Abstract
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 0.1M Ca(NO3)2.4H2O + 0.06M NH4HPO4 + 10 ml.dm-3of 50 vol.% H2O2. The influence of the DCPD coating on electrochemical characteristics was examined using potentiodynamic polarization (PD) tests and electrochemical impedance spectroscopy (EIS) at the temperature 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.
Highlights
Magnesium and its alloys are the lightest structural materials and in combination with their excellent specific strength and recyclability they are a very popular choice of engineers in automotive and aerospace industry [1,2,3,4]
The electrochemical corrosion characteristics of non-coated and dicalcium phosphate-dihydrate (DCPD) coated samples have been measured by potentiodynamic polarization (PD) tests and electrochemical impedance spectroscopy (EIS) measurements in 0.1M NaCl [28,29] solution at the temperature of 22±2 °C in three-electrode cell configuration
The corrosion ratercorr is continually proportional to the icorr values such that the corrosion rate is lower in case of the DCPD coated samples
Summary
Magnesium and its alloys are the lightest structural materials and in combination with their excellent specific strength and recyclability they are a very popular choice of engineers in automotive and aerospace industry [1,2,3,4]. The electrochemical corrosion characteristics of non-coated and DCPD coated samples have been measured by potentiodynamic polarization (PD) tests and electrochemical impedance spectroscopy (EIS) measurements in 0.1M NaCl [28,29] solution at the temperature of 22±2 °C in three-electrode cell configuration.
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