Sealing of PEO Coated AZ91 Magnesium Alloy Using La-Based Solutions

Figure 6

Scanning electron micrographs (backscattered electrons) of the surface and cross section of PEO coating formed on AZ91 magnesium alloy. The sample was treated at 0.5 A/cm² for 2 minutes in an aqueous alkaline solution with 50 g/l of Na₂SiO₃, 40 g/l of NaOH, and 50 g/l of Na₅P₃O₁₀.