Abstract
The corrosion resistance, adhesion and morphology of the chromate conversion coating (CCCs) formed on AA6061 in a chromate conversion solution containing mainly potassium dichromate (K 2Cr 2O 7), chromic anhydride (CrO 3) and sodium fluoride (NaF), using cerium chloride (CeCl 3) as additive, were investigated by using potentiodynamic polarization curves, EIS, adhesion test and SEM. The corrosion resistance and adhesion of the CCCs are improved greatly by adding a small amount of CeCl 3 (from 20 to 40 mg/L), whereas the excessive CeCl 3 (60 mg/L) deteriorates these properties of the CCCs. The results of polarization curves are in good agreement with those of EIS. SEM photographs show that the precipitation of cerium hydroxide significantly affects the morphologies of CCCs.
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