AMPP Store - Products tagged with 'shielding'

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51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures

Product Number: 51318-10544-SG

Author: Mehrooz Zamanzadeh / George T. Bayer / Anil Kumar Chikkam

Publication Date: 2018

$20.00

Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.

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51318-10955-CP shielding effect on buried pipeline by complex bridge structure

Product Number: 51318-10955-SG

Author: Christophe Baeté / Nick Kioupis

Publication Date: 2018

$20.00

Cathodic Protection of a 57 km long pipeline section requires a few milliAmps of CP current. A new motorway bridge is built above the pipeline causing a potential risk of shielding the low cathodic current.

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Application Of Direct Assessment Methods In Arid And “Sabkha” Environments

Product Number: 51321-16756-SG

Author: Naim Dakwar; D. L. van Oostendorp

Publication Date: 2021

$20.00

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Cathodic protection shielding and prevention of the corrosion under disbonded coating in soils

Product Number: 51323-19248-SG

Author: Erwan Diler, Nicolas Larche, Jean Vittonato, François Castillon, Sylvain Fontaine, Thierry Kerzerho, Patrice Lucas, Eric Agel

Publication Date: 2023

$20.00

Organic coatings protect the underlying metallic substrate against corrosion by acting as a barrier to corrosive species such as water, ions, and oxygen. Unfortunately, coatings might contain defects and could degrade or disbond under some environmental conditions, resulting in favorable pathways for such corrosive species.

Barrier protection is one of the modes by which intact coatings provide protection to metal substrates through a reduction of the transport of materials, ions, or charge.

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CP Shielding and Pipeline Coatings

Product Number: 41206-285-SG

Author: Greg Ruschau

Publication Date: 2006

$20.00

Shielding of cathodic protection (CP) by pipeline coatings poses a serious threat to pipeline integrity. The difficulty in pipeline coating selection to avoid shielding is that the same properties that make a pipeline coating a good corrosion mitigation material can also lead to CP shielding. The key to proper coating selection is to select a coating that has the necessary properties to provide good corrosion protection but also one that, when disbondment and failure occurs, fails in such a way to allow effective cathodic protection.

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Fusion Bonded Epoxy Coatings (FBE) and Disbondment

Product Number: 51316-7246-SG

ISBN: 7246 2016 CP

Author: Mehrooz Zamanzadeh

Publication Date: 2016

$20.00

In this paper, failure analysis methodology will be applied to the principal mechanisms by which FBE coatings fail during long term service; with specific application to case studies involving blistering. The case studies apply standard failure analysis techniques to determine the primary causes and modes of failures.

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Impact of Foam Trench Breakers and Ditch Pads on Pipeline Cathodic Protection

Product Number: 51317--9002-SG

ISBN: 9002 2017 CP

Author: James Ellor

Publication Date: 2017

$20.00

The testing covers the impacts of various commercial Structural polyurethane foam materials on cathodic protection current distribution on coated pipelines based on laboratory testing of key performance parameters.

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Overview of latest advances in measuring and understanding cathodic protection current permeability by organic coatings

Product Number: 51320-14685-SG

Author: Facundo Varela, Mauricio Latino, Yongjun Tan, Maria Forsyth

Publication Date: 2020

$20.00

Shielding of cathodic protection (CP) by disbonded coatings is considered a “worst case scenario” for external corrosion in the pipeline industry. It has been hypothesized that if coatings were partially permeable to CP, the imbalance between cathodic and anodic reactions would induce a high pH environment under disbonded coatings and that would impede corrosion. However, direct experimental evidence of this process has been limited. Moreover, this line of reasoning is often inversed incorrectly assuming that the only reason for the presence of a high pH environment under disbonded coatings is their partial permeability to CP current.

The recent development of an electrochemical self-validating technique to measure the relatively small ionic currents that could permeate through defect free coatings has shed a new light on the topic. It has been found that most of the commercial pipeline coatings tested in unaged conditions present a CP shielding behavior. Accelerated hydrothermal ageing of fusion-bonded epoxy (FBE) coatings was performed to study the effect of water absorption. Ageing resulted in major plasticization, which increased the conduction of CP current through FBE coatings. However, FBE seems to be partially permeable to H+ and/or OH-, which reduces its ability to form and retain a high pH environment under disbonded coatings. In conjunction, these results thus indicate the extremely limited capability of commercial pipeline coatings to prevent corrosion in case of disbondment.

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Overview Of Latest Advances In Understanding The Limited Ability Of Fusion Bonded Epoxy To Stop Corrosion Within Disbondments

Product Number: 51321-16808-SG

Author: Facundo Varela; Mauricio Latino; Yongjun Tan; Maria Forsyth

Publication Date: 2021

$20.00

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Surface treated metallic bipolar plates as an alternative to platinized titanium

Product Number: 51323-19247-SG

Author: Jakub Ludvík, Richard Bureš, Milan Kouřil, Hala Miroslav, Fojt Jaroslav, Michalcová Alena, Iryna Danylo

Publication Date: 2023

$20.00

Organic coatings protect the underlying metallic substrate against corrosion by acting as a barrier to corrosive species such as water, ions, and oxygen. Unfortunately, coatings might contain defects and could degrade or disbond under some environmental conditions, resulting in favorable pathways for such corrosive species.

Barrier protection is one of the modes by which intact coatings provide protection to metal substrates through a reduction of the transport of materials, ions, or charge.

Available for download

Testing of Coatings for Shielding of Cathodic Protection Currents

Product Number: 51220-235-SG

Author: Ben Bussard

Publication Date: 2020

$20.00

When a coating disbonds from a structure and prevents cathodic protection (CP) from reaching the metal surface, this is known as “shielding” behavior by the coating. Shielding is a serious issue that has been a contributing cause for several pipeline failures, and expensive replacement programs. There are many factors (Soil resistance, holidays, coating resistance, etc.) that determine whether the coating will behave this way. Federal regulations for transmission gas pipelines require the use of a non-shielding coating.

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TR21447-2020, Consequences of Coating Failures as Related to Interaction with Cathodic Protection

Product Number: TR21447-2020

Publication Date: 2020

$109.00

The purpose of this NACE International technical report is to provide basic information regarding the mechanisms involved with cathodic protection (CP) shielding for external coatings applied to carbon steel pipelines, and the manner in which the breakdown of coating systems may or may not contribute to CP shielding. It is intended to be a basic reference from which the tendency of a coating system to fail and shield CP may be understood on a conceptual basis. Non-corrosion-related pipeline protection systems, including concrete weight coating, polyethylene encasement, insulation, and mechanical pipeline protection systems, are outside the scope of this report. End users of this report may include pipeline designers, corrosion engineers, integrity management specialists, regulators, CP service providers, coating suppliers, coating service providers, equipment suppliers, and pipeline/facility owners.

Products tagged with 'shielding'

Association for Materials Protection and Performance