MORPHOLOGICAL ASPECTS OF ANODIC-DISSOLUTION

We have implemented the solid-on-solid (SOS) kinetic model in the fram ework of electrochemistry to study the evolution of surface morphology during driven metal dissolution. Our results show that the surface ro ughens with increasing applied electrical potential, as demonstrated b y the increase of the interface width and of the surface high-frequenc y-power spectrum. An abrupt change on the roughness is observed at a c ertain value of the applied potential, which indicates the possibility of an electrochemically driven kinetic-roughening transition. A chang e in the dissolution mechanism is proposed from a regime of kink propa gation at steps to a situation where low-coordination sites participat e just as actively in the dissolution process.