Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings

Fintová, Stanislava; Drábiková, Juliána; Pastorek, Filip; Tkácz, Jakub; Kuběna, Ivo; Trško, Libor; Hadzima, Branislav; Minda, Jozef; Doležal, Pavel; Wasserbauer, Jaromír; Ptáček, Petr

doi:10.1016/j.surfcoat.2018.10.038

Cited by 41 publications

(29 citation statements)

References 55 publications

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“…Za účelom zlepšenia mechanických, ale aj koróznych vlastnosti sa horčík leguje rôznymi prísadami. Systém Mg-Al-Zn patrí medzi najrozšírenejšie systémy z pohľadu horčíkových zliatin využívaných pri izbových teplotách najmä v dopravných prostriedkoch [1][2][3][4]. Využitie týchto materiálov však zostáva značne limitované.…”

Section: úVodunclassified

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Kajánek

Hadzima

Tkácz

et al. 2019

Koroze a Ochrana Materialu

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The coating prepared by plasma electrolytic oxidation (PEO) was created on AZ31 magnesium alloy surface with the aim to evaluate its effect on corrosion resistance. The DC current was applied on the sample in solution consisted of 10 g/l Na3PO4·12H2O and 1 g/l KOH. Additional samples were prepared with 2 and 4 minutes of preparation to observe evolution of the PEO coating. Morphology of the coatings was evaluated by scanning electron microscopy and chemical composition was examined by EDX analysis. Electrochemical characteristic were measured by potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.1 M NaCl at the laboratory temperature. Obtained data were presented in form of potentiodynamic curves and Nyquist diagrams. Results of analysis showed that plasma electrolytic oxidation coating positively influence corrosion resistance of AZ31 magnesium alloy in chosen corrosive environment.

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Section: úVodunclassified

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Kajánek

Hadzima

Tkácz

et al. 2019

Koroze a Ochrana Materialu

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“…The surface system also exhibited similar behaviour to that observed for some metals able to create passive layers. This is underlined by the presence of a step potential change in the anodic region responding to the pitting potential (E pit ) [32][33][34]. At this point, there is a severe local corrosion damage present on the surface of the sample.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

Pastorek¹,

Štrbák²,

Kajánek³

et al. 2021

Communications

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A surface treatment process, composed of plasma electrolytic oxidation (PEO) and sealing by temporary oil preservation system containing corrosion inhibitors, was performed on AZ31 magnesium alloy in order to improve its corrosion resistance in environments containing chlorides. Both atmospheric and immersion conditions were evaluated by electrochemical tests in 0.1M NaCl solution together with salt spray test according to STN EN ISO 9227 standard. The obtained results confirmed significant improvement of corrosion resistance reached by the PEO sealing in aggressive environments compared to the pure PEO coating on AZ31 surface. Hence, such a duplex coating is a very perspective alternative for magnesium alloy applications in severe conditions or for temporary protection of magnesium products coated by the PEO during marine transport.

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“…However, the highest coating thickness and best uniform coating layer was obtained with 40% HF treated substrate (Bakhsheshi-Rad et al, 2013). In general, the treatment time is directly proportional to coating thickness, rapid corrosion and initial degradation can be delayed with thick coating (Fintová et al, 2019). Fluoride-based treatment not only improves biocompatibility but also offers appropriate protection against corrosion with the formation of MgF 2 and improved adhesion strength confirmed by scratch tests due to the formation of barrier type film (Drábiková et al, 2018).…”

Section: Chemical Surface Modification Of Mg Alloys-fluoride Pretreatmentioning

confidence: 97%

Magnesium Alloys With Tunable Interfaces as Bone Implant Materials

Rahman

Dutta

Choudhury

2020

Front. Bioeng. Biotechnol.

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Magnesium (Mg) based biodegradable materials are a new generation orthopedic implant materials that are intended to possess same mechanical properties as that of bone. Mg alloys are considered as promising substitutes to permanent implants due to their biodegradability in the physiological environment. However, rapid corrosion rate is one of the major constraints of using Mg alloys in clinical applications in spite of their excellent biocompatibility. Approaches to overcome the limitations include the selection of adequate alloying elements, proper surface treatment, surface modification with coating to control the degradation rate. This review focuses on current advances on surface engineering of Mg based biomaterials for biomedical applications. The review begins with a description of corrosion mechanism of Mg alloy, the requirement for appropriate surface functionalization/coatings, their structure-property-performance relationship, and suitability for biomedical applications. The control of physico-chemical properties such as wettability, surface morphology, surface chemistry, and surface functional groups of the coating tailored by various approaches forms the pivotal part of the review. Chemical surface treatment offers initial protection from corrosion and inorganic coating like hydroxyapatite (HA) improves the biocompatibility of the substrate. Considering the demand of ideal implant materials, multilayer hybrid coatings on Mg alloy in combination with chemical pretreatment or inorganic HA coating, and protein-based polymer coating could be a promising technique to improve corrosion resistance and promote biocompatibility of Mg-based alloys.

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Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings

Cited by 41 publications

References 55 publications

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

Magnesium Alloys With Tunable Interfaces as Bone Implant Materials

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