Electrochemical Corrosion Properties of YSZ Coated AA1050 Aluminium Alloys Prepared by Aerosol Deposition

Abstract

Yttria stabilized zirconia (YSZ) coating was formed on AA1050 Al alloys by aerosol deposition (AD), and its electrochemical corrosion properties were investigated in 3.5 wt% NaCl and 0.5 M H 2 SO 4 solutions. The crack-free, dense, and ~5 µm thick YSZ coating was successfully obtained by AD. The as-deposited coating was composed of cubic-YSZ nanocrystallites of ~10 nm size. The potentiodynamic test indicated that the YSZ coated Al alloy had much lower corrosion current densities (2 nA/cm 2 ) by comparison to uncoated sample and exhibited a passive behavior in anodic branch. Particularly, a pitting breakdown potential could not be identified in H 2 SO 4 . EIS tests revealed that the impedance of YSZ coated sample was ~106 Ωcm 2 in NaCl and ~10 7 Ωcm 2 in H 2 SO 4 , which was about 3 or 4 orders of magnitude higher than that of uncoated sample. Consequently, the corrosion resistance of Al alloy had been significantly enhanced by the YSZ coating.

Corrosion Protection Performance of YSZ Coating on AA7075 Aluminum Alloy Prepared by Aerosol Deposition

“…1C). 34,38,40,41 The coating had a relatively uniform thickness of ∼5 μm, and no pores or cracks were found in the cross-sectional view (Fig. 1D).…”

“…[36][37][38][39] Recently, the corrosion protection of AZ31 magnesium (Mg) alloy and AA1050 aluminum (Al) alloys was significantly enhanced by AD coating. 40,41 In this study, yttria stabilized zirconia (YSZ) was coated on AA7075 Al alloy by AD method, and its electrochemical corrosion properties were examined in acidic (0.5 M H 2 SO 4 , pH 1.5) neutral (3.5 wt% NaCl, pH 7.0), and basic (0.1 M KOH, pH 13) solutions by potentiodynamic and electrochemical impedance spectroscopy (EIS) tests.…”

Mechanical integrity of ceramic coatings on Kapton made by a dry aerosol deposition of lunar mare simulant

“…The primary particle size of the DAD LMS is less than 100 nm, significantly reduced from feedstock particle size, thus confirming particle impact fracture and in situ comminution during aerosol deposition. The relatively high peaks and deep valleys on the micron scale (referred to as cratering) are typical of the aerosol deposition method 42 . Figure 5 shows SEM cross‐sectional images.…”

“…The relatively high peaks and deep valleys on the micron scale (referred to as cratering) are typical of the aerosol deposition method. 42 Figure 5 shows SEM cross-sectional images. In Figure 5A, the full film thickness can be seen with the Kapton substrate at the bottom of the image.…”

Fabrication and Properties of Micro- and Nanostructured Coatings Using Electrochemical Depositions

“…These factors, especially the electrical current density in the unit surface of the cathode, determine the deposition rate. The electrical current distribution in lumps of cathodic surfaces are more than recesses, and this change in current density affects metal distribution, as the thickness of coating deposition corresponds with the current density (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33).…”