Effect of the addition of calcium carbonate on the barrier behavior of polyamide 11 used in offshore applications by electrochemical impedance analysis

Silveira, Mariana Rodrigues da; Ivancko, Izabel Nunes; Valério, Murilo Barbosa; Reznik, Leila Yone; Carvalho, Ladimir José de; Rodrigues, Aline da Costa; Silva, Ana Lúcia Nazareth da

doi:10.1016/j.polymertesting.2018.05.047

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…Actualmente la verificación de recubrimientos internos realizados a tuberías de transporte de gas, agua y crudo son inspeccionados en las empresas de aplicación por medio de técnicas como la espectroscopia de impedancias (EIS), el análisis de superficies por ultrasonido y la inducción de campos magnéticos por medio de corrientes parasitas [1].…”

Section: Introductionunclassified

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Aperador-Chaparro

Castiblanco

2020

AiBi Revista de Investigación, Administración e Ingeniería

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El presente paper describe el diseño y la construcción de un equipo que permite la verificación de conexiones soldadas de tuberías recubiertas internamente, utilizadas en el transporte de fluidos del sector petrolero, permitiendo caracterizar las diferentes fallas que ocurren en los procesos de soldadura e instalación antes de poner en operación los sistemas de transporte, este equipo permite hacer la detección de fallas y problemas que pueden presentarse en los procesos de instalación, haciendo uso de la técnica de espectroscopia de impedancias electroquímica (EIS). El equipo cuenta con un sistema mecánico para el desplazamiento del sistema de medición a lo largo de tuberías de 6 a 12 pulgadas de diámetro. Permite detectar fallas en los recubrimientos como lo son ampollas, grietas, fisuras y quemaduras producidos principalmente por el transporte y las altas temperaturas en los procesos de soldadura. El sistema cuenta con un equipo de medición basado en la técnica de espectroscopia de impedancias (EIS) y una interfaz de usuario que permite mover el dispositivo a lo largo de la tubería, controlar el punto de medición realizando barridos en 4 puntos principales a 0°,90°,180° y 270°, almacenando los datos de medición y procesándolos en una interfaz gráfica en Matlab, el diseño de portabilidad cuenta con un sistema de comunicación Bluetooth y un cable umbilical de alimentación para energizar el sistema y hacer la conexión a tierra de la tubería. Los ensayos realizados durante el desarrollo del equipo permitieron caracterizar la impedancia de varias superficies y asociar rangos a las diferentes imperfecciones en los recubrimientos.

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Section: Introductionunclassified

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Aperador-Chaparro

Castiblanco

2020

AiBi Revista de Investigación, Administración e Ingeniería

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Failure Behavior and Damage Mechanism of Acrylic Polyurethane Coating in Tropical Marine Atmospheric Environment

Zhao¹

2020

International Journal of Electrochemical Science

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Acrylic polyurethane coating was exposed to the tropical marine atmospheric environment for 24 months, and the physical, chemical and protective properties of the coating were investigated. The results demonstrated that the appearance, adhesion and protective property of the coating were degraded rapidly in the early exposure stage, and then changed slowly in the late exposure stage. During the filed exposure test, the ultraviolet irradiation was a major contributor to polyurethane chain scission of the coating, and the chain scission was mainly characterized by the rupture of C-N bonds. Moreover, the thermal stability of the coating was less affected by the tropical marine atmospheric environment.

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Adsorption of Heavy Metals on Soil Collected from Lixisol of Typical Karst Areas in the Presence of CaCO3 and Soil Clay and Their Competition Behavior

Zhang

et al. 2020

Sustainability

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The content of heavy metals in the soil in Guizhou Province, which is a high-risk area for heavy metal exposure, is significantly higher than that in other areas in China. Therefore, the objective of this study was to evaluate the ability of CaCO3 and clay to accumulate heavy metals in topsoil sample collected from Lixisol using the method of indoor simulation. The results showed that the contents of Cu, Zn, Cd, Cr, Pb, Hg and As in the soil sample were 10.8 mg/kg, 125 mg/kg, 0.489 mg/kg, 23.5 mg/kg, 22.7 mg/kg, 58.3 mg/kg and 45.4 mg/kg, respectively. The soil pH values increased with the CaCO3 concentration in the soil, and the fluctuation of the soil pH values was weak after the CaCO3 concentrations reached 100 g/kg. The adsorption capacity of lime soil increased by approximately 10 mg/kg on average, and the desorption capacity decreased by approximately 300 mg/kg on average. The desorption of all heavy metals in this study did not change with increasing clay content. Pseudo-second-order kinetics were more suitable for describing the adsorption kinetics of heavy metals on the soil material, as evidenced by the higher R2 value. The Freundlich model can better describe the adsorption process of As on lime soil. The process of As, Cr, Cd and Hg adsorption on the soil sample was spontaneous and entropy-driven. Additionally, the process of Cu and Pb adsorption on the soil materials was spontaneous and enthalpy-driven. Generally, the adsorption and desorption of heavy metals in polluted soil increased and decreased, respectively, with increasing CaCO3 content. The effect of calcium carbonate on the accumulation of heavy metals in soil was greater than that of clay. In summary, CaCO3 and pH values in soil can be appropriately added in several areas polluted by heavy metals to enhance the crop yield and reduce the adsorption of heavy metals in soils.

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Effect of the addition of calcium carbonate on the barrier behavior of polyamide 11 used in offshore applications by electrochemical impedance analysis

Cited by 3 publications

References 28 publications

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Equipo para la verificación de conexiones soldadas de tuberías recubiertas internamente

Failure Behavior and Damage Mechanism of Acrylic Polyurethane Coating in Tropical Marine Atmospheric Environment

Adsorption of Heavy Metals on Soil Collected from Lixisol of Typical Karst Areas in the Presence of CaCO3 and Soil Clay and Their Competition Behavior

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