Hybrid epoxy–silane coatings for improved corrosion protection of Mg alloy

Brusciotti, Fabiola; Snihirova, Darya; Xue, H.B.; Montemor, M.F.; Lamaka, Sviatlana V.; Ferreira, M.G.S.

doi:10.1016/j.corsci.2012.10.013

Cited by 165 publications

(82 citation statements)

References 39 publications

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“…Este método busca hacer uso de la gran adhesión de los recubrimientos inorgánicos y de la baja tendencia al agrietamiento de los orgánicos, para la obtención de películas con mejores propiedades mecánicas y mayor resistencia a la corrosión [14], [16], [17]. Así mismo, mediante un control adecuado del pH del sol se pueden crear estructuras porosas, fundamentalmente en presencia del precursor APTES, que permiten la posibilidad de incluir inhibidores de corrosión que actúan como dopantes y que otorgan al recubrimiento propiedades autocurativas en caso de que exista un daño bajo condiciones de operación.…”

Section: Introductionunclassified

Síntesis, caracterización y evaluación de recubrimientos híbridos porosos sol-gel dopados con acetato de cerio sobre la aleación de magnesio WE54-AE

Barrios¹,

Eugenio²,

Coy-Echeverría³

et al. 2014

Iteckne

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Section: Introductionunclassified

Síntesis, caracterización y evaluación de recubrimientos híbridos porosos sol-gel dopados con acetato de cerio sobre la aleación de magnesio WE54-AE

Barrios¹,

Eugenio²,

Coy-Echeverría³

et al. 2014

Iteckne

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“…The rapid drop of the values of R SG and R mix is observed during the initial 3 days and could be associated with electrolyte uptake. 24,39 At time periods of more than 7 days a slight increase for R mix is observed and is Fig. 5 Optical photographs of ZE_SG after 7 days (a) and ZE_A-nod_SG (b), ZE_Anod_Tr_SG (c) samples after 30 days of immersion in 3% NaCl solution.…”

Section: Protective Behavior Of Composite Coatingsmentioning

confidence: 99%

“…6,[34][35][36][37][38][39] Addition of corrosion inhibitors to coatings imparts them with the important property of active protection and improve overall protective performance, providing that the coating's barrier properties are not affected by, oen detrimental, chemical interaction of inhibitors with components of the coatings. 6,24,40,41 A composite coating is a necessity when long lasting durable protection needs to be provided to one of the most corrosion susceptible Mg alloys, such as ZE41, used in this work.…”

Section: Introductionmentioning

confidence: 99%

Active corrosion protection coating for a ZE41 magnesium alloy created by combining PEO and sol–gel techniques

et al. 2016

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An active protective coating for ZE41 magnesium alloy was produced by sealing an anodic layer, loaded with 1,2,4-triazole, with a sol-gel film. An anodic oxide layer was formed using PEO in a silicate-fluoride alkaline solution. This thin (1.8 mm) porous PEO layer was impregnated with corrosion inhibitor 1,2,4-triazole and sealed with a silica-based sol-gel film modified with titanium oxide. For the first time it was demonstrated that this relatively thin PEO-based composite coating revealed high barrier properties and provided superior protection against corrosion attack during 1 month of continuous exposure to 3% NaCl. A scanning vibrating electrode technique showed a sharp decrease (100 times) of corrosion activity in micro defects formed in the 1,2,4-triazole doped composite coating, when compared to blank samples.

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“…[6][7][8][9] Surface treatment, specifically coating, is an effective way to improve corrosion resistance and wear resistance of Mg alloys. 8 Extensive surface treatment methods on Mg-base alloys have been studied, such as chemical conversion coatings, [10][11][12] electroless plating/electroplating, [13][14][15][16] anodizing, 17,18 micro-arc oxidation, [19][20][21] organic coatings, [22][23][24] and diamond-like carbon (DLC) coatings. 25 Among them, nickel-phosphorous (Ni-P) plating remains of high interest because of its unique advantages, including good corrosion resistance, wear resistance, lubricity, acceptable ductility, electric conduction and high hardness.…”

mentioning

confidence: 99%

Ultrasonic-Assisted Electroless Ni-P Plating on Dual Phase Mg-Li Alloy

Zou

Zhang

Liu

et al. 2014

J. Electrochem. Soc.

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An ultrasonic-assisted method for electroless Ni-P plating on dual-phase Mg-Li alloy is proposed. Environmentally-friendly Ce(NO 3 ) 3 -KMnO 4 solution was successfully applied for the pre-treatment. Uniform and compact Ni-P coatings with fine structures have been successfully obtained. The Ni-P coatings are mixed with amorphous-crystalline features and well adhered to the substrates. The corrosion resistances were investigated by electrochemical impedance spectroscopy, open circuit potential, potentiodynamic polarization and hydrogen evolution tests. The results indicate that ultrasonic processing significantly improves the corrosion resistance of Ni-P coatings due to the formation of uniform, dense and fine structures, which strengthen the passive film. Magnesium-lithium (Mg-Li) alloys are the lowest in density of metallic structural materials.1 Mg-Li alloys have excellent properties, such as high specific strength, good formability, damping capacity, impact resistance and energetic particle penetration tolerances.1,2 These properties provide Mg-Li alloys with a great potential for various applications, especially for transportation, in the aerospace industry and for electronic components.3-5 However, the application of Mg-Li alloys is restricted in practice due to undesirable properties, mainly poor corrosion and wear resistance.6-9 Surface treatment, specifically coating, is an effective way to improve corrosion resistance and wear resistance of Mg alloys. Among them, nickel-phosphorous (Ni-P) plating remains of high interest because of its unique advantages, including good corrosion resistance, wear resistance, lubricity, acceptable ductility, electric conduction and high hardness. 26 However, electroless Ni-P plating on Mg-Li base alloys, specifically on dual phase Mg-8 wt%Li base alloys, is much more difficult than on other Mg base alloys because the standard electrode potential of Li (−3.045 V vs SHE) is lower than that of Mg (−2.37 V vs SHE), making the alloy extremely susceptible to galvanic corrosion. This results in an unattractive appearance of plating and in the degradation of mechanical properties.Electroless nickel plating is an autocatalytic reaction for deposition of nickel on a substrate. 27 There are two main methods for electroless nickel plating on magnesium alloys, i.e. direct electroless nickel plating 9,28,29 and zinc immersion. 8,30-32 Direct electroless nickel plating has the advantages of simplicity and suitability for magnesium alloys with high aluminum content. Nevertheless, the main disadvantage of this method is the use of hexavalent chromium compounds [Cr(VI)] and hydrofluoric acid [HF] during the etching and conversion coating treatments. These materials are not friendly to the environment and increase the risk to people during operation. 8,9 The zinc immersion procedure is complicated and the step of plating copper with cyanide is poisonous to humans and the environment. In addition, common electroless nickel plating exhibits other drawbacks, such as energy consumption, fast ev...

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Hybrid epoxy–silane coatings for improved corrosion protection of Mg alloy

Cited by 165 publications

References 39 publications

Síntesis, caracterización y evaluación de recubrimientos híbridos porosos sol-gel dopados con acetato de cerio sobre la aleación de magnesio WE54-AE

Síntesis, caracterización y evaluación de recubrimientos híbridos porosos sol-gel dopados con acetato de cerio sobre la aleación de magnesio WE54-AE

Active corrosion protection coating for a ZE41 magnesium alloy created by combining PEO and sol–gel techniques

Ultrasonic-Assisted Electroless Ni-P Plating on Dual Phase Mg-Li Alloy

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