چكيده به لاتين
Marine structures such as ships, oil platforms, and oceanographic systems are permanently at risk of fouling. Fouling adversely affects the performance of these structures; in a way that it may reduce or disrupt the efficiency of the systems. Antifouling paints are used to prevent fouling of marine structures. These paints being based on the release of toxins prevent fouling. The release of toxic substances of antifouling paints results in irreparable environmental problems. Therefore, new environmentally friendly approaches are attended to be replaced with antifouling paints. One of these environmentally friendly coatings is the hydrophobic coatings.
These coating, without the need for hydrodynamic force, can prevent sediment from settling. It also reduces drag forces significantly. These coatings can be used for short periods of time to protect specialized equipment and sensors. But one of the problems that can be identified for these coating is its impractical for large surfaces, as well as the costly technology of these coatings. In this thesis, in order to solve these problems, electrostatic spraying method has been used for the purpose of the deposition. This approach has increased the international community's approach to it, because of its benefits such as the high efficiency of their practices, energy savings, time and labor, higher rates of coverage and environmental compatibility. In this thesis, the electrostatic spray-coating method was used to fabricate super-hydrophobic coating of silica particles with micro and nano dimensions, which were hydrophobic with silanization method. These coating have a contact angle of 170 degrees and a hysteresis angle of less than 10 degrees and have high stability in the water. In order to evaluate these coverages, some conditions were provided in the laboratory to cultivate a marine sediment and achieve an initial assessment regarding these coatings. According to the ASTM standards for anti-fouling coatings, these coating were evaluated in both static and quasi-static environments. The results of this evaluation in static and quasi-static environment indicate the long-term inefficiency of these coatings in the static environment and the efficacy of these coatings for 15 days in a quasi-static environment.
