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

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

In offshore oilfield exploration, flexible pipe technology has gained importance as a convenient and effective way to connect seafloor wellheads to sea level oil platforms. This structure has several layers each one presenting specific functions: polymeric layers – fluid barrier and metal layers – m...

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Bibliographic Details
Published in:Polymer testing Vol. 69; pp. 410 - 416
Main Authors: Rodrigues da Silveira, Mariana, Ivancko, Izabel Nunes, Valério, Murilo Barbosa, Reznik, Leila Yone, José de Carvalho, Ladimir, da Costa Rodrigues, Aline, Nazareth da Silva, Ana Lúcia
Format: Journal Article
Language:English
Published: Barking Elsevier Ltd 01-08-2018
Elsevier BV
Subjects:
Barrier property
Barriers
Calcium
Calcium carbonate
Carbon steels
Composite materials
Composites
Corrosion resistance
Crude oil
Diffusion layers
Electrochemical impedance spectroscopy
Electrode polarization
Eletrochemical impedance spectroscopy
Flexible pipes
Insulation
Ion diffusion
Mechanical properties
Microparticles
Nanoparticles
Offshore drilling rigs
Offshore platforms
Oil field equipment
Polyamide 11
Polyamide resins
Polymers
Sea beds
Sea level
Wellheads
Polyamide 11
Composites
Barrier property
Calcium carbonate
Eletrochemical impedance spectroscopy
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Summary:In offshore oilfield exploration, flexible pipe technology has gained importance as a convenient and effective way to connect seafloor wellheads to sea level oil platforms. This structure has several layers each one presenting specific functions: polymeric layers – fluid barrier and metal layers – mechanical strength. Polyamide-11 (PA11) was one of the first polymers used for the internal insulation layers in flexible pipes used in offshore oilfield exploitation. The aim of this work is to evaluate the effect of calcium carbonate particle size (nanoparticles – NPCC and microparticles – PCC) on the barrier properties of PA11 matrix, the grade used in the pressure layer of flexible pipes, towards the diffusion of ions and molecules present in crude oil. This evaluation was based on acquisition of Electrochemical Impedance Spectroscopy data, which helps to interpret the metallic corrosion behavior. The results indicated that the PA11/NPCC system formed a better protective corrosion barrier over carbon steel due to its higher polarization resistance when compared to neat PA11 and PA11/PCC composite. •Electrochemical impedance spectroscopy (EIS) technique can support barrier behavior investigation.•EIS is a sensitive technique capable of showing the evolution of the medium interaction with coated or uncoated metal.•EIS is a sensitivity technique to study the protection of films based on PA11 and PA11/CaCO3 composites on carbon steel.•EIS results showed the higher protective behavior of system with CaCO3 nanoparticles in relation to microparticles.•SEM micrographs showed the poor interaction between CaCO3 microparticles and PA11 matrix.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.05.047