51315-6093-Electrochemical Characterization in CO2 Saturated Environment of Zn-Rich Epoxy Nanocoatings on API X52 Pipeline Grade Steel Substrate Under Flow Conditions

Available for download

Product Number: 51315-6093-SG

ISBN: 6093 2015 CP

Author: Violeta Goujon

Publication Date: 2015

Member Price: $0.00

Non Member Price: $20.00

Price: $20.00

Qty:

Electrochemical Characterization in CO2 saturated environment of Zn-Rich Epoxy nanocoatings on API X52 pipeline grade steel substrate under flow conditionsVioleta Valencia-Goujon Enrique Maya-Visuet Homero Castaneda-LopezChemical and Biomolecular EngineeringNational Center for Research on CorrosionThe University of AkronAkron OH 44325USA.Chemical inhibitors are the most common practice for internal corrosion protection of pipelines in oil and gas production and transportation operations. Although effective some chemicals forming the inhibitor mixture constitute an environmental hazard. Therefore a more environmental friendly alterative consists of considering internal coatings as a solution for corrosion prevention and protection.This work aims the electrochemical characterization of a zinc-rich epoxy nano coating primer (ZREP) and a composite variation incorporating carbon nanotubes (CNT-ZREP) on API X52 pipeline grade steel substrate. A rotating cylinder electrode (RCE) was used to incorporate the turbulent flow regime and equivalent shear stress conditions. The selected electrolyte for testing was 3% wt. NaCl saturated with CO2. The physical barrier against corrosion from this nanocomposite coatings is brought as a result from the combined effects of Zn and C nanoelements imparting special properties not initially inherent in the matrix or in the nanoelements themselves. The effect of these medium conditions over the performance of the substrate/coating system was characterized in real time by electrochemical impedance spectroscopy. The Damage evolution concept was adopted to analyze the current stages and approach possible mechanisms of CNT anodic inhibition and Zn cathodic protection in the primer that provide the enhanced protection to the substrate.