Effect of SO42- on the corrosion behavior of cerium-based conversion coatings on galvanized steel
Creators
- 1. Department of Electronic Materials, Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553 (Japan)
Description
The cerium-based conversion coatings on galvanized steel were investigated and the influence of SO42- on the corrosion behavior was evaluated. The coatings were prepared by a simple immersion of galvanized steels in an aqueous solution composed of cerium nitrate and sodium sulfate. The corrosion behavior was studied by means of potentiodynamic polarization measurements and neutral salt spray tests. The addition of SO42- to the coating solution considerably improved the corrosion resistance of the conversion coatings. Atomic force microscope observation shows that deposits prepared from the solution with SO42- have smaller crystalline size than those prepared without SO42-. The results of X-ray photoelectron spectroscopy and titration curves demonstrate that SO42- ions are incorporated in the coating during the conversion process. This indicates that SO42- acts as a grain refiner and/or growth inhibitor, thus enhancing the corrosion resistance
Additional details
Identifiers
- DOI
- 10.1016/j.electacta.2005.11.043;
- PII
- S0013-4686(05)01378-2;
Publishing Information
- Journal Title
- Electrochimica Acta
- Journal Volume
- 51
- Journal Issue
- 20
- Journal Page Range
- p. 4236-4242
- ISSN
- 0013-4686
- CODEN
- ELCAAV
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38016359
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- AQUEOUS SOLUTIONS; ATOMIC FORCE MICROSCOPY; CERIUM; CERIUM NITRATES; CORROSION; CORROSION PROTECTION; CORROSION RESISTANCE; ELECTRODEPOSITED COATINGS; POLARIZATION; SODIUM SULFATES; SPRAYS; STEELS; TITRATION; X-RAY PHOTOELECTRON SPECTROSCOPY
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALLOYS; CARBON ADDITIONS; CERIUM COMPOUNDS; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COATINGS; DISPERSIONS; ELECTRON SPECTROSCOPY; ELEMENTS; HOMOGENEOUS MIXTURES; IRON ALLOYS; IRON BASE ALLOYS; METALS; MICROSCOPY; MIXTURES; NITRATES; NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; QUANTITATIVE CHEMICAL ANALYSIS; RARE EARTH COMPOUNDS; RARE EARTHS; SODIUM COMPOUNDS; SOLUTIONS; SPECTROSCOPY; SULFATES; SULFUR COMPOUNDS; TRANSITION ELEMENT ALLOYS; VOLUMETRIC ANALYSIS
Optional Information
- Copyright
- Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.