Fault-tolerant epoxy-silane coating for corrosion protection of magnesium alloy AZ31

S.V. Lamaka, H.B. Xue, N.N.A.H. Meis, A.C.C. Esteves, M.G.S. Ferreira

Research output: Contribution to journalArticleAcademicpeer-review

42 Citations (Scopus)

Abstract

In this work, a hybrid epoxy-silane coating was developed for corrosion protection of magnesium alloy AZ31. The average thickness of the film produced by dip-coating procedure was 14 µm. The adhesion strength of the epoxy-silane coating to the Mg substrate was evaluated by pull-off tests and was found to be higher than 16 MPa both in dry and wet conditions. The hybrid epoxy-silane coating showed high corrosion resistance both when intact and when punched through by a needle. The low frequency impedance of intact coating was higher than 1 GO cm2 after one month of immersion in 3.5% NaCl solution. Both, artificially induced defects and corrosion sites that appeared on the metal surface did not propagate. Their passivation behavior, that we call fault-tolerance, was observed by EIS, SVET-SIET and SEM-EDS. It was ascribed to the good adhesion, high coating integrity and corrosion inhibiting effect provided by diethylenetriamine used as epoxy hardener.
LanguageEnglish
Pages98-105
Number of pages8
JournalProgress in Organic Coatings
Volume80
DOIs
StatePublished - 2015

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Silanes
Corrosion protection
Magnesium alloys
Coatings
Corrosion
Bond strength (materials)
Fault tolerance
Passivation
Needles
Corrosion resistance
Mg-Al-Zn-Mn-Si-Cu alloy
Energy dispersive spectroscopy
Adhesion
Metals
Defects
Scanning electron microscopy
Substrates

Cite this

Lamaka, S.V. ; Xue, H.B. ; Meis, N.N.A.H. ; Esteves, A.C.C. ; Ferreira, M.G.S./ Fault-tolerant epoxy-silane coating for corrosion protection of magnesium alloy AZ31. In: Progress in Organic Coatings. 2015 ; Vol. 80. pp. 98-105
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abstract = "In this work, a hybrid epoxy-silane coating was developed for corrosion protection of magnesium alloy AZ31. The average thickness of the film produced by dip-coating procedure was 14 µm. The adhesion strength of the epoxy-silane coating to the Mg substrate was evaluated by pull-off tests and was found to be higher than 16 MPa both in dry and wet conditions. The hybrid epoxy-silane coating showed high corrosion resistance both when intact and when punched through by a needle. The low frequency impedance of intact coating was higher than 1 GO cm2 after one month of immersion in 3.5{\%} NaCl solution. Both, artificially induced defects and corrosion sites that appeared on the metal surface did not propagate. Their passivation behavior, that we call fault-tolerance, was observed by EIS, SVET-SIET and SEM-EDS. It was ascribed to the good adhesion, high coating integrity and corrosion inhibiting effect provided by diethylenetriamine used as epoxy hardener.",
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Fault-tolerant epoxy-silane coating for corrosion protection of magnesium alloy AZ31. / Lamaka, S.V.; Xue, H.B.; Meis, N.N.A.H.; Esteves, A.C.C.; Ferreira, M.G.S.

In: Progress in Organic Coatings, Vol. 80, 2015, p. 98-105.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Lamaka,S.V.

AU - Xue,H.B.

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AU - Esteves,A.C.C.

AU - Ferreira,M.G.S.

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AB - In this work, a hybrid epoxy-silane coating was developed for corrosion protection of magnesium alloy AZ31. The average thickness of the film produced by dip-coating procedure was 14 µm. The adhesion strength of the epoxy-silane coating to the Mg substrate was evaluated by pull-off tests and was found to be higher than 16 MPa both in dry and wet conditions. The hybrid epoxy-silane coating showed high corrosion resistance both when intact and when punched through by a needle. The low frequency impedance of intact coating was higher than 1 GO cm2 after one month of immersion in 3.5% NaCl solution. Both, artificially induced defects and corrosion sites that appeared on the metal surface did not propagate. Their passivation behavior, that we call fault-tolerance, was observed by EIS, SVET-SIET and SEM-EDS. It was ascribed to the good adhesion, high coating integrity and corrosion inhibiting effect provided by diethylenetriamine used as epoxy hardener.

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SN - 0300-9440

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