Antibiofouling Properties of Sol-Gel Type Polymers for Aluminium Alloys: Biocorrosion Protection Against Pseudomonas Aeruginosa

作者：Vejar N D^*; Azocar M I; Tamayo L A; Gonzalez E; Pavez J; Gulppi M; Zagal J H; Zhou X; Santibanez F; Thompson G E; Paez M A

来源：International Journal of Electrochemical Science, 2013, 8(11): 12062-12077.

• aluminium
• alloy
• microbiological corrosion
• polymer coatings
• antibiofouling

The antibiofouling ability of three hybrid sol-gel coatings against P. aeruginosa for the protection of AA2024-T3 aluminium alloy has been investigated. The polymers were synthesized by mixing tetraethoxysilane (TEOS) with three precursors: (a) triethoxypropylsilane (TEPRS), (b) triethoxypentylsilane (TEPES) and (c) triethoxyoctylsilane (TEOCS). The main difference between the three precursors is the length of the aliphatic chain of one of the substituents. The antibacterial properties of the polymers were examined using viability techniques. The morphology of the polymers was characterized using scanning electron microscopy (SEM). The resistance of the AA2024 alloy coated with the respective polymers to microbiologically influenced corrosion was evaluated by potentiodynamic polarization. The results showed that the polymers possess antibacterial ability against P. aeruginosa and that the length of the aliphatic chain of the precursors does not significantly affect this property. Further, the electrochemical measurements revealed that the coatings inhibited microbiologically influenced corrosion in the mixture of P. aeruginosa and 0.1 M NaCl, due to the antibacterial properties of the polymers. A correlation between the degree of protection and the length of the aliphatic chain was revealed. Thus, the longer the chain length, the greater the protective effect. The antibiofouling ability resides mainly on the hydrophobic characteristic of polymers and the pH change occurring at the polymer-electrolyte interface when the coated aluminium alloy was immersed in the electrolytes.

• 出版日期2013-11