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Hydrogen surface smoothing effect

Smooth Pt and Rh electrodes have been compared [105, 269] with electrodepos-ited layers to investigate the effect of roughness (which may be of the order of 103). While electrodeposited Pt absorbs hydrogen and bright Pt does not, no surface area effect has been observed as for hydrogen evolution. This indicates that the internal surface (pores) of rough electrodes does not work because of exclusion due to gas formation. Thus, the porosity of the active layers also needs to be characterized. It has been shown that in the case of Raney Ni [270] this can be conveniently done by means of impedance measurements [271]. [Pg.23]

In such reactions as the tarnishing of silver in air, the oxidation of aluminum in air, or attack of lead in sulfate-containing environments, thin, tightly adherent protective films are formed, and the metal surface remains smooth. It should be mentioned that underground corrosion is frequently observed as localized corrosion. Oxidation, sulfidation, carburization, hydrogen effects, and hot corrosion can be considered as types of general corrosion.20... [Pg.340]

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See also in sourсe #XX -- [ Pg.79 ]



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