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Protection against corrosion of magnesium alloys with both conversion layer and sol–gel coating

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Academic year: 2021

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Fig. 5b shows a SEM image obtained on a backscattered electron composition mode (BSE), in order to differentiate the present ele-ments: the magnesium substrate (light-gray), the hybrid coating (gray), the neodymium and zirconium compounds (white), and the
Fig. 11 shows the open circuit potential for the samples recorded during the immersion time in the 0.05 M NaCl corrosive solution.
Fig. 5. Cross-section SEM image of the El21 substrate coated with the hybrid sol–gel film, showing the precipitates of zirconium and neodymium
Fig. 15b shows duplex system at the end of the EIS tests. The pres- pres-ence of the conversion layer formed with 10 g L − 1 of H 3 PO 4 can be identified, as well as the corrosion products that formed under the duplex system
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