Hydrogen-straining effects in Al

The formation of the transition hydrogen permeation minimum and maximum upon the application and cessation of cathodic polarization of Al in 0.01N NaOH has been accounted for the strain induced hydrogen uphill diffusion. The straining of Al due to the cathodic polarization has been confirmed by the effect of cathodic polarization on the stress-strain and creep relationships and on the Al elastic modulus evaluated by means of the internal friction measurements. The role of the Al hydride formation has been discussed.