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This study describes the functionalization of a hybrid sol-gel polymeric coating with MOLY or ZAPP corrosion inhibitors and viable endospores of Bacillus licheniformis isolate (B6).
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Protective polymeric coatings containing active biocides are an approach to address material loss due to corrosion and fouling of steel surfaces. Tests were done on a hybrid epoxy-siliconized coating was synthesized and embedded with biocides.
Brief Background Throughout the last decades, coatings science has incorporated very versatile inorganic materials into organic coating to form the inorganic/organic hybrid coating systems. Combining various organic and inorganic constituents in combination with different preparation and processing methods, very versatile materials can be produced for optical, structural and coatings applications. The hybrid products have combined the properties of the inorganic materials, i.e., hardness, durability, and thermal stability, and organic polymers, i.e., flexibility and toughness.
Exterior decorative aerospace livery coatings are designed to be resistant to UV degradation as well as inert to a variety of aggressive solvents and airplane fluids to ensure adequate protection of the airframe. These coatings are also used to project a commercial airline’s identity using multiple overlapping colors in complex designs
Sol-gel coatings offer excellent properties such as scratch resistance, barrier properties, outdoor stability and high thermal stability. However, the precursors (silanes) used for these coatings are very expensive and require special care for handling and application on substrate. One approach to solve this problem is the incorporation of conventional organic polymer as the organic modifying component in silane coating formulation. Incorporation of organic polymer will reduce the cost and will make sol-gel coatings readily acceptable in industry.
Aircraft reliability and maintainability are critical to their availability and operation. One of the biggest threats to aircraft availability is corrosion of aircraft systems. The annual cost of corrosion for Air Force aviation and missiles is estimated to be $5.67B dollars, or 23.6% of total maintenance costs for this equipment, and 2.1 million non-available hours. It is estimated that for defense acquisition programs 60 – 80% of the total life cycle cost is associated with the operation and support (O&S) phase.
The surface properties of metals can be modified by using thin hybrid coatings without changing the metallic look of the surface. These properties include for example anti-fouling, abrasive resistance and corrosion resistance.
As far as the automotive sector is concerned, braking discs (BDs) are objects usually made of Grey Cast-Iron (GCI), i.e. a material exhibiting overall good mechanical properties and castability, but poor corrosion resistance. In particular, looking at the standard working conditions of a disc brake system, several environmental factors can cause and enhance GCI corrosion phenomena, such as: i) atmospheric moisture; i) ionic species contained in aerosols (e.g., chlorides and sulfates); iii) air differential corrosion caused by discs surface soiling by mud or other materials; and iv) galvanic coupling between the rotor and the braking pads.
Waterborne coatings are of growing importance in appliance, automotive refinish, concrete, traffic marking and high performance coatings due to increasing environmental regulation to reduce volatile organic compounds (VOC) and ease of handling. The resins commonly used for conventional solvent borne coating are usually modified by increasing their hydrophilic nature prior to being incorporation into a waterborne coating formulation.
Fouling and corrosion of heat exchangers poses a challenge for oil and gas operators. Here we describe recent efforts to develop and deploy thin, sol-gel-derived coatings to mitigate fouling and promote continuous operation of exchangers without compromising heat transfer efficiency.