Corrosion behavior of zn-al layered double hydroxide superhydrophobic films directly grown on aluminum
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
Superhydrophobic surfaces with contact angles over 150° and contact angle
hysteresis under 10° have aroused attention because of the potential applications
in self-cleaning and anticorrosion coatings. The corrosion resistance comes from
the permeation of ions into the metallic surface that can be minimized by the air
pockets formed on the solid-liquid interface [1].
Layered double hydroxydes (LDHs) are brucite-like materials charged positively
layers with anions interlayers wich are superhydrophilic micro-nanostructure that
can be transformed into a superhydrophobic one after treated by a low energy
surface agent like saturated fatty acid [2].
In this work, plates of 1100 aluminum and 6061 aluminum alloy (20x20x2mm3)
were mechanically polished by 600# and 1200# sanding papers and
ultrasonically cleaned in acetone for 10 minutes and after in isopropyl alcohol for
the same time. Subsequently, the plates were immersed into a solution of 0,1M of
Zn(NO3)2.6H20 in distillated water with 4 mL of ammonia and then heated at 70°C
for 3h, then immersed in a 1 wt% ethanol solution of stearic acid for 90 minutes
and dried at 80°C for 1h.
The resulting microstructure of the films was observed by SEM. Polarization
curves were produced when the plates were immersed in 3,5%wt NaCl solution at
room temperature.
Afterwards, both aluminum plates showed superhydrophobicity. The Zn-Al LDH
films showed curved platelets and flower-like structures. The corrosion density for
the uncoated 1100 and 6061 aluminum alloys were 3.7 and 8.4 μA/cm2,
respectively. For the same coated samples the corrosion densities were almost
one order of magnitude less: 0.33 and 0.45 μA/cm2 for 1100 and 6061 alloys,
which demonstrate the better corrosion behavior of the treated samples.
Como referenciar
SILVA JUNIOR, JOAO LUIS da; PIMENTEL, HUGO F.; ARAUJO FILHO, OSCAR O.; PILLIS, MARINA F.; ARAUJO, EDVAL G. Corrosion behavior of zn-al layered double hydroxide superhydrophobic films directly grown on aluminum. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 999. Disponível em: http://repositorio.ipen.br/handle/123456789/27343. Acesso em: 27 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.