Taguchi design applied to process parameters optimization of sol–gel anticorrosive films
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In order to obtain an anticorrosive film produced according to the sol–gel method for protection of steel alloys, some parameters of the process were tested, which resulted in a crackless film with effective corrosion protection. The parameters studied were sol formulation, aging time of the sol, withdrawal speed using dip-coating technique, and heat treatment temperature. After the conduction of preliminary experiments, the formulation with a molar ratio of TEOS:glycerol:NH4OH of 3:3:1 was selected, due to the lack of cracks when analyzed with an optical microscope. The evaluation of the other parameters (aging time of the sol, withdrawal speed after the immersion in the sol using dip-coating technique, and heat treatment temperature) was realized with the help of a Taguchi design. Aiming for the evaluation of the effectiveness of the corrosion protection, experiments of accelerated corrosion in sulfuric acid aqueous solution were conducted. The samples covered with the film aged in 96 h, heat treated at 150 °C, and with withdrawal speed of 10 cm.min−1 presented the most satisfactory results.
The molar rate of TEOS:glycerol:NH4OH of 3:3:1 presents a homogeneous and crackless film.
The use of glycerol as an additive is efficient in order to eliminate cracks when parameters of the process are optimized.
The parameters optimization according to the method of Taguchi is effective to enhance corrosion protection.
A crackless film is obtained after the optimization, propitiating the application of green alternatives, such as the production of xerogels and the use of lower heat treatment temperature.
KeywordsSol–gel Glycerol TEOS Dip coating Taguchi design
Compliance with ethical standards
Conflict of interest
The research was supported entirely by public resources and was conducted in a manner free of private or business interests. The authors declare that they have no conflict of interest.
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