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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Castor oil is a shelter for Aluminium

Monday, 16 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Castor oil is a shelter for Aluminium

Tuesday, 29 January 2013

Latest results show that a sustainable corrosion protection coating based on castor oil works very well.

Good adhesion and very well corrosion protection is the result of the castor oil based coating

Source: Fotolia/Jenson

Good adhesion and very well corrosion protection is the result of the castor oil based coating

Source: Fotolia/Jenson

Because of its drought resistance, castor oil plants are primarily cultivated in sites that are unsuitable for other useful plants, especiall food plants.

Márcia Martinelli and her colleagues from the Instituto de Química, Universidade Federal do Rio Grande do Sul in Brazil took the epoxidized castor oil for further investigations.

The researchers prepared two series of organic–inorganic hybrid films from epoxidized castor oil (ECO) and the inorganic precursor titanium(IV) isopropoxide (TIP). The TIP was combined with silicon precursors, either 3-aminopropyltriethoxysilane (APTES) or tetraethoxysilane (TEOS) with different organic to inorganic proportions.

Good adhesion and very well corrosion protection

They pre-cured the films at room temperature under an inert atmosphere and subsequently submitted them to thermal curing.

All of the films exhibited good adhesion to the aluminum surface. Aluminum coated with the films and submitted to intensive corrosion test presented excellent protection.

Determination of the performance of ECO

The macro- and microscopic properties of the films, including

  • adhesion,
  • hardness,
  • microstructure (SEM)
  • and thermal properties

were determined as a function of the proportion of ECO to inorganic precursors.

Morphological studies showed that the hybrid films were microscopically homogeneous.

Results of TIP-addition

The addition of TIP decreases substantially the curing time.

The hardness and tensile strength of the films increased with increased concentration of inorganic precursor.

The combination of the silicon-rich inorganic precursors with TIP improved substantially the mechanical strength of the films.

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