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51316-7152-Self-healing protection of pipeline corrosion by epoxy coating with preloaded inhibitors

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Self-healing coatings for corrosion protection refer to those with the ability to sense the corrosive environment and to release preloaded inhibitors from the coating matrix by a controlled mode. In this work, SiO2 nanoparticle based polyelectrolyte nanocontainers were fabricated by the LbL method to store corrosion inhibitor BTA.

 

 

Product Number: 51316-7152-SG
ISBN: 7152 2016 CP
Author: Frank Cheng
Publication Date: 2016
Industry: Coatings and Linings
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$20.00
$20.00

Epoxy coatings are one of the most commonly used coatings for corrosion protection in oil/gas pipelines. However the coating would experience degradation in service. Particularly when a corrosive environment is generated under disbonded coating or at coating defects and cathodic protection is shielded from reaching the pipeline steel corrosion or stress corrosion cracking would occur. This is a typical mechanism resulting in pipeline failures.An active self-healing protection of steel corrosion based on sensing of the corrosive environment and controlled released of preloaded inhibitors from the coating matrix provides a promising method for pipeline corrosion protection. This coating provides not only a barrier to the environment but also a smart release of corrosion inhibitors which are preloaded into the coating as demanded by coating damage/degradation and the presence of a corrosive environment on steel to attain a long-term protection effect.In this work benzotriazole (BTA) inhibitors were deposited on the surface of nano-SiO2 particles which served as the inhibitor carriers. Poly-electrolytes were then absorbed on the particle surface by a layer-by-layer method. As a result the BTA was encapsulated between the poly-electrolytes and nano-SiO2 particles. The inhibitor-loaded containers were incorporated into an epoxy coating. The release of inhibitors was triggered by the pH change of the environment resulting in a self-healing corrosion protection for the steel. The scanning electron microscope and transmission electron microscope were used to characterize the morphology and structure of inhibitor-containing capsules and the thermal gravity analysis was used to determine the thermal stability of the epoxy coating loaded with the capsules. The corrosion resistance of the coating was measured by the electrochemical impedance spectroscopy in simulated electrolyte trapped under coating and the soil solution. The ability of the loaded inhibitors for corrosion inhibition at coating defects was studied by scanning vibrating electrode technique and localized electrochemical impedance spectroscopy at a microscopic scale. The mechanism of the self-healing coating for pipeline corrosion protection was discussed in terms of the triggering and release of pre-loaded inhibitors and the inhibition of interfacial corrosion reactions.

 Key words: downloadable, Self-healing, Smart coating, Nano SiO2, Epoxy coating, Pipeline

Epoxy coatings are one of the most commonly used coatings for corrosion protection in oil/gas pipelines. However the coating would experience degradation in service. Particularly when a corrosive environment is generated under disbonded coating or at coating defects and cathodic protection is shielded from reaching the pipeline steel corrosion or stress corrosion cracking would occur. This is a typical mechanism resulting in pipeline failures.An active self-healing protection of steel corrosion based on sensing of the corrosive environment and controlled released of preloaded inhibitors from the coating matrix provides a promising method for pipeline corrosion protection. This coating provides not only a barrier to the environment but also a smart release of corrosion inhibitors which are preloaded into the coating as demanded by coating damage/degradation and the presence of a corrosive environment on steel to attain a long-term protection effect.In this work benzotriazole (BTA) inhibitors were deposited on the surface of nano-SiO2 particles which served as the inhibitor carriers. Poly-electrolytes were then absorbed on the particle surface by a layer-by-layer method. As a result the BTA was encapsulated between the poly-electrolytes and nano-SiO2 particles. The inhibitor-loaded containers were incorporated into an epoxy coating. The release of inhibitors was triggered by the pH change of the environment resulting in a self-healing corrosion protection for the steel. The scanning electron microscope and transmission electron microscope were used to characterize the morphology and structure of inhibitor-containing capsules and the thermal gravity analysis was used to determine the thermal stability of the epoxy coating loaded with the capsules. The corrosion resistance of the coating was measured by the electrochemical impedance spectroscopy in simulated electrolyte trapped under coating and the soil solution. The ability of the loaded inhibitors for corrosion inhibition at coating defects was studied by scanning vibrating electrode technique and localized electrochemical impedance spectroscopy at a microscopic scale. The mechanism of the self-healing coating for pipeline corrosion protection was discussed in terms of the triggering and release of pre-loaded inhibitors and the inhibition of interfacial corrosion reactions.

 Key words: downloadable, Self-healing, Smart coating, Nano SiO2, Epoxy coating, Pipeline

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