Materials Performance

MAY 2015

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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18 MAY 2015 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 54, NO. 5 MATERIAL MATTERS Apart from the localized thickness loss, corrosion pits can also be harmful by act- ing as stress risers. Fatigue and stress corrosion cracking (SCC) may initiate at the base of corrosion pits. One pit in a large system can be enough to produce the catastrophic failure of that system. The model essentially simulates two separate yet related processes. It f irst captures the corrosion that occurs via the migration of atoms (ions) at the interface of the pit and the undisturbed metal. It then calculates how this diminishing concentration of ions contributes to the deterioration of a structure's mechanical bonds, which are the physical linkages that help the material maintain its solid form. "Instead of just modeling what hap- pens in the solution, we're modeling the whole system—metal and solution," Bobaru says. Research by Ziguang Chen (left) and Florin Bobaru with the University of Nebraska–Lincoln has led to the creation of a new model that better predicts the effects of corrosion. Photo by Scott Schrage/University Communications. Continued f rom page 17

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