Crossover of interface growth dynamics during corrosion and passivation

Details Crossover of interface growth dynamics during corrosion and passivation Crossover of interface growth dynamics during corrosion and passivation

2006-09-18

arxiv.org/abs/cond-mat/0609428v1

Physics

Condensed Matter

Materials Science

17 pages, including 7 figures; submitted article

Scientific paper

10.1088/0953-8984/19/6/065125

We study a model of corrosion and passivation of a metalic surface in contact with a solution using scaling arguments and simulation. The passive layer is porous so that the metal surface is in contact with the solution. The volume excess of the products may suppress the access of the solution to the metal surface, but it is then restored by a diffusion mechanism. A metalic site in contact with the solution or with the porous layer can be passivated with rate p and volume excess diffuses with rate D. At small times, the corrosion front linearly grows in time, but the growth velocity shows a t^{-1/2} decrease after a crossover time of order t_c ~ D/p^2, where the average front height is of order h_c ~ D/p. A universal scaling relation between h/h_c and t/t_c is proposed and confirmed by simulation for 0.00005 <= p <= 0.5 in square lattices. The roughness of the corrosion front shows a crossover from Kardar-Parisi-Zhang scaling to Laplacian growth (diffusion-limited erosion - DLE) at t_c. The amplitudes of roughness scaling are obtained by the same kind of arguments as previously applied to other competitive growth models. The simulation results confirm their validity. Since the proposed model captures the essential ingredients of different corrosion processes, we also expect these universal features to appear in real systems.

Affiliated with

Also associated with

No associations

Rating

Crossover of interface growth dynamics during corrosion and passivation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Crossover of interface growth dynamics during corrosion and passivation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crossover of interface growth dynamics during corrosion and passivation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-647167