EIS study of lanthanide conversion coatings developed by thermal activation on Al-Mg alloys
Keywords:AA5083 alloy, Conversion coatings, Cerium, EIS test
Nowadays, a lot of anticorrosive treatments that can be used as alternative processes to Cr(IV)-based treatments are developing. Some of them involve the use of lanthanide compounds. The present work show a morphologic and anticorrosive study of conversion coatings developed on samples of AA5083 alloy from Ce (III) solutions, by treatments of immersion to 323K in baths of cerium salts. SEM/EDS analysis of treated sampled shows the existence of an heterogeneous coating composed of an aluminium hydroxide/oxide on the metallic matrix and Ce island over cathodic intermetallic. Protected with conversion coatings, AA5083 samples were immersed in NaCl and EIS tests were registered both to evaluate the protection degree of the developed coatings and to characterize the individual contribution of the electrochemical response of the system.
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