5 documents found, page 1 of 1
As-cast and extruded Mg Zn Ca systems for biodegradable implants: Characterizat...
Moreno, Lara; Matykina, Endzhe; Yasakau, Kiryl A.; Blawert, Carsten; Arrabal, Raul; Mohedano, MartaThe aim of the present study is to evaluate the effect of alloy processing and composition as well as the pH control and testing medium on the in vitro corrosion performance of Mg –Zn –Ca systems for biodegradable implants. The grain size and secondary phases were analyzed by optical microscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Scanning kelvin probe force mi...
PEO of rheocast A356 Al alloy: energy efficiency and corrosion properties
Mohedano, Marta; Matykina, Endzhe; Arrabal, Raul; Mingo, Beatriz; Zheludkevich, Mikhail L.PEO coatings were developed under voltage-controlled mode on a rheocast A356 aluminum alloy without and with pretreatment by conventional anodizing in sulphuric acid. Microstructure and composition of uncoated and coated materials were studied using SEM, EDS and XRD. The anodic precursor oxide layer preserves the microstructure of the alloy because of the presence of secondary phases having a different behavior...
Plasma electrolytic oxidation coatings with particle additions - A review
Lu, Xiaopeng; Mohedano, Marta; Blawert, Carsten; Matykina, Endzhe; Arrabal, Raul; Kainer, Karl Ulrich; Zheludkevich, Mikhail L.Plasma electrolytic oxidation (PEO) processing for light metals is known for decades and has been established as a well-known industrial surface treatment offering a reasonable wear and corrosion protection. However, long-term protection is compromised by the intrinsic porosity and limited range of composition in the PEO layer. A novel approach is to introduce particles to the electrolyte, aiming at their in-si...
Influence of surface pre-treatment on the deposition and corrosion properties o...
Zhang, Yufen; Blawert, Carsten; Tang, Shawei; Hu, Jin; Mohedano, Marta; Zheludkevich, Mikhail L.; Kainer, Karl UlrichCalcium stearate based hydrophobic coatings were deposited on pre-treated Mg alloy substrates. The influence of four different pre-treatments including plasma electrolytic oxidation (as prepared and etched), anodizing and hydrothermal treatment was studied. The results indicate that the pre-treatments have strong influences on the morphology, thickness, and wettability of the coatings, without affecting their p...
Degradation behavior of PEO coating on AM50 magnesium alloy produced from elect...
Lu, Xiaopeng; Sah, Santosh Prasad; Scharnagl, Nico; Stoermer, Michael; Starykevich, Maksim; Mohedano, Marta; Blawert, Carsten; Zheludkevich, Mikhail. L.Amorphous plasma electrolytic oxidation (PEO) coating with sealed discharge channels can be formed in alkaline phosphate electrolyte containing montmorillonite clay particles. The effect of various concentrations of phosphate and hydroxide ions in the clay-containing electrolyte on the microstructure of the coatings was studied in the present work and correlated with the corrosion behavior. The clay particles w...