Lanthanide salts as corrosion inhibitors for AA5083. Mechanism and efficiency of corrosion inhibition

authors	Yasakau, KA; Zheludkevich, ML; Ferreira, MGS
nationality	International
journal	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
keywords	PROBE FORCE MICROSCOPY; ALUMINUM-ALLOY; ATOMIC-FORCE; CERIUM; AA2024-T3; AL-5083; ADDITIONS; NACL
abstract	The inhibition effect of trivalent lanthanide (Ce3+, La3+) cations toward the localized corrosion of 5083 aluminum alloy in chloride-containing solutions was investigated in the present work. Electrochemical impedance spectroscopy was employed to estimate the inhibition efficiency of the lanthanide species under study. Scanning Kelvin probe force microscopy was used to provide deeper understanding of the corrosion and inhibition mechanisms at the micro level. The results of electrochemical tests demonstrate effective hindering of the localized corrosion attack due to precipitation of highly insoluble deposits on cathodic intermetallics. Trivalent lanthanum cations confer a more effective corrosion inhibition in comparison to that of Ce3+. Superior inhibition of La3+ resulted from the formation of very dense hydroxide domes while cerium-based precipitates have a porous granulated structure. (c) 2008 The Electrochemical Society.
publisher	ELECTROCHEMICAL SOC INC
issn	0013-4651
year published	2008
volume	155
issue	5
beginning page	C169
ending page	C177
digital object identifier (doi)	10.1149/1.2844341
web of science category	Electrochemistry; Materials Science, Coatings & Films
subject category	Electrochemistry; Materials Science
unique article identifier	WOS:000254779700019