Complex anticorrosion coating for ZK30 magnesium alloy

Lamaka, Sviatlana V.; Knörnschild, Gerhard Hans; Snihirova, Darya; Taryba, Maryna; Zheludkevich, Mikhail L.; Ferreira, M.G.S.

doi:10.1016/j.electacta.2009.08.018

Cited by 154 publications

(80 citation statements)

References 25 publications

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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%

“…Hydroxide seals and densies cracks and pores the anodized layer. 24 Aer the 3 rd day, when the sol-gel lm and mixed oxide-SG layer is already penetrated by electrolyte, the resistance of the dense barrier layer is prevalent in both systems. At the 30 st day of the test the parameter R ox has a rather high value for both samples: 4 Â 10 8 ohm cm 2 for ZE_Anod_SG and 7 Â 10 8 ohm cm 2 for ZE_Anod_Tr_SG.…”

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. 42 This article presents a novel coating for magnesium alloy with active protection against corrosion attack.…”

Section: Introductionmentioning

confidence: 99%

“…Current studies on anodizing range from coating formation to post-treatment techniques. 6,[23][24][25][26][27][28][29][30][31][32][33] Sol-gel treatment [23][24][25][26][27] and organic lm coating, 28,29 hardening with alkaline solutions of silicates and phosphates, 25 electroless metal deposition, 30,31 E-coating, 32 in situ sealing 33 are utilized to increase protective performance of PEO coatings.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Protective Behavior Of Composite Coatingsmentioning

confidence: 99%

Section: Protective Behavior Of Composite Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2016

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“…Local scanning probe techniques such as several modes of scanning electrochemical microscopy (SECM), [13][14][15][16][17][18][19] scanning Kelvin probe force microscopy (SKPFM), [20][21][22] the scanning vibrating electrode technique (SVET) [23][24][25] and local electrochemical impedance spectroscopy (LEIS) 26 have been used to probe the heterogeneous surfaces of Mg alloys and to assess the electrochemical behavior of the different microstructural constituents responsible for microgalvanic corrosion. Among these techniques, SECM has the ability to quantify electrochemical fluxes in situ with high lateral resolution using a microelectrode (ME).…”

mentioning

confidence: 99%

Local Hydrogen Fluxes Correlated to Microstructural Features of a Corroding Sand Cast AM50 Magnesium Alloy

Dauphin‐Ducharme

Asmussen

Tefashe

et al. 2014

J. Electrochem. Soc.

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Successful in situ spatiotemporal tracking of corrosion processes occurring at heterogeneous Mg alloy microstructures was achieved through tandem analyses involving electron and electrochemical microscopies. Through cross-correlation of scanning electron microscopy and scanning electrochemical microscopy images and subsequent analytical transmission electron microscopy, the morphology and chemical composition of microstructural components on the surface of a sand-cast AM50 Mg alloy were related to their respective local evolution of H 2 with micron scale resolution prior to, during and post corrosion. The results confirm that the preferential water reduction sites in the initial stages of corrosion are the Al 8 Mn 5 intermetallics while a β-Mg 17 Al 12 precipitate contaminated with Ni becomes cathodically active at a later stage of corrosion. This approach demonstrates the power of correlative approaches to probe and understand local electrochemical phenomena. Owing to their light weight, high strength-to-weight ratio, good castability and high damping capacity, Mg alloys are ideal candidates for automotive structural components.1-5 The compromise of formability, room temperature ductility and price represent major challenges in commercializing these materials. Importantly, Mg alloys also suffer from poor corrosion resistance in aqueous environments 6-8 and due to their positions in the electrochemical activity series, are highly susceptible to accelerated corrosion rates when in galvanic contact with a more noble material.9 At open circuit, the overall galvanic current is null due to a balance between the anodic and cathodic current densities, while on a microscopic scale, a difference in electrochemical potential is obtained. In Mg alloys, galvanic coupling between microstructural components of the alloy (commonly referred to as microgalvanic coupling) stems from an inherent electrochemical potential difference between the Mg matrix and its secondary phases, [10][11][12] and can be tracked using local scanning probe methods.Local scanning probe techniques such as several modes of scanning electrochemical microscopy (SECM), [13][14][15][16][17][18][19] scanning Kelvin probe force microscopy (SKPFM), 20-22 the scanning vibrating electrode technique (SVET) [23][24][25] and local electrochemical impedance spectroscopy (LEIS) 26 have been used to probe the heterogeneous surfaces of Mg alloys and to assess the electrochemical behavior of the different microstructural constituents responsible for microgalvanic corrosion. Among these techniques, SECM has the ability to quantify electrochemical fluxes in situ with high lateral resolution using a microelectrode (ME). 27 This technique has been successfully applied in corrosion research to provide in situ analyses of pitting corrosion at oxide films, [28][29][30] to assess lateral variations in corrosion kinetics, 31 and to detect defects within coated metal samples. 32The feedback mode of SECM has been employed to probe corroding AM60 15 and AZ31 17 Mg alloys. The incre...

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An Impact of the Recent Developments in Coating Materials and Techniques on the Corrosion Response of AZ91D Alloy: A Review

et al. 2023

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AZ91D, a die‐casted alloy, offers several benefits (better saltwater corrosion resistance, suitable castability, and good atmospheric stability) over other grades of magnesium alloy. However, it cannot overcome the challenging requirements of advanced applications in its current form. Extensive research in coating technologies is crucial in enhancing the performance of AZ91D alloy in highly corrosive environments (coastal and marine, industrial, farm, etc.). The high corrosion resistance of AZ91D for various applications is achievable through the deposition of different materials. Developments in coating materials and techniques, with their influence on the corrosion protection behavior of AZ91D alloy, over the last decade (2012–2022), are focused on in this study. It is observed that composite, biodegradable, and self‐healing coatings are gaining popularity. The transition in the coating technology, from conventional to self‐healing coating materials and from conventional to environment‐friendly coating techniques, is a vital part of this discussion. This review further explores how different additives, pre‐treatments, post‐treatments, and corrosion inhibitors affect the corrosion performance of coatings. This study helps select the optimum coating material for AZ91D magnesium alloy to fulfil a specific application requirement and guides toward technological developments in this segment.

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Complex anticorrosion coating for ZK30 magnesium alloy

Cited by 154 publications

References 25 publications

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

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

Local Hydrogen Fluxes Correlated to Microstructural Features of a Corroding Sand Cast AM50 Magnesium Alloy

An Impact of the Recent Developments in Coating Materials and Techniques on the Corrosion Response of AZ91D Alloy: A Review

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