Fig. 4 | npj Materials Degradation

Fig. 4

From: Utilization of chemical stability diagrams for improved understanding of electrochemical systems: evolution of solution chemistry towards equilibrium

Fig. 4

Chemical stability diagram depicting the effect of initial solution chemistry (✦) on the trajectory and final equilibrium condition (●) of a corroding Mg system. It is seen that Mg2+/Mg(OH)2 equilibrium (line 8.1) is reached under two different conditions. The presence of a pH buffering agent drastically shifts the conditions of final equilibrium as indicated by lines 3 and 9. Buffering agents have the effect of increasing the amount of metal ion production (line 3) required to increase the pH by the same amount as an unbuffered solution (line 9)

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