Effect of Surface Conditions and Relative Humidity on Hydrogen Permeation Behavior of Zinc Coated Steels during Wet and Dry Corrosion

Sakairi, Masatoshi; Takagi, Shigeaki

doi:10.2355/isijinternational.isijint-2015-247

Cited by 16 publications

(6 citation statements)

References 25 publications

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“…There have been the researches that tried to measure hydrogen absorption rate of polished steels during atmospheric corrosion in air open conditions and revealed enhancement of hydrogen absorption at higher temperature and at optimum humidity. [14][15][16][17] Our research group has, on the other hand, focused on hydrogen absorption into the steels with rust layer containing salt during atmospheric corrosion, and investigated the relationship between hydrogen absorption rate and relative humidity (RH) of air at the room temperature using an Fe plate with the rust layer containing NaCl 18) or MgCl 2 . 19) As brief results, the hydrogen absorption rate had one and two peaks against RH for NaCl and MgCl 2 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption into Fe Plates with Rust Layers Containing Various MgCl2 Amounts during Atmospheric Corrosion with Controlled Humidity

2021

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Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption into Fe Plates with Rust Layers Containing Various MgCl2 Amounts during Atmospheric Corrosion with Controlled Humidity

2021

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“…Their results revealed that Na 2 SO 3 decreased the pH and corrosion potential, thus, it enhanced hydrogen absorption. Tada and Miura, 12) as well as Sakairi and Takagi 13) investigated the hydrogen absorption in Zn-plated steel during a dry-wet cyclic corrosion test after dropping NaCl and Na 2 SO 4 solutions on the steel surfaces. They observed hydrogen absorption when Zn-plate was locally destroyed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Humidity of Air on Hydrogen Absorption into Fe with Rust Layer Containing MgCl2 during Atmospheric Corrosion

2021

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An Fe plate, whose one side was electro-polished and the other covered with the rust layer containing 25.7 g•m − 2 MgCl 2 , was used as the specimen to investigate the effect of humidity on the hydrogen absorption of the plate. The specimen was subjected to an electrochemical hydrogen-absorption test during which the rusted surface was exposed to the air with controlled relative humidity (RH) and atmospheric corrosion occurred on it. When the rusted surface was subjected to dry (RH 0%)-wet (RH 27%) repeated cycle tests for 10.8 ks each, the anodic current density corresponding to the hydrogen-absorption rate was measured on the hydrogen detection surface. The maximum current density was almost independent of the cycle during the first 10 cycles, after which it decreased with an increase in the cycle, reaching almost a steady-state after about 40 cycles. After 55 cycles of the dry-wet repeated cycle test, the specimen was subjected to an electrochemical hydrogen-absorption test to obtain the relationship between the steadystate hydrogen-absorption rate and RH. Hydrogen absorption was observed at RH of about 15%, and the absorption rate increased rapidly with an increase in RH, reached a maximum at RH of about 30%, and then decreased rapidly. When RH increased beyond 40%, the absorption rate increased again, reached a maximum value at RH of 80%, and then decreased gradually. The specimen with the rust layer containing 39.8 g•m − 2 MgCl 2 also showed two peaks in the hydrogen-absorption rate versus RH plot.

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“…[2][3][4] Therefore, several studies on investigating the interactions of hydrogen with steels were conducted to understand the mechanism of hydrogen embrittlement. [5][6][7][8] Atmospheric corrosion is the most prevalent type of corrosion for steels and is considered to be an important source of diffusible hydrogen. [9][10][11][12] When steels are used under atmospheric conditions, hygroscopic salts such as NaCl and MgCl 2 tend to form thin electrolyte films on the steel surface when a critical relative humidity level is reached.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeation Behavior of Steel under Wet/dry Corrosion with Changes in Relative Humidity at the Dry Period

Han

Sakairi

2021

ISIJ Int.

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Wet/dry cyclic corrosion tests were conducted to investigate the effect of relative humidity (RH) at dry periods on the hydrogen permeation behavior of steel. Steel specimens were exposed to a temperature and humidity-controlled environment with an initial placement of NaCl droplet. The RH at the dry period was controlled at 20%, 55%, 60%, and 65%, which was lower than the deliquescence RH of NaCl (75%). Hydrogen permeation current was detected using electrochemical methods. The corrosion process on the steel was observed using optical techniques. The results show that the amount of permeated hydrogen through the steel increases with increasing RH at the dry period from 20% to 65%. The hydrogen evolution reaction is inhibited with the accumulation of corrosion products on the steel surface, resulting in a decrease in the amount of permeated hydrogen. Based on the results, the state of NaCl inside corrosion products is supposed to be a solid phase at 20% RH, a liquid-solid phase at 55% RH, and a liquid-rich phase above 60% RH. The increasing volume of the liquid phase contributes to the rise in the amount of permeated hydrogen at the dry period.

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Effect of Surface Conditions and Relative Humidity on Hydrogen Permeation Behavior of Zinc Coated Steels during Wet and Dry Corrosion

Cited by 16 publications

References 25 publications

Hydrogen Absorption into Fe Plates with Rust Layers Containing Various MgCl<sub>2</sub> Amounts during Atmospheric Corrosion with Controlled Humidity

Hydrogen Absorption into Fe Plates with Rust Layers Containing Various MgCl<sub>2</sub> Amounts during Atmospheric Corrosion with Controlled Humidity

Effect of Humidity of Air on Hydrogen Absorption into Fe with Rust Layer Containing MgCl<sub>2</sub> during Atmospheric Corrosion

Hydrogen Permeation Behavior of Steel under Wet/dry Corrosion with Changes in Relative Humidity at the Dry Period

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