Morphological studies on the development of chemical conversion coating on surface of Mg–4Zn alloy and its corrosion and bio mineralisation behaviour in simulated body fluid

Prabhu, Deepa B.; Gopalakrishnan, P.; Ravi, K.R.

doi:10.1016/j.jallcom.2019.152146

Cited by 46 publications

(14 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are consistent with the presence of some deep pits on the surface of the specimens exposed to PBS solution (Figure 2g,h) and the slight decrease in the corrosion rate obtained from the weight loss measurements (Figure 3). The greater resistance of the corrosion layer formed in Hank's and SBF solutions (containing HPO 4 2− and Ca 2+ ions) is in agreement with results reported in the literature, suggesting that the hydroxyapatite could limit the transformation from metastable to stable pits and promote the formation of a temporary barrier between the substrate and medium to increase the general corrosion resistance [3,29,50].…”

Section: Relationship Between the Surface Chemistry Of The Corrosion ...supporting

confidence: 90%

Experimental Apparent Stern–Geary Coefficients for AZ31B Mg Alloy in Physiological Body Fluids for Accurate Corrosion Rate Determination

García-Galván

Fajardo

Barranco

et al. 2021

Metals

View full text Add to dashboard Cite

The corrosion behavior of AZ31B Mg alloy exposed to Ringer’s, phosphate-buffered saline (PBS), Hank’s, and simulated body fluid (SBF) solutions for 4 days was investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, weight loss, and surface characterization. Changes in corrosion rates with immersion time determined by weight loss measurements were compared with EIS data to determine the possibility of obtaining quantitative electrochemical information. In addition, changes in the protective properties of the corrosion product layer calculated from the EIS parameters were evaluated as a function of their surface chemical composition as determined by X-ray photoelectron spectroscopy (XPS) and visual observations of the corroded specimen’s surface. Apparent Stern–Geary coefficients for the AZ31B Mg alloy in each test solution were calculated using the relationship between icorr from weight loss measurements and the EIS data (both Rp and Rt). This provided experimental reference B′ values that may be used as a useful tool in independent investigations to improve the accuracy of corrosion rates of AZ31B Mg alloy in simulated body solutions.

show abstract

Section: Relationship Between the Surface Chemistry Of The Corrosion ...supporting

confidence: 90%

Experimental Apparent Stern–Geary Coefficients for AZ31B Mg Alloy in Physiological Body Fluids for Accurate Corrosion Rate Determination

García-Galván

Fajardo

Barranco

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…199,200 Chemical conversion coating on Mg-4Zn alloy using sodium bicarbonate (NaHCO 3 ) and simulated body fluid solution slow down the rate of hydrogen evolution. 201 MAO coating, which uses the anodization process, effectively reduces the corrosion rate of AZ91D alloy. 202 Gu et al reported that the MAO coating improve the corrosion resistance and surface biocompatibility of Mg-Ca alloy.…”

Section: Physical Vapor Deposition (Pvd) and Chemical Vapor Deposition (Cvd)mentioning

confidence: 99%

“…A similar type coating of calcium phosphate, that is, dicalcium phosphate dihydrate (DCPD) surface layer on Mg substrate, effectively protects the substrate during the corrosion study 199,200 . Chemical conversion coating on Mg–4Zn alloy using sodium bicarbonate (NaHCO 3 ) and simulated body fluid solution slow down the rate of hydrogen evolution 201 . MAO coating, which uses the anodization process, effectively reduces the corrosion rate of AZ91D alloy 202 .…”

Section: Approaches To Improve Different Properties Of Mg Alloysmentioning

confidence: 99%

In vitro and in vivo degradation assessment and preventive measures of biodegradable Mg alloys for biomedical applications

Jana

Das

Balla

2021

J Biomedical Materials Res

View full text Add to dashboard Cite

Magnesium (Mg) and its alloys have been widely explored as a potential biodegradable implant material. However, the fast degradation of Mg‐based alloys under physiological environment has hindered their widespread use for implant applications till date. The present review focuses on in vitro and in vivo degradation of biodegradable Mg alloys, and preventive measures for biomedical applications. Initially, the corrosion assessment approaches to predict the degradation behavior of Mg alloys are discussed along with the measures to control rapid corrosion. Furthermore, this review attempts to explore the correlation between in vitro and in vivo corrosion behavior of different Mg alloys. It was found that the corrosion depends on experimental conditions, materials and the results of different assessment procedures hardly matches with each other. It has been demonstrated the corrosion rate of magnesium can be tailored by alloying elements, surface treatments and heat treatments. Various researches also studied different biocompatible coatings such as dicalcium phosphate dihydrate (DCPD), β‐tricalcium phosphate (β‐TCP), hydroxyapatite (HA), polycaprolactone (PCL), polylactic acid (PLA), and so on, on Mg alloys to suppress rapid degradation and examine their influence on new bone regeneration as well. This review shows the need for a standard method of corrosion assessment to predict the in vivo corrosion rate based on in vitro data, and thus reducing the in vivo experimentation.

show abstract

“…Alkaline earth elements tend to possess high chemical activity and easily react to oxygen in the air ( Dorozhkin, 2014 ). Thus, when Mg is exposed to body fluids, an oxidation reaction occurs on its surface, resulting in an abrupt release of hydrogen gas, and a rapid increase in local pH ( Sasikumar et al, 2019 ; Deepa et al, 2020 ; Cesarz-Andraczke et al, 2020 ). Unfortunately, the oxidized layers produced by this oxidation reaction are composed of MgO and Mg(OH) 2 , which are not dense enough to provide sufficient protection for Mg-based implants.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown that surface modification methods can not only delay the initial degradation of Mg and its alloys but also maintain their mechanical properties. Furthermore, the surface roughness produced by the coating can be favorable for cell adhesion and improve the biocompatibility of implants ( Zhou et al, 2019 ; Sasikumar et al, 2019 ; Deepa et al, 2020 ). As the major inorganic constituent of natural bone, calcium phosphate (CaP) coatings, including hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ), β-tricalcium phosphate (β-TCP, β-Ca 3 (PO 4 ) 2 ), dicalcium phosphate dihydrate (CaHPO 4 ·2H 2 O), and octacalcium phosphate (OCP, Ca 8 (HPO 4 ) 2 (PO 4 )4·5H 2 O), are appropriate for moderating the biodegradation of Mg alloys, and accelerating bone concrescence ( Zhang et al, 2018 ; Su et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior and Biocompatibility of Na2EDTA-Induced Nacre Coatings on AZ91D Alloys Prepared via Hydrothermal Treatment

et al. 2022

Front. Chem.

View full text Add to dashboard Cite

An effective method for controlling the corrosion rate of Mg-based implants must be urgently developed to meet the requirements of clinical applications. As a naturally occurring osteoid material, nacre offers a strategy to endow biomedical Mg alloys with excellent biocompatibility, and corrosion resistance. In this study, pearl powder and NaH2PO4 were used as precursors to deposit coatings on AZ91D alloy substrates hydrothermally based on Na2EDTA-assisted induction. Na2EDTA-induced nacre coatings were fabricated at various pH values, and its chemical composition and microstructure were analyzed via energy-dispersive X-ray, scanning electron microscopy, and X-ray diffraction spectroscopy. The corrosion-resistant performance and cytocompatibility of the samples were evaluated via electrochemical measurements and in vitro cell experiments. Results showed that the samples hydrothermally treated under faint acid conditions present excellent corrosion resistance, whereas the samples treated under slight alkaline conditions demonstrate improved biocompatibility due to high Ca and P content and large Ca/P atomic ratio. This study provides substantial evidence of the potential value of nacre coatings in expanding the biological applications of implanted biomaterials.

show abstract

Morphological studies on the development of chemical conversion coating on surface of Mg–4Zn alloy and its corrosion and bio mineralisation behaviour in simulated body fluid

Cited by 46 publications

References 70 publications

Experimental Apparent Stern–Geary Coefficients for AZ31B Mg Alloy in Physiological Body Fluids for Accurate Corrosion Rate Determination

Experimental Apparent Stern–Geary Coefficients for AZ31B Mg Alloy in Physiological Body Fluids for Accurate Corrosion Rate Determination

In vitro and in vivo degradation assessment and preventive measures of biodegradable Mg alloys for biomedical applications

Corrosion Behavior and Biocompatibility of Na2EDTA-Induced Nacre Coatings on AZ91D Alloys Prepared via Hydrothermal Treatment

Contact Info

Product

Resources

About