Comparison of hydrogen embrittlement susceptibility of three cathodic protected subsea pipeline steels from a point of view of hydrogen permeation

Zhang, Timing; Zhao, Weimin; Li, Tingting; Zhao, Yujiao; Deng, Qiushi; Wang, Yong; Jiang, Wenchun

doi:10.1016/j.corsci.2017.11.013

Cited by 122 publications

(21 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hydrogen effective diffusivity and hydrogen trapping site characteristics are the key to evaluate hydrogen embrittlement susceptibility of such advanced high-strength steels [ 10 ]. Since trapping sites can significantly decrease hydrogen effective diffusivity [ 6 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ], permeation curves obtained by means of Devanathan–Stachurski cell [ 11 , 12 ] have been widely utilized to examine hydrogen effective diffusivity, as well as trapping site characteristics [ 6 , 11 , 12 , 13 , 15 , 16 , 17 ]. Generally, the hydrogen trapping site can be divided into reversible and irreversible types according to its strength level to bind with hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation on Analysis Methods of Trapping Site Density in Steels Based on Hydrogen Permeation Curve

Yang

Cheng

2020

Materials

View full text Add to dashboard Cite

Hydrogen permeation techniques have been widely utilized to extract hydrogen effective diffusivity, as well as hydrogen trapping site characteristics in steels. Several methods have been proposed to examine reversible and irreversible trapping site characteristics. However, the inappropriate utilization of these simplified models, as well as incorrect value assignment to the key parameters, can result in several orders of magnitude difference in hydrogen trapping site density. Therefore, in order to evaluate these models and verify their application prerequisites, a serial of hydrogen permeation tests were numerically simulated and examined, separately considering reversible and irreversible hydrogen trapping sites. In the meantime, suggestions were given to conduct hydrogen permeation test more effectively, and evaluate hydrogen trapping site characteristics more precisely.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation on Analysis Methods of Trapping Site Density in Steels Based on Hydrogen Permeation Curve

Yang

Cheng

2020

Materials

View full text Add to dashboard Cite

show abstract

“…Cathodic overprotection (E < −1100 mV vs. SCE) is particularly deleterious for the insurgence of HE phenomena, as reported in the most widespread design guidelines [11][12][13]. It is expected that there would be more evident research on high-strength steels, because they are generally considered more susceptible to hydrogen embrittlement [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeation in X65 Steel under Cyclic Loading

et al. 2020

View full text Add to dashboard Cite

This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the role of trapping—both reversible and irreversible—on the diffusion mechanism. Under loading conditions, a marked shift to the right of the permeation curves was noticed mainly at values exceeding the tensile yield stress. In the presence of a relevant plastic strain, the curve changes due to the presence of irreversible traps, which efficiently subtract diffusible atomic hydrogen. A significant reduction in the apparent diffusion coefficient and a considerable increase in the number of traps were noticed as the maximum load exceeded the yield strength. Cyclic loading at a tensile stress slightly higher than the yield strength of the material increases the hydrogen entrapment phenomena. The tensile stress causes a marked and instant reduction in the concentration of mobile hydrogen within the metal lattice from 55% of the yield strength, and it increases significantly in the plastic field.

show abstract

“…Thus, the contradictory reports make it difficult to suggest the effect of the hydrogen on the two steels studied. However, Zhang et al [62] reported HE index of 35% and 45% for X80 steels when tested at potentials of −1055 mV and −1155 mV (Ag/AgCl/saturated KCl) in deaerated seawater at a strain rate of 10 −6 s −1 . This study gives some indication of the HE potential of X80 in deaerated seawater under ECP, but it does not give any information on the propensity of HE when coated with TSA.…”

Section: Location Of Hydrogen In Tsa-coated Steelmentioning

confidence: 99%

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Paul

2020

Surfaces

View full text Add to dashboard Cite

Thermally sprayed aluminium (TSA) coatings provide protection to offshore steel structures without the use of external cathodic protection (CP) systems. These coatings provide sacrificial protection in the same way as a galvanic anode, and thus hydrogen embrittlement (HE) becomes a major concern with the use of high strength steels. The effect of TSA on the HE of steel seems to remain largely unknown. Further, the location of hydrogen in TSA-coated steel has not been explored. To address the above knowledge gap, API 5L X80 and AISI 4137 steel coupons, with and without TSA, were prepared and the amount of hydrogen present in these steels when cathodically polarised to −1.1 V (Ag/AgCl) for 30 days in synthetic seawater was determined. One set of TSA-coated specimens was left at open circuit potential (OCP). The study indicates that the amount of hydrogen present in TSA-coated steel is ~100 times more than the amount found in uncoated steel, and that the hydrogen seems to be largely localised in the TSA layer.

show abstract

Comparison of hydrogen embrittlement susceptibility of three cathodic protected subsea pipeline steels from a point of view of hydrogen permeation

Cited by 122 publications

References 48 publications

Numerical Evaluation on Analysis Methods of Trapping Site Density in Steels Based on Hydrogen Permeation Curve

Numerical Evaluation on Analysis Methods of Trapping Site Density in Steels Based on Hydrogen Permeation Curve

Hydrogen Permeation in X65 Steel under Cyclic Loading

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Contact Info

Product

Resources

About