The underpotential deposition (UPD) of metals on defined metal single crystal surfaces represents a relatively new field of investigations. In this paper, the latest theoretical and experimental results in this topic are summarized with respect to the thermodynamic, kinetic and structural properties of UPD submonolayers and monolayers. Furthermore, surface reconstruction phenomena, alloy formation, interrelation between UPD and electrocrystallization, electrocatalytic effects caused by UPD, and optical results are discussed. It is mentioned that UPD represents a special case for initial steps in phase formation processes in heterogeneous systems.

Underpotential Metal Deposition on Single Crystal Surfaces

Anodic oxidation of valve metals, particularly, aluminum, has attracted considerable attention because of its wide application in various fields of technology. Traditionally, aluminum is “anodized” in order to protect the metal against corrosion, to improve its abrasion and adsorption properties, etc.1 The more recent and rapidly growing applications of anodic aluminas in electronics are due to their excellent dielectric properties, perfect planarity, and good reproducibility in production. Finally, ways have recently been found to use the energy potential of aluminum oxidation for chemical power sources of the metal-air type2,3 and other electrochemical applications.

G. Lafranconi

Papers

The inhibiting action of Pb2+ on stress corrosion cracking of austenitic stainless steels in acidic chloride media