Effect of environmental relative humidity on hydrogen-induced mechanical degradation in an Al–Zn–Mg–Cu alloy

Safyari, Mahdieh; Hojo, Tomohiko; Moshtaghi, Masoud

doi:10.1016/j.vacuum.2021.110489

Cited by 30 publications

(26 citation statements)

References 30 publications

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“…The oxygen molecules existed in solution because no deaeration (not bubbling with argon or pure nitrogen) was performed. It is possible to have a certain amount of absorbed reactive atomic hydrogen produced by the humidity in the environment [ 44 , 45 ], as discussed in the Introduction.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, Al alloys may take up hydrogen during their processing and use, and the absorbed hydrogen is transported into the alloy and may be trapped at different preferred sites. Some researchers have reported, very recently, that during the formation of the protective oxide layer on the surface of commercial aluminum alloys, the crack growth is enhanced [ 44 , 45 ] due to absorption of reactive atomic hydrogen produced by the humidity from the environment. The electrochemical process is: H 2 O + e − → OH − + H abs .…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Corrosion of Carbon Steel and Aluminum Alloy in Firefighting Protein Foam Concentrates

Patrascu

Busuioc²,

Busuioc

et al. 2021

Materials

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The corrosion of mild steel and Al alloy in Fomtec P 6% and 6% P Profoam 806 protein-based foam concentrates was investigated. Weight-loss data for steel showed corrosion penetration of 0.745 mipy in Fomtec and 2.269 mipy in Profoam, whereas for Al alloy the penetration levels were 0.474 and 1.093 mipy, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy allowed characterization of the metallic surface covered or free from corrosion products. Values of corrosion potential, corrosion current density and corrosion penetration were calculated by using potentiodynamic polarization curves. Electrochemical impedance spectra illustrated the change in polarization resistance during anodic polarization. Data obtained by accelerated electrochemical methods confirm the greater aggressiveness of the Profoam concentrate compared to Fomtec concentrate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Corrosion of Carbon Steel and Aluminum Alloy in Firefighting Protein Foam Concentrates

Patrascu

Busuioc²,

Busuioc

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…The relationship between relative humidity and metallurgical engineering is also very close. The effect of RH on the production process of aluminum alloys was highlighted in the study conducted by Safyari et al As a result of the research, cracks can form in aluminum alloys when relative humidity is high, and relative humidity should be kept under control during the manufacturing process (Safyari et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Daily average relative humidity forecasting with LSTM neural network and ANFIS approaches

Özbek

Ünal

Bilgili

2022

Theor Appl Climatol

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Because hurricanes, droughts, oods, and heat waves are all important factors in measuring environmental changes, they can all result from changes in atmospheric air temperature and relative humidity (RH). Besides, climate, weather, industry, human health, and plant growth are all affected by RH.Accurately and consistently forecasting RH is a challenge due to its non-linear nature. The present study tried to predict one day ahead of RH in determined provinces from different climatic regions of Turkey (Ankara, Erzurum, Samsun, Diyarbakır, Antalya, and Bilecik) using long short-term memory (LSTM) and adaptive neuro-fuzzy inference system (ANFIS) with fuzzy c-means (FCM) based machine learning models. As evaluation criteria, root mean square error (RMSE), mean absolute error (MAE), and correlation coe cient (R) were employed. The outcomes from the forecasting models were also validated using observed data. During the testing stage, the smallest MAE and RMSE values were discovered to be 5.76% and 7.51%, respectively, in Erzurum province, with an R-value of 0.892 when using the LSTM method.Moreover, the smallest MAE and RMSE values were obtained to be 5.95% and 7.67% respectively, in Erzurum province with an R-value of 0.887 using the ANFIS model according to the hourly RH prediction.The results indicate that both the LSTM and ANFIS approaches performed well in daily RH prediction, with the LSTM and ANFIS approaches producing nearly identical results.

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“…The TDS technique is used for the purpose of studying the behavior of hydrogen released during isothermal heating. In previous studies, the TDS technique was mentioned as the most reliable technique for hydrogen analysis [10,11]. Enomoto, M. shows the reliability of the TDS method, and its finite difference code was developed to simulate the result of TDS analysis from the steel plate with martensite (or ferrite) and austenite phases [12].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption and Desorption Behavior on Aluminum-Coated Hot-Stamped Boron Steel during Hot Press Forming and Automotive Manufacturing Processes

Kim

Jung

et al. 2021

Materials

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Our study mainly focused on diffusible hydrogen in aluminum–silicon-coated hot-stamped boron steel during a hot press forming process and in pre-treatment sequential lines of the automotive manufacturing process using a thermal desorption spectroscopy (TDS) technique. First, in the hot stamping procedure, as the soaking time increased in the heating furnace at a specific dew point when austenitizing, a high concentration of diffusible hydrogen was absorbed into the hot-stamped boron steel. Based on the TDS analysis of hydrogen absorbed from hot stamping, the activation energy value of hydrogen trapping in 1.8 GPa grade steel is lower than that of 1.5 GPa grade steel. This means that diffusible hydrogen can be more easily diffused into defective sites of the microstructure at a higher level of the tensile strength grade. Second, in sequential pre-treatment lines of the automotive manufacturing process, additional hydrogen did not flow into the surface, and an electro-deposition process, including a baking procedure, was effective in removing diffusible hydrogen, which was similar to the residual hydrogen of the as-received state (i.e., initial cold rolled blank). Based on these results, the hydrogen absorption was facilitated during hot press forming, but the hydrogen was sequentially desorbed during automotive sequential lines on aluminum-coated hot-stamped steel parts.

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Effect of environmental relative humidity on hydrogen-induced mechanical degradation in an Al–Zn–Mg–Cu alloy

Cited by 30 publications

References 30 publications

Experimental Study on the Corrosion of Carbon Steel and Aluminum Alloy in Firefighting Protein Foam Concentrates

Experimental Study on the Corrosion of Carbon Steel and Aluminum Alloy in Firefighting Protein Foam Concentrates

Daily average relative humidity forecasting with LSTM neural network and ANFIS approaches

Hydrogen Absorption and Desorption Behavior on Aluminum-Coated Hot-Stamped Boron Steel during Hot Press Forming and Automotive Manufacturing Processes

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