Protection of the AZ31 magnesium alloy with cerium modified silane coatings

Zanotto, Federica; Grassi, V.; Frignani, A.; Zucchi, F.

doi:10.1016/j.matchemphys.2011.05.013

Cited by 69 publications

(35 citation statements)

References 26 publications

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“…Organosilane coatings attracted a significant research attention in recent years, due to their protective efficiency towards the corrosion of several alloys [8][9][10][11]. Many studies investigated the protective efficiency of silane coatings against copper or bronze corrosion in artificial rain or in solutions containing specific pollutants, mainly chlorides.…”

Section: Introductionmentioning

confidence: 99%

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

Chiavari

Balbo

Bernardi

et al. 2015

Progress in Organic Coatings

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a b s t r a c t3-Mercapto-propyl-trimethoxy-silane (PropS-SH) coatings, with or without the addition of three types of oxide particles (CeO 2 (nano-sized), TiO 2 (nano-sized) and La 2 O 3 (micro-sized)), were applied on quaternary bronze (Cu-Sn-Zn-Pb) and tested through natural and artificial exposures. In particular, uncoated and coated samples were exposed both in the coastal town of Rimini (Italy) under sheltered/unsheltered conditions and in a climatic chamber where the samples underwent temperature/UV cycles, at constant humidity. The sample surfaces were periodically characterized by SEM, EDS, micro-Raman, FTIR and XRD techniques. Moreover, during natural exposures, runoff rainwater was collected monthly, in order to evaluate the release of the alloying metals from bronze by atomic absorption spectrometry (AAS). The results showed that micro-scale cracking and spalling phenomena took place during natural exposure, partly limiting the protective efficiency of the organosilane coating. In fact, UV radiation has a strong influence on coating performance, inducing structural modifications of the polymer. Oxide particle-and especially TiO 2 -charged coatings proved to be more resistant to UV degradation.

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Section: Introductionmentioning

confidence: 99%

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

Chiavari

Balbo

Bernardi

et al. 2015

Progress in Organic Coatings

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“…In this context, sol-gel coatings have been investigated as potential replacements for chromate-based surface treatments for several metals [1][2][3][4][5]. Different silane derivatives have been used to protect metals from corrosion by forming a thin coating that acts as a physical barrier to delay the access of aggressive species to the substrate.…”

Section: Introductionmentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

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Sol-gel films were prepared using different ratios of two silica precursors, vinyltrimethoxysilane (VTMS) and tetraethylorthosilicate (TEOS), targeting the anticorrosion treatment of aluminum alloy 2024-T3. The electrochemical behavior of the alloy coated with such films, which was studied in a 0.05 mol L -1 NaCl solution, revealed that the VTMS/TEOS ratio drastically affects the anticorrosion performance. Electrochemical impedance spectroscopy (EIS) results provided evidences that the best anticorrosive response occurs with the films prepared from 50% v/v ethanol, 46% v/v water, 3% v/v VTMS and 1% v/v TEOS. Moreover, the effects of the addition of ethylenediamine tetra(methylene phosphonic acid) (EDTPO) to a hybrid sol-gel matrix were examined. The corrosion resistance was considerably improved when the concentration of added phosphonic acid was 3.7510 -5 mol·L -1 . Scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses revealed that EDTPO-containing films provide a more uniform coverage. Results evidenced the formation of Si-O-Al linkages in the VTMS/TEOS and VTMS/TEOS/EDTPO systems and that the VTMS/TEOS/EDTPO system contained P-O-Al linkages. The P-O-Al bonds, combined with the silica network action, may be responsible for the good anticorrosive behavior of the VTMS/TEOS/EDTPO films.

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“…The low‐frequency circle was assumed to describe the combined response of the electrical double layer and the hydroxide film. This aspect would be ascribed to the interfacial charge transfer resistance in parallel with barrier layers or linked to the Mg 2+ diffusion through the corrosion product layer . The system was characterized by a constant phase element ( CPE ) instead of pure capacitor, taking into account the non ideal behavior of the film.…”

Section: Resultsmentioning

confidence: 99%

Surface evaluation and electrochemical behavior of cerium conversion coating modified with silane on magnesium alloy

Wang

Liu

et al. 2014

Surf. Interface Anal.

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A new cerium conversion coating modified with the hydrolysis silane is designed for AZ31 magnesium alloy, which aims at assessing the surface characterizations and electrochemical behaviors between the cerium conversion coating with and without the silane modified. The effect of the silane addictive is studied by scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS). The adhesion of the coatings is undertaken according to the American Society for Testing and Materials (ASTM) standard D3359‐08 cross tape test. The electrochemical behavior is evacuated by polarization experiment and electrochemical impedance spectroscopy (EIS) in NaCl electrolyte. The results show that the addition of bis‐[triethoxysilylpropyl] tetrasulfide (BTESPT) to loosen and porous cerium conversion coating leads to the formation of a more compact and homogenous film, higher resistance to water uptake and better adhesion to substrate. Electrochemical measurements show that, compared with the non‐modified cerium conversion coating, the coating modified with the silane exhibits better anticorrosion properties. Copyright © 2014 John Wiley & Sons, Ltd.

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Protection of the AZ31 magnesium alloy with cerium modified silane coatings

Cited by 69 publications

References 26 publications

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Surface evaluation and electrochemical behavior of cerium conversion coating modified with silane on magnesium alloy

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