scholarly journals Evolution of the dicalcium phosphate-dihydrate (DCPD) coating created by large amplitude sinusoidal voltammetry (LASV) on corrosion resistance of the ZW3 magnesium alloy in chloride containing environment

2018 ◽  
Vol 62 (1) ◽  
pp. 14-18
Author(s):  
D. Kajánek ◽  
B. Hadzima ◽  
F. Pastorek ◽  
M. Neslušan Jacková
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Large Amplitude ◽  
Electrochemical Impedance ◽  
Dicalcium Phosphate ◽  
Electrochemical Characteristics ◽  
Dicalcium Phosphate Dihydrate ◽  
Electro Deposition ◽  
Cathodic Electrodeposition ◽  
Phosphate Dihydrate

Abstract The contribution is focused on the preparation of coating based on the dicalcium phosphate-dihydrate (DCPD) on the surface of ZW3 magnesium alloy. For the preparation of the coating a cathodic electrodeposition technique called Large Amplitude Sinusoidal Voltammetry (LASV) was used. The DCPD layer was prepared at the temperature of 22 ± 2 °C in electrolyte composed of 0.1M Ca(NO3).4H2O, 0.06 M NH4H2PO4 and H2O2. Electrochemical characteristics were evaluated by electrochemical impedance spectroscopy (EIS) in 0.1M NaCl solution. The obtained data in form of Nyquist plots were analysed by the equivalent circuit method. It is clear from the measured values of polarization resistance Rp that dicalcium phosphate-dihydrate (DCPD) layer prepared by LASV electro-deposition technique improved corrosion resistance of ZW3 alloy in the chosen environment.

Preparation and Characterisation of CaP-Containing Coating on Magnesium Alloy by Micro-Arc Oxidation and Hydrothermal Treatment

2012 ◽  
Vol 496 ◽  
pp. 383-386
Author(s):  
Li Min Chang ◽  
Dan Dan Xu ◽  
Wei Liu
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Hydrothermal Treatment ◽  
Electrochemical Methods ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Phosphate Dihydrate ◽  
Micro Arc Oxidation ◽  
Hank’S Solution

Micro-arc oxidation (MAO) together with hydrothermal treatment had been performed to improve the corrosion resistance of magnesium alloy. The oxide films were hydrothermally heated at 150°C for 2h. The morphology of samples were characterized by SEM/EDS. The phase compositions were examined by TF-XRD. The corrosion resistance of the coatings was evaluated by electrochemical methods in Hank’s solution. The MAO films displayed porous and rough structure and were mainly composed of MgO and MgAl2O4. After hydrothermal treatment, a dicalcium phosphate dihydrate (DCPD) coating formed on the oxide film. The corrosion resistance of the MAO film and DCPD coating was increased by about 12 and 40 times higher than that of bare magnesium alloy.

scholarly journals Electrochemical Characterization of Az31 Magnesium Alloy Treated by Ultrasonic Impact Peening (Uip)

2018 ◽  
Vol 20 (3) ◽  
pp. 24-29
Author(s):  
Daniel Kajanek ◽  
Branislav Hadzima ◽  
Filip Pastorek
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Electrochemical Impedance ◽  
Az31 Alloy ◽  
Az31 Magnesium Alloy ◽  
Electrochemical Characteristics ◽  
Nyquist Plots ◽  
Eis Measurements ◽  
Testing Solution

Electrochemical characteristics of AZ31 magnesium alloy after impacting by ultrasonic impact peening (UIP) were measured in order to evaluate its effect on corrosion resistance of mentioned alloy. For this purpose, potentio-dynamic polarization (PD) tests and electrochemical impedance spectroscopy (EIS) of ground and impacted samples were performed in 0.1 M NaCl solution at the temperature of 22±2 °C after 5 minutes of potential stabilization. The obtained PD curves were analysed using the Tafel extrapolation method and data from EIS measurements in form of Nyquist plots were quantified by the equivalent circuit method. The results showed clearly that application of the UIP significantly deteriorated corrosion resistance of AZ31 alloy in the chosen testing solution.

scholarly journals ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY CHARACTERIZATION OF ZW3 MAGNESIUM ALLOY COATED BY DCPD USING LASV DEPOSITION TECHNIQUE

2017 ◽  
Vol 23 (2) ◽  
pp. 147 ◽  
Author(s):  
Daniel Kajánek ◽  
Branislav Hadzima ◽  
Filip Pastorek ◽  
Martina Neslušan Jacková
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Magnesium Alloy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Water Solution ◽  
Electrochemical Characteristics ◽  
Phosphate Dihydrate ◽  
Nyquist Plots ◽  
Eis Measurements

<p class="AMSmaintext"><span lang="EN-GB">The contribution deals with the preparation of the dicalcium phosphate-dihydrate (DCPD) coating on ZW3 magnesium alloy surface. The coating was prepared using large amplitude sinusoidal voltammetry (LASV) electrodeposition technique in water solution of </span><span lang="SK">0.1M Ca(NO<sub>3</sub>)<sub>2</sub>.4H<sub>2</sub>O + 0.06M NH<sub>4</sub>HPO<sub>4 </sub>+ 10 ml.dm<sup>-3</sup> of 50 vol.% H<sub>2</sub>O<sub>2</sub>. </span><span lang="EN-GB">The influence of the DCPD coating on electrochemical characteristics was examined using potentiodynamic polarization (PD) tests and electrochemical impedance spectroscopy (EIS) at the temperature <br /> </span><span lang="EN-GB">22 ± 2 °C in 0.1M NaCl. The obtained PD curves were analysed using Tafel extrapolation method and the data obtained by EIS measurements in a form of Nyquist plots were analysed quantitatively by equivalent circuit method. The results showed the increase of corrosion resistance after application of DCPD coating on ZW3 Mg alloy in sodium chloride solution. </span></p>

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