Characterisation of unsealed anodic oxide layers on aluminium

Autor:	E.P.M. van Westing, J.H.W. de Wit, M. B. Spoelstra
Rok vydání:	2001
Předmět:	Mechanical Engineering Metallurgy Metals and Alloys chemistry.chemical_element General Medicine Electrochemistry Surfaces Coatings and Films Corrosion Barrier layer chemistry Mechanics of Materials Aluminium Materials Chemistry Environmental Chemistry Porous layer Anodic oxide
Zdroj:	Materials and Corrosion. 52:661-666
ISSN:	1521-4176 0947-5117
DOI:	10.1002/1521-4176(200109)52:9<661::aid-maco661>3.0.co;2-4
Popis:	The inhibiting effect of unsealed anodic oxide layers on filiform corrosion (FFC) was studied. This was done by means of impedance measurements, polarisation measurements and accelerated corrosion tests (Lockheed test). The electrochemical measurements indicate that both the porous layer and the barrier layer contribute to an enhanced corrosion resistance. In the Lockheed test, the specimens with a porous layer, did not show FFC. The specimens with a barrier layer revealed first a decrease of the number of filaments but after a certain point it increased. In contrast to this, the corroded area of the filaments showed a gradual decrease with increasing barrier layer thickness.
Databáze:	OpenAIRE
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