An optically transparent Li–Al–CO3 layered double hydroxide (LDH) film was formed on an AZ31 substrateby applying DC voltage between the cathode (AZ31) and the anode (stainless steel) in a Li+/Al3+aqueous solution. The film thickness increased with electrolysis time. The LDH-coated sample exhibitedlow corrosion rate in NaCl solution, which was consistent with the results from long-term corrosion testingin a high-humidity environment. The LDH film exhibited good corrosion performance, which mainlyresulted from its high hydrophobicity and its increased surface pH value during corrosion testing
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