Fig. 7: Schematic diagrams of the PPI corrosion mechanisms. | npj Materials Degradation

Fig. 7: Schematic diagrams of the PPI corrosion mechanisms.

From: Particle-particle interface corrosion of cold sprayed copper in dilute nitric acid solutions: geometry-controlled corrosion mechanism

Fig. 7

a The PPI corrosion mechanism for CS Cu in HNO3; b simplified models showing the diffusion pathways for species under different geometrical conditions; the corrosion process for c LT, and d HT CS Cu. Arrows in a III indicate the corrosion propagation caused by the ORR (green) and catalytic cycles (blue). Arrows in b represent possible diffusion directions, with the purple and black ones denoting directions into the bulk solution and to the Cu surface, respectively.

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