Surface segregation induced by chemisorption at the alloy/solution interface

CO-Induced Segregation of Hydrogen into the Subsurface on Ni(110)

“…Surface segregation behavior was further corroborated theoretically by Poon and co-workers, who showed that the Au 3 Cu alloy, which initially has a Au-rich top layer and a Cu-rich second layer, becomes Cu-rich in the presence of a monolayer of oxygen . Finally, a study with the chemisorption of oxygen on Au−Ag vacuum-deposited alloy films has shown oxygen to induce changes to the I−E profiles during the initial potential scans, leading Lazarescu et al to suggest the oxygen-induced segregation of Ag into the bulk …”

“…14 Finally, a study with the chemisorption of oxygen on Au-Ag vacuumdeposited alloy films has shown oxygen to induce changes to the I-E profiles during the initial potential scans, leading Lazarescu et al to suggest the oxygen-induced segregation of Ag into the bulk. 15 Subsurface hydrogen has been identified on the Ni(111) and Cu(110) surfaces. On Ni(111), Ceyer et al used TPD measurements to show that a surface obtained via exposure to hydrogen atoms exhibits over 8 MLs of hydrogen desorbing from the subsurface with temperature.…”

Adsorption, Thermodynamic, and Experimental Studies of Corrosion Inhibitor of Tin in 0.2 M Maleic Acid by Hydrogen Phosphate Ions (HPO42−)

“…A comparison of the activation energies obtained in the presence (E a(inh) ) and the absence (E a ) of the inhibitor indicates that E a(inh) >E a , which is a proof that the HPO 4 2− ions protect the Sn by adsorbing on the surface via electrostatic interactions. Nevertheless, this kind of temperature‐sensitive bonding does not offer effective protection against corrosion at higher temperatures, as reported in the literature [25]. The increase of activation energy due to the use of inhibitor leads to a decrease in the corrosion rate of the tin metal.…”