Engineering of Cathodic Protection Systems

Fitzgerald, J. H.

doi:10.1002/9780470872864.ch69

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…In practical use of the steels, some corrosion protection such as Zn coatings and cathodic protections are applied normally. 4 The concept of these corrosion protections is to keep the corrosion potential of steels negative, however it enhances the risk of the hydrogen entry. In terms of the corrosion protection of the steels under the atmospheric environments, the steels with high hydrogen absorption resistance have been required.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

2017

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In order to prevent hydrogen entry into steels, the effect of the plasma nitriding treatment on the hydrogen permeation behavior of pre irons was investigated in this study. The plasma nitriding was performed in a nitrogen-hydrogen atmosphere composed of 75 % N 2 -25 % H 2 at 400 ºC and 600 Pa for 3.6 ks. The nitrogen compound layer was composed of -Fe 2-3 N and '-Fe 4 N phases, and its thickness was ca. 2.8 m. The hydrogen permeation tests revealed that the hydrogen absorption efficiency of the nitrided pure iron was one fiftieth that of the untreated one. In addition, the nitrided pure iron had a lower diffusion coefficient than the untreated one. The nitrided layer acts as an effective barrier against the hydrogen entry and diffusion in pure iron.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

2017

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“…A detailed description of such CP systems can be found elsewhere. 2,3 The objective of CP systems is to catholically polarise the pipeline, typically within the − 850 to − 1200 mV CSE potential range. More negative CP potentials may be required for mill scaled steel, when microbiologically induced corrosion (MIC) is suspected, in weak acid environments, or at high operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

An overview of major methods for inspecting and monitoring external corrosion of on-shore transportation pipelines

Varela

Tan

Forsyth

2015

Corrosion Engineering, Science and Technology

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Corrosion can occur on underground pipelines especially at coating defects, where metal can be considered directly exposed to the soil, or under disbonded coatings, where the occluded geometry significantly affects the efficiency of cathodic protection (CP). In order to ensure the effectiveness of corrosion mitigation measures such as CP and protective coatings, inspection and monitoring of pipeline corrosion are required. This paper provides an overview of major methods that are used for inspecting and monitoring external corrosion of on-shore pipelines subjected to CP. Particular focus is on discussing the advantages and limitations of major inspection tools that are used to ensure pipeline integrity, and electrochemical corrosion sensors that are designed to monitor pipeline corrosion processes and rates. It is shown that there is a need for expanding the capabilities of corrosion monitoring methods suitable for the pipeline industry.

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“…Cathodic protection (CP) is widely recognised as the most cost effective and technically appropriate corrosion prevention methodology for the submerged zone of offshore structures and deep sea facilities. 1,2 However, excessive cathodic polarisation would increase the generation and absorption of cathodic hydrogen, which could cause cracking in susceptible high strength steels that are used in marine structures and deep sea facilities. The susceptibility to hydrogen embrittlement becomes greater while the strength level of the steels increases.…”

Section: Introductionmentioning

confidence: 99%

Effects of cathodic polarisation on hydrogen embrittlement susceptibility of X70 steel in low temperature and low dissolved oxygen seawater

Zhang

et al. 2013

Corrosion Engineering, Science and Technology

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The hydrogen induced cracking of X70 pipeline steel was investigated in low temperature and low dissolved oxygen seawater (4uC and 3-4 mg L 21 dissolved oxygen) by potentiodynamic polarisation, slow strain rate tests and hydrogen permeation measurements. The results showed that the hydrogen evolution potential of X70 steel in low temperature and low dissolved oxygen seawater decreased compared with the normal shallow seawater. The susceptibility to hydrogen embrittlement increased as the potential shifted in the negative direction. When the polarisation potentials were below 21050 mV(SCE) in low temperature and low dissolved oxygen seawater, the fracture surfaces exhibited quasi-cleavage fracture.

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Engineering of Cathodic Protection Systems

Cited by 4 publications

References 3 publications

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

Hydrogen Entry into Pure Iron Treated by Plasma Nitriding

An overview of major methods for inspecting and monitoring external corrosion of on-shore transportation pipelines

Effects of cathodic polarisation on hydrogen embrittlement susceptibility of X70 steel in low temperature and low dissolved oxygen seawater

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