Anomaly of corrosion resistance of pure magnesium via soft plasma electrolysis at sub-zero temperature

2020 ◽  
Vol 385 ◽  
pp. 125383 ◽  
Author(s):  
S. Fatimah ◽  
Y.G. Kim ◽  
D.K. Yoon ◽  
Y.G. Ko
Keyword(s):  
Corrosion Resistance ◽  
Pure Magnesium ◽  
Zero Temperature ◽  
Plasma Electrolysis

Corrosion resistance of glucose-induced hydrothermal calcium phosphate coating on pure magnesium

2019 ◽  
Vol 465 ◽  
pp. 1066-1077 ◽  
Author(s):  
Ling-Yu Li ◽  
Lan-Yue Cui ◽  
Bin Liu ◽  
Rong-Chang Zeng ◽  
Xiao-Bo Chen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Calcium Phosphate ◽  
Pure Magnesium ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating

scholarly journals A new environmentally-friendly route to in situ form a high-corrosion-resistant nesquehonite film on pure magnesium

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35480-35489 ◽  
Author(s):  
Xianlong Cao ◽  
Quanyou Ren ◽  
Youkun Yang ◽  
Xianglong Hou ◽  
Yongbo Yan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Environmentally Friendly ◽  
Pure Magnesium ◽  
Protective Film ◽  
High Corrosion Resistance ◽  
Corrosion Resistant ◽  
High Corrosion

A nesquehonite protective film with high corrosion resistance was prepared on pure Mg via a new environmentally-friendly in situ carbonation route.

scholarly journals Improved corrosion resistance of commercially pure magnesium after its modification by plasma electrolytic oxidation with organic additives

2018 ◽  
Vol 33 (5) ◽  
pp. 725-740 ◽  
Author(s):  
Monica Echeverry-Rendon ◽  
Valentina Duque ◽  
David Quintero ◽  
Sara M Robledo ◽  
Martin C Harmsen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electrolyte Solution ◽  
Surface Coating ◽  
Plasma Electrolytic Oxidation ◽  
Biomedical Applications ◽  
The Body ◽  
Pure Magnesium ◽  
Surface Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The optimal mechanical properties render magnesium widely used in industrial and biomedical applications. However, magnesium is highly reactive and unstable in aqueous solutions, which can be modulated to increase stability of reactive metals that include the use of alloys or by altering the surface with coatings. Plasma electrolytic oxidation is an efficient and tuneable method to apply a surface coating. By varying the plasma electrolytic oxidation parameters voltage, current density, time and (additives in the) electrolytic solution, the morphology, composition and surface energy of surface coatings are set. In the present study, we evaluated the influence on surface coatings of two solute additives, i.e. hexamethylenetetramine and mannitol, to base solutes silicate and potassium hydroxide. Results from in vitro studies in NaCl demonstrated an improvement in the corrosion resistance. In addition, coatings were obtained by a two-step anodization procedure, firstly anodizing in an electrolyte solution containing sodium fluoride and secondly in an electrolyte solution with hexamethylenetetramine and mannitol, respectively. Results showed that the first layer acts as a protective layer which improves the corrosion resistance in comparison with the samples with a single anodizing step. In conclusion, these coatings are promising candidates to be used in biomedical applications in particular because the components are non-toxic for the body and the rate of degradation of the surface coating is lower than that of pure magnesium.

Correlation of Surface Alloyed Microstructure of Pure Magnesium With its Corrosion Behavior

2012 ◽  
Vol 472-475 ◽  
pp. 161-164
Author(s):  
Yu Gao Liu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Diffusion Time ◽  
Point Of View ◽  
Pure Magnesium ◽  
Corrosion Mechanism ◽  
Cross Sectional ◽  
Microstructure Characteristics ◽  
Solid Diffusion

This paper represents a summary of experimental results dealing with the time dependence of surface diffusion alloyed microstructure and its corrosion behavior at given temperature. The experiments were performed at 485°C for different solid diffusion time (6h, 12h, 18h ) and thus the surface alloyed microstructure of pure magnesium has been obtained. Optical and electrical microscopy and EDS compositions analysis were used to examine the cross sectional microstructure characteristics of alloyed layers of treated samples. It is shown that the new phases formed and its continuity, depending on the diffusion treated time at given temperature, have a noticeable influence on corrosion resistance and corrosion mechanism. The new formed phase Al5Mg11Zn4 was inert to the chloride solution compared with pure magnesium and acted as a corrosion barrier. It was concluded that the continuous Al5Mg11Zn4 phase was beneficial from the point of view of corrosion resistance.

Double Sealing of Ultrasonic Micro-Arc Oxidation Coating on Pure Magnesium by Nano-SiO2 Particles and SiO2 Sol Sealing Agent

2014 ◽  
Vol 1030-1032 ◽  
pp. 48-51
Author(s):  
Wei Wei Sun ◽  
Mu Qin Li ◽  
Yan Gao ◽  
Jiang Liu
Keyword(s):  
Corrosion Resistance ◽  
Bone Growth ◽  
Corrosion Current ◽  
Pure Magnesium ◽  
Infrared Spectrometry ◽  
Nano Sio2 ◽  
Micro Arc Oxidation ◽  
Sio2 Particles ◽  
Si Content ◽  
Sealing Coating

A double sealing coating was prepared on ultrasonic micro-arc oxidized pure magnesium substrate by adding nano-SiO2 particles as additive in the plating solution and coating SiO2 sol as sealing agent. The bonding characters of SiO2 sol was analyzed by Fourier transformed infrared spectrometry (FTIR). The compositions and morphology of seal coating were characterized by energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM), respectively. The corrosion resistance of the micro-arc oxidized and the sealed pure magnesium substrate were studied. The results showed that the Si content increased gradually with the addition of nano-SiO2 particles and the SiO2 sol sealing. It was benefit to create bioactive MgSiO3, which promoted the bone growth. The double sealed pure magnesium had a self-corrosion potential shifted positively by 60mV as well as a self-corrosion current density decreased by a half in a 3.5wt% NaCl solution, showing good corrosion resistance.

Lithium-modified MAO coating enhances corrosion resistance and osteogenic differentiation for pure magnesium

2021 ◽  
Vol 22 ◽  
pp. 100805
Author(s):  
Jiu-zao Lin ◽  
Wei-dong Chen ◽  
Qiang-qiang Tang ◽  
Luo-yuan Cao ◽  
Sheng-hui Su
Keyword(s):  
Corrosion Resistance ◽  
Osteogenic Differentiation ◽  
Pure Magnesium

scholarly journals Cathodic nitriding and anodic polishing of Ti6Al4V alloy by plasma electrolysis

2021 ◽  
Vol 2144 (1) ◽  
pp. 012033
Author(s):  
I V Tambovskiy ◽  
R A Vdovichenko ◽  
R D Belov ◽  
A D Dyakonova ◽  
R V Nikiforov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Combined Treatment ◽  
Ti6al4v Alloy ◽  
Surface Microhardness ◽  
Plasma Electrolysis ◽  
Ringer’S Solution ◽  
Ti6al4v Titanium Alloy ◽  
Modified Layer ◽  
Plasma Electrolytic

Abstract The paper presents the results of studies on modifying the surface of Ti6Al4V titanium alloy by combined exposure to cathodic nitriding and anodic polishing in electrolysis plasma. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. The effect of combined treatment on corrosion resistance of Ti6Al4V alloy was examined by means of potentiodynamic polarization in Ringer’s solution. It has been established that cathodic nitriding at 750 °C for 10 min leads to the hardening of the surface layer up to 820 HV with an increase in roughness by 2 times and wear resistance almost 3 times. Subsequent anodic plasma electrolytic polishing of the nitriding surface in solution of ammonium sulfate leads to a decrease in roughness and friction coefficient with an increase in corrosion resistance.

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