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Simulation of Solution Chemistry in Crevice Corrosion for Stainless Steel

When the salt of CrCl3•6H2O is dissolved in the water, in most cases, the ions of CrCl and Cr exist in the solution. The CrCl3 solution was left at rest for 500h to reach to the equilibrium condition, and then the concentration of Cl ion, [Cl], were measured by Ag/AgCl electrode. The ratio of t, t=[CrCl2]/[CrCl3], was determined as t=3-[Cl]/[CrCl3]. Based on the relationship between t and [CrCl3], the equilibrium constant, K2, for Cr + Cl => CrCl , K2=[CrCl2]/[ Cr][ Cl] was determined as K2=2.75.