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The combination of a lower acetate concentration (0.4 g/L) and acidification with HCl rather than acetic acid leads to a significantly reduced concentration of acetic acid in Test Solution C when compared with Test Solution B. Although this may be adequate for maintaining the bulk solution pH constant when testing corrosion-resistant alloys, the ability to resist an increase in pH at the metal-solution interface by dissociation of the acetic acid is lowered.
As the tests are conducted with little convective flow, it is possible that the pH at the surface increases slightly, and for conditions on the borderline between active and passive behavior, this may lead to passivity, giving a nonconservative result. Bulk solution pH measurements do not necessarily indicate any limitation in the buffer capacity as the pH change is highly localized.

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