Hydrogen blistering and hydrogen-induced cracking in amorphous nickel phosphorus coating

Zhou, Qingjun; Li, Qiao; Qi, Hui-bin; Li, J.X.; He, Jianying; Wuyang, Chu

doi:10.1016/j.jnoncrysol.2007.06.037

Cited by 15 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S2c†) developed under the cathodic galvanostatic deposition process. 74–76 The visual observation during the electrodeposition process confirmed the formation of a plenty amount of hydrogen bubbles once the electrodeposition process starts (Video S1†). Moreover, it is detected from the time–potential curve for the deposition process (Fig.…”

Section: Resultsmentioning

confidence: 77%

Modifying the 316L stainless steel surface by an electrodeposition technique: towards high-performance electrodes for alkaline water electrolysis

Alhakemy

Nassr

Kashyout

et al. 2022

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 77%

Modifying the 316L stainless steel surface by an electrodeposition technique: towards high-performance electrodes for alkaline water electrolysis

Alhakemy

Nassr

Kashyout

et al. 2022

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The detail has been reported elsewhere [6][7]. A free-standing film was obtained [7] and was used to measure hydrogen concentration [8][9]. X-ray patterns showed that the Ni-P coating containing 11wt% P was amorphous as-deposited and became nanocrystalline after the treatment at 400°C for 2 h [6].…”

Section: Methodsmentioning

confidence: 99%

Effect of hydrogen on the friction and wear of Ni-P coatings

Zhou

Wuyang

2010

Int J Miner Metall Mater

View full text Add to dashboard Cite

The effects of charging and outgassing on the friction and wear of Ni-P amorphous and nanocrystalline coatings were studied under ambient humidity and temperature. The results indicate that hydrogen charging can greatly decrease the volume loss during friction and increase the wear durability. However, the wear durability can be restored after outgassing. There are many cracks on the brittle nanocrystalline before charging, and no crack appears after charging, but there are only a few cracks on the outgassed sample. This indicates that hydrogen charging can inhibit the crack formation during friction for the brittle Ni-P nanocrystalline. For the charged sample, after the surface layer was removed by polishing, the wear track and the friction coefficient are consistent with those of an uncharged sample. The friction coefficient of the charged amorphous coating is very small within the first 140 s and then increases suddenly to the value corresponding to the uncharged sample. The absorbed surface layer lubricates the surface, reduces the friction coefficient, and improves the wear durability.

show abstract

“…When hydrogen atoms combined in a defect or a tiny crack, they formed hydrogen molecules. The aggregation of hydrogen molecules increased the probability of colliding with the defective cavity [26]; thus, the hydrogen pressure caused by the hydrogen molecules promoted crack formation and expansion [27], as shown in Figure 4. The direction of the hydrogen pressure in the crack cavity was outward, and hydrogen pressure values were equal everywhere in the crack cavity.…”

Section: Mn Simentioning

confidence: 99%

“…On the contrary, when the material was only subjected to the hydrogen-pressure load without an external load, the calculation model was as shown in Figure 4. When the hydrogen content reaches a certain value, the tensile strength of the steel material is lowered to a level lower than the yield strength [27]. In this case, the mechanical model of steel materials changes from elastoplastic to linear elasticity.…”

Section: Effect Of Hydrogen Pressure According To Fe Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Fang

2018

Metals

View full text Add to dashboard Cite

A new criterion for hydrogen-induced cracking (HIC) that includes both the embrittlement effect and the loading effect of hydrogen was obtained theoretically. The surface cohesive energy and plastic deformation energy are reduced by hydrogen atoms at the interface; thus, the fracture toughness is reduced according to fracture mechanics theory. Both the pressure effect and the embrittlement effect mitigate the critical condition required for crack instability extension. During the crack instability expansion, the hydrogen in the material can be divided into two categories: hydrogen atoms surrounding the crack and hydrogen molecules in the crack cavity. The loading effect of hydrogen was verified by experiments, and the characterization methods for the stress intensity factor under hydrogen pressure in a linear elastic model and an elastoplastic model were analyzed using the finite-element simulation method. The hydrogen pressure due to the aggregation of hydrogen molecules inside the crack cavity regularly contributed to the stress intensity factor. The embrittlement of hydrogen was verified by electrolytic charging hydrogen experiments. According to the change in the atomic distribution during crack propagation in a molecular dynamics simulation, the transition from ductile to brittle fracture and the reduction in the fracture toughness were due to the formation of crack tip dislocation regions suppressed by hydrogen. The HIC formation mechanism is both the driving force of crack propagation due to the hydrogen gas pressure and the resisting force reduced by hydrogen atoms.

show abstract

Hydrogen blistering and hydrogen-induced cracking in amorphous nickel phosphorus coating

Cited by 15 publications

References 16 publications

Modifying the 316L stainless steel surface by an electrodeposition technique: towards high-performance electrodes for alkaline water electrolysis

Modifying the 316L stainless steel surface by an electrodeposition technique: towards high-performance electrodes for alkaline water electrolysis

Effect of hydrogen on the friction and wear of Ni-P coatings

Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Contact Info

Product

Resources

About