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- W2078758527 abstract "Abstract A cell is described which provides a means of studying the permeation of hydrogen through steel at elevated pressures. It has been shown that the significant factor in permeation is the partial pressure of hydrogen, pH2, and not the applied pressure, P, and that reproducible results can be obtained provided the solution is agitated so that the hydrogen generated cathodically is dispersed into the bulk solution. The permeation of hydrogen through steel has been studied in 0.1 mol dm−3 NaOH and in 0.05 mol dm−3 H2SO4 under conditions of constant current density and applied pressure and at various constant partial pressures of hydrogen, and it has been shown that in all cases (∂J/∂pH2) > 0. In 0.1 mol dm−3 NaOH linear J vs i 1 2 and J vs pH2 relationships have been observed, whereas in 0.05 mol dm−3 H2SO4 although J vs i 1 2 is linear at low current densities the curves follow linear J vs log i and J vs log pH2 relationships at higher current densities. The results in NaOH and H2SO4 have been explained in terms of the effect of pH2 on the rate constants k2, k−2 of the chemical desorption step of the h.e.r. A decrease in k2 and an increase in k2 will increase the coverage, θH, with a consequent increase in the rate of permeation. The effect of pH2 on permeation may be of significance in systems where the steel is enclosed so that hydrogen is discharged cathodically at high partial pressures, e.g. high-strength steels used for reinforcing bars and prestressing cables in concrete, which are adventitiously connected to a cathodic protection system." @default.
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- W2078758527 date "1977-01-01" @default.
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- W2078758527 title "The effect of pressure on the permeation of hydrogen through steel" @default.
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- W2078758527 doi "https://doi.org/10.1016/0010-938x(77)90005-1" @default.
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