Abstract
A growth model is proposed to simulate the pit formation in pitting corrosion of binary alloys. The metal is modeled by a random binary alloy where one species is easy to dissolve and the other species is hard to dissolve. The pit growth model is described by the anti-diffusion-limited aggregation model. A computer simulation is performed to form the corrosion pit in two dimensions for various composition ratios. It is shown that at the percolation threshold, a structure transition of the corrosion pit occurs between the diffusion-limited corrosion and the dissolution-limited corrosion. Above the percolation threshold of easily dissolving species, the pitting corrosion is controlled by the diffusion of anions and the width w of the pit scales as w\ensuremath{\approxeq}${\mathit{h}}^{1.86\ifmmode\pm\else\textpm\fi{}0.05}$ where h is the depth of the pit. Below the percolation threshold, the pitting corrosion is controlled by dissolution of metal and the width w of the pit is proportional to the depth h of the pit.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical review. A, Atomic, molecular, and optical physics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
