Hydrophobic Mg–Al layered double hydroxide film on aluminum: Fabrication and microbiologically influenced corrosion resistance properties

• An Mg–Al layered double hydroxide film was fabricated.
• The aliphatic carboxylate modified film has a uniform hydrophobic microstructure.
• The hydrophobic film exhibits a high anti-microbiologically influenced corrosion activity.

Mg–Al layered double hydroxide films with an ab-oriented microstructure are fabricated in situ by urea hydrolysis using pure Al as both the substrate and Al source. After surface treatment with sodium oleate, sodium laurate, and sodium stearate, respectively, the surface of the film changes from hydrophilic to hydrophobic, which can be attributed to the aliphatic carboxylate films formed on the film surface. Scanning electron microscopy revealed that the unique microstructure of the precursor film can be inherited. The hydrophobic property of the sodium laurate and sodium stearate treated films can reduce the adsorption and adhesion of sulfate reducing bacteria and retard biofilm formation. The hydrophobic layered double hydroxide films obtained in the present work have excellent microbiologically influenced corrosion resistance activities that are due to the unique hydrophobicity microstructure and may be potentially be applied in microbiologically influenced corrosion resistance coatings.

The hydrophobization treatment can improve the microbiologically influenced corrosion resistance performance of the LDH film on Al.Figure optionsDownload as PowerPoint slide