemical oxidation that allows delamination and foster the acceleration of corrosion. On the other hand, the formation of multilayer graphene in the corrosion trace is also promoted. This work shows that by means of 0.5M H2SO4 and 3.5 wt% NaCl electrolytes, a better corrosion resistance behavior is obtained, with respect to the uncoated substrate. Finally, the work allows us to discuss the corrosion mechanisms of graphene in the copper substrate, its projection in the study of physicochemical properties of the coating on metal electrodes and the search for alternatives for the protection of copper using graphene films.	spa
dc.description.degreelevel	Maestría	spa
dc.format.extent	201	spa
dc.format.mimetype	application/pdf	spa
dc.identifier.uri	https://repositorio.unal.edu.co/handle/unal/77796
dc.language.iso	spa	spa
dc.publisher.branch	Universidad Nacional de Colombia - Sede Bogotá	spa
dc.publisher.program	Bogotá - Ingeniería - Maestría en Ingeniería - Materiales y Procesos	spa
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dc.rights	Derechos reservados - Universidad Nacional de Colombia	spa
dc.rights.accessrights	info:eu-repo/semantics/openAccess	spa
dc.rights.license	Atribución-NoComercial-SinDerivadas 4.0 Internacional	spa
dc.rights.spa	Acceso abierto	spa
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/	spa
dc.subject.ddc	620 - Ingeniería y operaciones afines::622 - Minería y operaciones relacionadas	spa
dc.subject.proposal	Película de Grafeno	spa
dc.subject.proposal	Single-layer Graphene Film	eng
dc.subject.proposal	Chemical vapor deposition	eng
dc.subject.proposal	Deposición Química de Vapor	spa
dc.subject.proposal	Corrosion Resistance	eng
dc.subject.proposal	Resistencia a la corrosión	spa
dc.subject.proposal	Grafeno	spa
dc.subject.proposal	Graphene	eng
dc.subject.proposal	Nanomateriales	spa
dc.subject.proposal	Nanomaterials	eng
dc.title	Evaluación de la resistencia de la corrosión de grafeno sobre un sustrato de cobre	spa
dc.type	Trabajo de grado - Maestría	spa
dc.type.coar	http://purl.org/coar/resource_type/c_bdcc	spa
dc.type.coarversion	http://purl.org/coar/version/c_ab4af688f83e57aa	spa
dc.type.content	Text	spa
dc.type.driver	info:eu-repo/semantics/masterThesis	spa
dc.type.version	info:eu-repo/semantics/acceptedVersion	spa
oaire.accessrights	http://purl.org/coar/access_right/c_abf2	spa