1142 Concentration Temperature and Solution Velocity

In general, increasing concentration of reactive species leads to an increase in the corrosion rate. For example, increasing the hydrogen ion concentration of a solution, that is, decreasing the pH, causes an increase in corrosion rate. However, where solution chemistry can lead to the formation of a passive film, that is, oxidizing acids such as nitric acid, a decrease in corrosion rate can occur.

TABLE 11.2 Typical Composition of Seawater



Concentration (g/kg)



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