Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

Drábiková, Juliána; Fintová, Stanislava; Ptáček, Petr; Kuběna, Ivo; Březina, Matěj; Wasserbauer, Jaromír; Doležal, Pavel; Pastorek, Filip

doi:10.1016/j.surfcoat.2020.126101

Cited by 14 publications

(20 citation statements)

References 29 publications

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“…The process was finished at the time when only Mg and F elements were present on the surface of the coated specimens (determined by the EDS analysis). If the Na element was detected on the specimen's surface, the Na[MgF 3 ] secondary layer was considered to be still present on the fluoride conversion coating and the process of dissolution was not finished and the boiling was continued [27]. If the presence of Na was not confirmed, the secondary layer Na[MgF 3 ] was considered to be removed successfully.…”

Section: Preparation Of the Fluoride Conversion Coatingmentioning

confidence: 99%

“…Several studies [16][17][18][19][20][21] have shown that the fluoride conversion coating is suitable for protecting the biodegradable magnesium alloys against corrosion in biological environments while the coating is acceptable for the human body. The preparation of fluoride conversion coating can be based on dipping the magnesium alloy into the HF solution [16][17][18]22,23] or the less used way based on dipping the magnesium alloy into Na [BF 4 ] molten salt [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…The fluoride conversion coating prepared by dipping AZ31 or AZ61 magnesium alloys into Na [BF 4 ] molten salt consisted of two layers [24][25][26][27][28]. The layer located closer to the base material is composed of MgF 2 compound and the layer located on the top of the fluoride conversion coating is composed of Na[MgF 3 ] double salt [24].…”

Section: Introductionmentioning

confidence: 99%

“…Even though the thickness and chemical composition of the fluoride conversion coating prepared by dipping specimens into HF solution for 24 h at laboratory temperature and Na [BF 4 ] molten salt for 2 h at 450 • C was the same, a higher improvement of the corrosion resistance was observed in the case of applying the fluoride conversion coating from Na[BF 4 ] molten salt [31]. Even though the authors described the coating creation mechanism in [27] and the alloy corrosion resistance improvement in [25,28], they did not explain the presence of defects on the coating surface.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

et al. 2021

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Wrought AZ31 magnesium alloy was used as the experimental material for fluoride conversion coating preparation in Na[BF4] molten salt. Two coating temperatures, 430 °C and 450 °C, and three coating times, 0.5, 2, and 8 h, were used for the coating preparation. A scanning electron microscope and energy-dispersive X-ray spectroscopy were used for an investigation of the surface morphology and the cross-sections of the prepared coatings including chemical composition determination. The corrosion resistance of the prepared specimens was investigated in terms of the potentiodynamic tests, electrochemical impedance spectroscopy and immersion tests in the environment of simulated body fluids at 37 ± 2 °C. The increase in the coating temperature and coating time resulted in higher coatings thicknesses and better corrosion resistance. Higher coating temperature was accompanied by smaller defects uniformly distributed on the coating surface. The defects were most probably created due to the reaction of the AlxMny intermetallic phase with Na[BF4] molten salt and/or with the product of its decomposition, BF3 compound, resulting in the creation of soluble Na3[AlF6] and AlF3 compounds, which were removed from the coating during the removal of the secondary Na[MgF3] layer. The negative influence of the AlxMny intermetallic phase was correlated to the particle size and thus the size of created defects.

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Section: Preparation Of the Fluoride Conversion Coatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

et al. 2021

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“…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). Fluoride/biopolymer coated substrate has shown enhanced corrosion resistance along with increased cell adhesion, cell viability, and cell proliferation on the surface of the substrate (Lee et al, 2019).…”

Section: Chemical Surface Modification Of Mg Alloys-fluoride Pretreatmentioning

confidence: 99%

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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Coatings made from chemicals: A review

Chowdhury,

Nepal,

Bhattarai

et al. 2023

Vietnam Journal of Chemistry

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In the ongoing process of civilization, surface modification has become almost an indispensable route to enjoy the optimum benefit from any material in the materialistic world. Especially, active metals require the modification maximum to escape the natural corrosion or passivation. The retention of sound performance of the metals as well as extension of their lifetime can be achieved by surface modification of coating formation. Chemical coating is one of the simple and low‐cost methods of coating with great versatility including pre‐treatment and post‐treatment. This paper includes the most widely used inorganic and organic chemical coating methods and their fewer details and their future outlooks.

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Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy

Cited by 14 publications

References 29 publications

Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

Magnesium Alloys With Tunable Interfaces as Bone Implant Materials

Coatings made from chemicals: A review

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