Characterization of rare-earth conversion films formed on the AZ31 magnesium alloy and its relation with corrosion protection
- 1. ICEMS, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon (Portugal)
- 2. ESTSetubal, Instituto Politecnico de Setubal, 2910 Setubal (Portugal)
Description
Two pre-treatments were studied for AZ31 Mg alloy substrates, consisting of immersion in cerium nitrate and lanthanum nitrate solutions for various immersion times. The surface composition was investigated by X-ray photoelectron spectroscopy and Auger electron spectroscopy that revealed the presence of a surface film containing the rare-earth cation, with a composition which was time dependent in the case of the cerium pre-treatment. The corrosion behaviour of the pre-treated substrates in 0.005 M NaCl solutions was assessed by potentiodynamic polarization, open circuit potential monitoring and the scanning vibrating electrode technique (SVET). The electrochemical results show that the pre-treatments reduced the corrosion activity of the AZ31 Mg alloy substrates in the presence of chloride ions. The corrosion protection efficiency is dependent on the treatment time
Additional details
Identifiers
- DOI
- 10.1016/j.apsusc.2007.02.019;
- PII
- S0169-4332(07)00220-6;
Publishing Information
- Journal Title
- Applied Surface Science
- Journal Volume
- 253
- Journal Issue
- 16
- Journal Page Range
- p. 6922-6931
- ISSN
- 0169-4332
- CODEN
- ASUSEE
Conference
- Title
- 4. international workshop on basic aspects of nonequilibrium plasmas interacting with surfaces - Negative ions, their function and designability; 4. EU-Japan joint symposium on plasma processes
- Dates
- 30 Jan - 1 Feb 2006
- Place
- Lake Kawaguchi (Japan)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39003111
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- AUGER ELECTRON SPECTROSCOPY; CATIONS; CERIUM; CERIUM NITRATES; CHLORINE IONS; CORROSION; CORROSION PROTECTION; FILMS; LANTHANUM NITRATES; MAGNESIUM; MAGNESIUM ALLOYS; MONITORING; POLARIZATION; RARE EARTHS; SODIUM CHLORIDES; SUBSTRATES; SURFACES; TIME DEPENDENCE; X-RAY PHOTOELECTRON SPECTROSCOPY
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALKALINE EARTH METALS; ALLOYS; CERIUM COMPOUNDS; CHARGED PARTICLES; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; ELECTRON SPECTROSCOPY; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; IONS; LANTHANUM COMPOUNDS; METALS; NITRATES; NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; RARE EARTH COMPOUNDS; RARE EARTHS; SODIUM COMPOUNDS; SPECTROSCOPY
Optional Information
- Copyright
- Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.