Abstract
Various oxide films have been grown on AZ31 magnesium alloy by microarc oxidation in alkaline phosphate solution with addition of different compounds (Na2SiO3, NaAlO2). Because of the anodic oxide porosity, arising from the sparking treatment, organo-functional silane coatings have been applied to seal pores and cracks and achieve a more effective protective system. The surface and cross-section morphologies of the anodic films were analysed by scanning electron microscopy. The phase composition was determined by X-ray diffraction. Bare and anodised AZ31 specimens were post-treated with silanes, namely N-phenil-3-aminopropyltrimethoxysilane and Bis (trimethoxysilylethyl) benzene. The corrosion resistance of anodic oxides and oxide-silane composite coatings was evaluated in dilute Harrison solution by means of single-cycle anodic polarisation. The results showed that the addition of different salts to the alkaline phosphate solution affects the surface morphology and the phase composition of the coatings and, as a consequence, the corrosion resistance behaviour. Both silane post-treatments provide further corrosion protection to samples anodised in aluminate containing solution.
| Original language | English |
|---|---|
| Pages (from-to) | 275-280 |
| Number of pages | 6 |
| Journal | Transactions of the Institute of Metal Finishing |
| Volume | 91 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Sep 2013 |
| Externally published | Yes |
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Keywords
- Corrosion resistance
- Magnesium alloys
- Microarc oxidation
- Silane based coatings
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Mechanics of Materials
- Metals and Alloys
- Surfaces, Coatings and Films
Cite this
Properties of oxide-silane composite coating on AZ31 magnesium alloy. / Da Forno, A.; Bestetti, M.; Trasatti, S. P.; Trueba, M.
In: Transactions of the Institute of Metal Finishing, Vol. 91, No. 5, 09.2013, p. 275-280.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Properties of oxide-silane composite coating on AZ31 magnesium alloy
AU - Da Forno, A.
AU - Bestetti, M.
AU - Trasatti, S. P.
AU - Trueba, M.
PY - 2013/9
Y1 - 2013/9
N2 - Various oxide films have been grown on AZ31 magnesium alloy by microarc oxidation in alkaline phosphate solution with addition of different compounds (Na2SiO3, NaAlO2). Because of the anodic oxide porosity, arising from the sparking treatment, organo-functional silane coatings have been applied to seal pores and cracks and achieve a more effective protective system. The surface and cross-section morphologies of the anodic films were analysed by scanning electron microscopy. The phase composition was determined by X-ray diffraction. Bare and anodised AZ31 specimens were post-treated with silanes, namely N-phenil-3-aminopropyltrimethoxysilane and Bis (trimethoxysilylethyl) benzene. The corrosion resistance of anodic oxides and oxide-silane composite coatings was evaluated in dilute Harrison solution by means of single-cycle anodic polarisation. The results showed that the addition of different salts to the alkaline phosphate solution affects the surface morphology and the phase composition of the coatings and, as a consequence, the corrosion resistance behaviour. Both silane post-treatments provide further corrosion protection to samples anodised in aluminate containing solution.
AB - Various oxide films have been grown on AZ31 magnesium alloy by microarc oxidation in alkaline phosphate solution with addition of different compounds (Na2SiO3, NaAlO2). Because of the anodic oxide porosity, arising from the sparking treatment, organo-functional silane coatings have been applied to seal pores and cracks and achieve a more effective protective system. The surface and cross-section morphologies of the anodic films were analysed by scanning electron microscopy. The phase composition was determined by X-ray diffraction. Bare and anodised AZ31 specimens were post-treated with silanes, namely N-phenil-3-aminopropyltrimethoxysilane and Bis (trimethoxysilylethyl) benzene. The corrosion resistance of anodic oxides and oxide-silane composite coatings was evaluated in dilute Harrison solution by means of single-cycle anodic polarisation. The results showed that the addition of different salts to the alkaline phosphate solution affects the surface morphology and the phase composition of the coatings and, as a consequence, the corrosion resistance behaviour. Both silane post-treatments provide further corrosion protection to samples anodised in aluminate containing solution.
KW - Corrosion resistance
KW - Magnesium alloys
KW - Microarc oxidation
KW - Silane based coatings
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UR - http://www.scopus.com/inward/citedby.url?scp=84885595905&partnerID=8YFLogxK
U2 - 10.1179/0020296713Z.000000000117
DO - 10.1179/0020296713Z.000000000117
M3 - Article
AN - SCOPUS:84885595905
VL - 91
SP - 275
EP - 280
JO - Transactions of the Institute of Metal Finishing
JF - Transactions of the Institute of Metal Finishing
SN - 0020-2967
IS - 5
ER -