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86 results on '"Cruz, Ricardo"'

4. Bmpti Corrosion Inhibition for API 5L X70 Steel in Saline Medium

Author

Jacobo Mora, D.S., primary, Rodriguez-Gomez, Francisco, additional, Flores Álvarez, J. F., additional, González Olvera, R., additional, Negrón Silva, Guillermo E., additional, Orozco Cruz, Ricardo, additional, Galván Martínez, Ricardo, additional, and Vazquez, Araceli ESPINOZA, additional

Published
2023
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6. Electrochemical Evaluation of the Metal-Media Interface of a Calcareous-Formed Al-Base Alloy Immersed in a Synthetic Seawater Solution

Author

Rico, Juan Pablo, primary, Galván Martínez, Ricardo, additional, Vazquez, Araceli Espinoza, additional, Carmona-Hernandez, Andrés, additional, Vázquez Márquez, Alejandra, additional, Martínez Cosío, María de los Angeles, additional, Mejía-Sánchez, Edgar, additional, Hernandez, Miguel Ángel, additional, and Orozco Cruz, Ricardo, additional

Published
2023
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9. Electrochemical Evaluation of 3´-(2,6-dimethoxybenzoyl)-Benzyl 2,6-Dimethoxybenzoate As a Corrosion Inhibitor in API 5L X70 Immersed in Saline Medium

Author

Hernández Olivé, O. J., primary, Vazquez, Araceli, additional, Mejía-Sánchez, Edgar, additional, Pérez Vásquez, Araceli, additional, Mata, Rachel, additional, Galván Martínez, R., additional, Hernandez, Miguel Ángel, additional, Carmona-Hernandez, Andrés, additional, and Orozco Cruz, Ricardo, additional

Published
2023
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39. Study of the Variation of the Voltage and Time of the Process in the Anodizing of TiO2with HCl

Author

Hernández Montiel, Samuel, Hernández Torres, Julian, Araujo Pérez, Daniel de Jesús, Orozco Cruz, Ricardo, Morales Hernandez, Jorge, Zamora Peredo, Luis, and García González, Leandro

Abstract

Electrochemical anodizing is one of the processes that due to its practicality, versatility, and excellent results has been used for decades for the oxidation of any metallic surface and the formation of nanostructures. In the present work was anodized commercially pure titanium using a solution based on hydrochloric acid, ethylene glycol, and deionized water. Varying the voltage from 21 to 24 volts was observed the formation of tube-shaped nanostructures in the anodized samples like a characteristic growth due to the use of HCl in the solution. Using Raman spectroscopy were identified the vibrational modes corresponding to the anatase phase. Using Vickers Microhardness and Nanoindentation it was demonstrated that the mechanical behavior was favored in the sample obtained with 24 Volts and growth time of 60 minutes. Finally, the TiO2layers obtained improved the friction coefficient value of the titanium sheet, reducing its value from 0.8 to 0.4.

Published
2021
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40. Electrochemical Evaluation of Acanthocereus TetragonusExtract Corrosion Inhibitor for Aluminum in NaCl (0.6 M) and HCl (1 M)

Author

Méndez Figueroa, Henevith Gisell, Galvan-Martinez, Ricardo, López-López, Ari Yamir, Ramirez-Fernandez, Jose Arturo, and Orozco Cruz, Ricardo

Abstract

In this work, Acanthocereus tetragonusextract from stems ripe was used as corrosion inhibitor for aluminum in NaCl (0.6 M) and HCl (1 M). The extract was added in 50 ppm, 100 ppm, and 200 ppm and evaluated at 0 h, 6 h, 12 h, and 24 h with Linear Polarization Resistance (LPR), Electrochemical Impedance Spectroscopy (EIS), and Polarization Curves (PC). As results, the efficiency shows an increase with longer exposure time. Moreover, the efficiencies reached 76% in NaCl (0.6 M) and 52% in HCl (1 M), with 50 ppm after 24 h in both electrolytes.

Published
2021
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41. Electrochemical Study of the Protective Capacity of Artificial Patina of CuS04Exposed in an Urban-Marine Atmosphere

Author

Triana-Romero, Andres Alberto, Galván Martínez, R., Mejía-Sánchez, Edgar, Aleman-Xolo, Karen Citlali, Hernandez, Miguel Ángel, and Orozco Cruz, Ricardo

Abstract

The damage caused by atmospheric pollutants, chlorides, and sulfates, is evident in historical metallic monuments. Therefore, it is vitally important to analyze these interactions to ensure adequate conservation. The electrochemical behavior was studied using Linear Polarization Resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS) of quaternary bronze with an artificially formed patina with CuSO4representing a historical metal exposed in the atmosphere and thus obtaining information about its degradation process during a determined time. The results show that charge and mass transfer processes were carried out by varying the resistances of the patinas during the weeks that they were exposed, reaching to observe a diffusive and metastable process due to the formation of corrosion products that lead to an increase in the resistance of charge transfer.

Published
2021
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46. Electrochemical Evaluation of Hydrotalcite Mg /Alwith Caffeine in the Protection in AZ31 Alloy

Author

Acosta Gordillo, Yordhi, Espinoza Vazquez, Araceli, Rodríguez, Francisco, Flores Álvarez, J. F., Negrón Silva, Guillermo E., Delgado Reyes, G., Orozco Cruz, Ricardo, and Galván Martínez, Ricardo

Abstract

The present work is an electrochemical evaluation of hydrotalcite Mg/Al impregnated with caffeine for the protection of the AZ31 alloy, where different concentrations of the inhibitor were evaluated to determine the best result in order to be applied as a coating in orthopedic uses. The efficiency of the hydrotalcite coating as a function of concentration was determined using electrochemical impedance spectroscopy and it was shown that HT MgAl with 5 ppm perezone impregnated achieved 99% inhibition efficiency.

Published
2023
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47. Analysis of the Morphology, Structure and Hardness of TiO2Anodized with HCl and the Incorporation of K2Cr2O7in the Solution

Author

Hernández Montiel, Samuel, García González, Leandro, Hernández Torres, Julian, Zamora Peredo, Luis, Ferreira Palma, Carlos, and Orozco Cruz, Ricardo

Abstract

It was possible to obtain TiO2doped with K and Cr by electrochemical anodizing technique. An unexplored synthesis route was considered where the electrolyte used for the anodization was HCl and K2Cr2O7as the precursor of the incorporated metals. Subsequently, the heat treatment temperatures of 400, 500, 600, 600, 700 and 800 °C were varied in order to observe the morphological, structural and hardness changes of the obtained films. The presence of nanotubes was observed on the anodized surface and the samples were annealed at 400, 500 and 600 °C, and grain formation for the samples were annealed at 700 and 800 °C. The presence of K and Cr in the TiO2structure, together with the temperature changes, favored the transformation of anatase to rutile, which gave a hardness improvement of up to 4.8 times more compared to that of titanium without any treatment.

Published
2022
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48. Electrochemical Analysis of a SiO2Film on Alternative Rust Converter to Preserve Ferrous Alloys in Historical Heritage

Author

Arceo-Gómez, David Enrique, Aguilar, Juan Carlos, Reyes, Javier, Galvan-Martinez, Ricardo, and Orozco-Cruz, Ricardo

Abstract

The preservation of metallic materials of cultural heritage requires new strategies and protection alternatives. Rust converters offer protective properties to corrosion products, but it´s not enough. In this work, a SiO2 film was applied forming silane/rust converter system. Chemical and morphological characterization was performed by scanning electronic microscopy coupled to X-ray energy dispersive spectrometer (SEM-EDS). Protective film properties were studied by electrochemical techniques such as polarization resistance and electrochemical impedance spectroscopy. The morphology of SiO2on a rust converter was amorphous. Heat treatment at 105 °C, improved the protective properties of the coating, increasing its impedance values relatives to a coating without heat treatment.

Published
2019
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49. Study of the Protective Capability of a SiO2 Nanolayer over a Copper Sulphate Patina

Author

Jimenez- Sanchez, Tania, Galvan-Martinez, Ricardo, Fajardo, Gerardo, Cruz Moreno, Dulce, Hernandez-Perez, Miguel Angel, and Orozco-Cruz, Ricardo

Abstract

In this work, the application of a nanocovering of SiO2on artificial sulphate patina and exposed to the atmosphere was sprayed with the objective of analyzing the degradation mechanisms and protective capability. The development of the nanocovering was carried out by sol-gel synthesis using as a precursor Orto Tetraethylsilicate (TEOS). The morphological and structural characterization of nanocoating was performed using Scanning Electron Microscopy (MEB) and X-ray Diffraction (DRX), resulting in an amorphous structure of SiO2and nanoparticle sizes from 82.7 to 92.4 nm. The nanocovering was evaluated using the electrochemical techniques of Polarization Resistance (Rp) and Electrochemical Impedance Spectroscopy (EIE) using a 3.5% NaCl gelled cell and agar as electrolyte. The electrochemical behavior of the coating in the first days showed an increase in the Rtc, after the week of exposure a decrease in the protective properties of the nano coating was observed.

Published
2019
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50. Assessment ofMimosa TenuifloraExtract as Rust Converter for the Protection of Historical Heritage Metallic Materials

Author

Morteo-Flores, Omar, Galvan-Martínez, Ricardo, Fernández-Gómez, Imelda, Mejía-Sánchez, Edgar, and Orozco-Cruz, Ricardo

Abstract

Tannic extract of the Mimosa Tenuiflorawas assessed as a rust converter using Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization Resistance (LPR) techniques. The tannic extract was applied on pre-corroded AISI 1018 steel plates before a commercial epoxy coating. Four different specimens were prepared and submerged in two solutions, 0.51 M NaCl and 0.1 M Na2SO4. All systems were inspected for 40 days in search of changes in the coatings. The exposure time and the reaction time of the rust converter are important factors to obtain good performance.

Published
2017
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