Water Transport in Organic Coatings

Bellucci, Francesco; Nicodemo, L.

doi:10.5006/1.3316044

“…The coating capacitance increases rapidly in the beginning of immersion (0-24 h), which tends to be an approximate constant after that. The rapid increase of the coating capacitance in the initial period denotes that the water permeates into the coatings through the micropores [14]. Then the appearance of the plateau part of the curve refers to the fact that the water uptake reaches a saturation state.…”

Section: Corrosion Analysis By Eismentioning

confidence: 99%

Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂

Li

¹

,

Tian

²

,

Hou

³

2010

Materials & Corrosion

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Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion performance of nanoparticulate SiO 2 modified epoxy coatings on carbon steel in 3.5 wt% NaCl solution, coupled with salt spray test. Capacitancegravimetric methods and delamination tests were performed to analyze the water uptake behavior and interface stability against delamination of modified coatings, respectively. Four systems were studied, including a clear coating and three pigmented coatings (with 1, 2, and 3 wt% nanoparticulate SiO 2 ). The experimental results showed that nanoparticulate SiO 2 particles can improve the anti-corrosion performance of the coatings and the optimal addition content is 2 wt%. The results obtained with capacitance-gravimetric measurements showed that the diffusion process of water through epoxy coatings with different pigment volume concentration (PVC) obeyed the second Fick's diffusion law in the initial period. Adding nanoparticulate SiO 2 into epoxy coatings can act effectively. The positive influence is attributed to the reaction between nanoparticles and epoxy resin which is confirmed by FTIR, improving the barrier and dispersion effectiveness of coatings. The negative one is increasing the number of pores in the coatings when the adding amount is beyond the critical PVC.

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“…Water permeation by osmosis or electro-osmosis [10] through the coating is the seventh cause of failure, which establishes the formation of electrochemical cells providing conditions for corrosion to occur.…”

Section: Corrosion Conceptsmentioning

confidence: 99%

Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline

Mora-Mendoza

¹

,

Saucedo-Robles

²

,

Rodríguez-Clemente

³

et al. 2011

Materials & Corrosion

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The objective of this study consisted in investigating the possible causes which give rise to the presence of low wall pipe thicknesses on a 16 00 natural gas transport pipeline, even though during the last 12-year period cathodic protection (CP) potentials were kept in the protection range at which external corrosion should not occur. Results from in-line inspection from a 16 00 natural gas transport pipeline showed 46 indications with more than 80% wall thickness lost due to external corrosion in the second segment of the pipeline. Direct inspection at the indication locations, review of the CP system performance, pipeline maintenance programs and studies, allowed to make an integral diagnostic where it was found out that the main cause of external corrosion was an inappropriate coating application since the pipeline construction, this situation has originated the increase of CP shielding effects through time.

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“…The solution to this equation can be expressed either as a distribution of concentration [43] or as a saturation function, φ, which corresponds to the ratio between the mass of water contained in the coating at an instant t and at saturation, M t /M ∞ . In this last form, the complete solution is given by a summation [44][45][46][47]:…”

Section: Transport Of Water and Ionsmentioning

confidence: 99%

“…(20). Bellucci and Nicodemo [45] have made a theoretical approach of the subject. A review of several models proposed for the determination of water absorption as well as experimental comparison was made by Lindqvist [53], who observed that for a large number of coatings and for the conditions under test, the best agreement with gravimetric results was obtained with the Brasher-Kingsbury equation [55]:…”

Section: Relevant Parametersmentioning

confidence: 99%

Corrosion Protection by Organic Coatings

Grundmeier

¹

,

Simões

²

2003

Encyclopedia of Electrochemistry

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The sections in this article are Introduction The Composition of Corrosion Protecting Organic Coatings Binder Pigments Anticorrosive Pigments Fillers and Additives Solvents Transport Phenomena in Organic Coatings Transport of Oxygen Transport of Water and Ions Adhesion of Organic Coatings Introduction to the Mechanisms of Protection and Degradation Mechanisms of Protection Blistering Corrosion Initiation Cathodic Delamination Anodic Undermining Application of Electrochemical Methods for the Characterization of the Protective Properties of Organic Coatings on Metals Monitoring of the Open Circuit Potential Electrochemical Impedance Spectroscopy Basic Analysis Equivalent Circuits Relevant Parameters Electrochemical Noise Scanning Reference Electrode Techniques The Application of the Scanning Kelvin Probe System Metal–Polymer–Humid Air System Metal–Oxide–Polymer–Humid Air System Metal–Metal Oxide–Electrolyte–Polymer–Humid Air Sample Preparation for SKP Measurements Corrosion Mechanisms of Polymer‐coated Metals Corrosion of Polymer‐coated Iron Introduction Cathodic Delamination on Polymer‐coated Iron Degradation of the Interface by the Oxygen Reduction Process Corrosion of Polymer‐coated Zinc and Galvanized Steel Cathodic Delamination on Polymer‐coated Zinc Cathodic Protection in the Case of Polymer‐coated Galvanized Steel FFC on Polymer‐coated Iron, Aluminum, and Magnesium Introduction to FFC Initiation of FFC Propagation of Filaments Transport of Oxygen Electrochemical and Auxiliary Measurements of FFC Influence of Surface Treatments and Compositions of Organic Coatings on the Corrosion Kinetics Conversion Coatings Adhesion Promoters and Interfacial Thin Films Influence of Pigments in Paints Intrinsically Conducting Polymers Overall Conclusions

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Water Transport in Organic Coatings

Cited by 214 publications

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Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂

Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂

Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline

Corrosion Protection by Organic Coatings

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Water Transport in Organic Coatings

Cited by 214 publications

References 0 publications

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2

Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline

Corrosion Protection by Organic Coatings

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Product

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Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂

Corrosion performance of epoxy coatings modified by nanoparticulate SiO₂