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1
Strain induced up-hill diffusion of hydrogen in Al
100%
Łunarska E. , Chernyayeva O.
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tom R. XXV, nr 3
I-IV
EN
During the hydrogen permeation through Al in 0.01N NaOH, the unusual kinetic of hydrogen permeation has been observed. The formation of the minimum of hydrogen permeation rate and the maximum of hydrogen permeation rate has been noticed upon the appplication and cessation of cathodic polarization, respectively. The effect of the near electrode pH of electrolyte and of the electrode potential on permeation transients suggested that the reason for untypical hydrogen permeation was not the surface effects but the complex transport of hydrogen within the membrane. The effect of the Al membrane thickness on permeation transients and the effect of cathodic polarization on the stress-strain curve of Al and the results olf theoretical calculations showed that the strain introduced into the membrane at application of cathodic polarization caused the hydrogen up-hill diffusion. The possibility of the hydrogen up-hill diffusion should be taken into account at consideration of stress and strain state at the tip of propagated corrosion crack in Al.
PL
W procesie elektrochemicznych pomiarów przenikania wodoru przez Al w 0.01N NaOH zaobserwowano nietypowy przebieg krzywej przenikania wodoru. Zarejestrowano minimum przenikania wodoru przy włączeniu polaryzacji katodowej, oraz maksimum przenikania przy wyłączeniu polaryzacji katodowej. Wpływ przyelektrodowego pH roztworu i potencjału elektrody na przebieg krzywych przenikania wodoru wskazuje na to, że przyczyną nietypowego przebiegu przenikania nie są procesy powierzchniowe, lecz złożony transport wodoru wewnątrz membrany. Wpływ grubości membrany Al na przenikanie wodoru, wpływ polaryzacji katodowej na krzywą rozciągania Al i wyniki teoretycznych obliczeń wskazują, że naprężenia wprowadzane do membrany przy nałożeniu polaryzacji katodowej wywołują wsteczną dyfuzję wodoru. Możliwość wstecznej dyfuzji powinna być brana pod uwagę przy rozpatrywaniu stanu naprężeń i odkształceń w wierzchołku pęknięcia korozyjnego rozprzestrzeniającego się w Al.
2
Content available remote Effects of hydrogen induced elastic and plastic straining on its transport in Al
100%
Łunarska E. , Chernyayeva O.
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tom Vol. 7, nr 1(11)
153-159
EN
Hydrogen entering at cathodic polarization produces the straining of Al. In the course of increased polarization, the elastic strain causing the up-hill diffusion of hydrogen present in metal and then the plastic deformation creating of hydrogen traps have been introduced. As a result, the unusual appearance of hydrogen permeation transients and the retardation of hydrogen transport and its accumulation within the plastically deformed metal occur at the low and at the high polarization, respectively. The supersaturation of surface layers with hydrogen or the formation of the patchy hydride like layer have been discussed to be the source of the observed metal straining.
3
Content available remote Pecularities of the shear modulus and deformation response in Al-H system
100%
Spivak L. , Łunarska E.
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tom Vol. 7, nr 1(11)
191-197
EN
The change of the shear modulus of annealed and deformed Al due to the hydrogen ingress bas been shown to be stable at heating up to 1800 C and at ageing at RT. Hydrogen charging caused the active deformation of samples being under the creep condition, which continued even after the cessation of the hydrogen charging. The estimated activation volume of the hydrogen initiated creep depended on the mode of the initial deformation (elastic OT plastic). The obtained peculiar results cannot be fully explained and the formation of some transient stale preceding the hydride phase formation bas been supposed.
4
Content available remote Effect of steel microstructure on bacteria-assisted hydrogen effects at cathodic polarization in sea water
80%
Łunarska E. , Domżalicki P. , Birn J.
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tom Vol. 7, nr 1(11)
160-165
EN
The effect of the SRB action on mechanical properties and hydrogen uptake by the steels of quite similar chemical composition but different microstructure bas been studied at cathodic polarization in synthetic sea water. Susceptibility of sorbite steel to the SRB action, as seen from the plasticity los s and hydrogen uptake was higher than that of ferrite-pearlite steels. The sorbite steel revealed also the highest polarization current, highest amount of S.2 in solution and the highest amount of S on the surface of metal tested in the presence of SRB. The made pronounced detrimental effect of SRB produced on sorbite steel was mostly accounted for the presence of Mn, Fe sulfides in the steel microstructure.
5
Content available remote Corrosion and hydrogen intake for some Cr-Mn steels in liquid hydrocarbons
80%
Świeczko-Żurek B. , Łunarska E. , Zieliński A.
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tom Vol. 7, nr 1(11)
198-204
EN
The 26H2MF and 34HNM alloy steel were investigated. The corrosion and hydrogen absorption were measured. The boiler fuel and used mineral oil were used as aggressive environments, and glycerin as an inert environment. The results of corrosion studies made with potentiodynamic and impedance techniques on the 26H2MF alloy steel showed substantial difference of corrosion rate in sulfuric acid and in boiler fuel. The surface degradation and hydrogen intake were also different in boiler fuel and in used mineral oil. The results were explained by effects of different chemical environments.
6
Struktura i właściwości warstw kompozytowych typy Al2O3 + AIN wytworzonych na podłożu Niklu 200 metodą PACVD z użyciem trimetyloglinu
71%
Sitek R. , Sikorski K. , Pisarek M. , Łunarska E. , Wierzchoń T.
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tom Z. 82
197-205
PL
W artykule przedstawiono wyniki badań struktury i składu chemicznego warstw Al2O3, Al2O3 + AlN otrzymanych na podłożach wykonanych z Niklu 200 metodą PACVD z użyciem związku metaloorganicznego trimetyloglinu. Warstwy te charakteryzuje duża twardość, wysoka odporność na ścieranie, chemiczna stabilność. Stosowano następujące techniki badawcze: mikroskopia świetlna SEM + EDS, AES, XRD, badania mikrotwardości, badania korozyjne.
EN
The structure and chemical composition of composite oxynitrided layers obtained on Nickel 200 by PACVD method using metaloorganic compound (trimethylaluminium Al(CH3)3) are described. X-ray microanalysis examinations, confirmed by X-ray diffraction and Auger electron spectroscopy, shows that obtained layer contains Al2O3 and AlN phases.The obtained layer shows high hardness (1300 HV0,05) and good corrosion resistance.
7
Content available remote Hydrogen permeation through welded joints of S690QL steels at cathodic polarisation in sea water in the presence of SRB
71%
Brin J. , Domżalicki P. , Łunarska E. , Narożniak-Łuksza A. , Zieliński A.
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tom Vol. 7, nr 1(11)
100-106
EN
The paper presents results of investigations performed by Devanatban-Stacbursky method of hydrogen permeation in sea water with sulphate reducing bacteria and for comparison in sterile conditions. The investigations were carried out for specimens of S690QL steel subjected to beat treatment simulating welding process and producing structures corresponding to structures occurring in beat affected zone. Cooling time in the range of temperature 800 - 500°C was 20, 60 and 100 s. Higher hydrogen concentration on the entry side of the specimen for all variants of welding beat cycles simulation was found in the presence of bacteria than in sterile conditions. In these last conditions differences between particular specimens are minimal especially in potential limits from +100 to -300 mV vs. Zinc electrode.
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