What are the differences in anti-corrosion treatment methods for different types of fiberglass spray towers?

The specific steps for anti-corrosion treatment of fiberglass spray tower are as follows:

preparation in advance

1. Safety protection: Set up safety warning signs to ensure the safety of the construction area. Construction personnel must wear protective equipment such as safety helmets, protective goggles, gloves, etc.

2. Surface cleaning: Use a high-pressure water gun or compressed air to remove dust, dirt, rust, and other impurities from the surface of the tower. For stubborn stains, sandpaper or wire brush can be used for polishing, but care should be taken to avoid damaging the surface of the fiberglass.

3. Defect repair: Check the surface of the tower for cracks, holes, wear and other defects. For smaller cracks, fiberglass special repair adhesive can be used to fill them; For larger defects, it is necessary to use fiberglass reinforced plastic materials for repair, such as laying fiberglass cloth and applying resin.

Primer application

1. Preparation of Primer: Accurately weigh and prepare the fiberglass special primer according to the product manual to ensure even mixing.

2. Brushing method: Brush or spray the primer evenly on the surface of the tower. When painting, attention should be paid to avoiding problems such as missed brushing, sagging, and bubbling. Generally, it is necessary to apply 2 to 3 coats, and the interval between each coat depends on the drying time of the primer, usually around 24 hours, to ensure that the primer forms a good sealing layer and enhances adhesion.

Intermediate paint application

1. Mixing intermediate paint: According to the product requirements, fully mix and stir the components of the intermediate paint evenly.

2. Brushing operation: After the primer is completely dry, apply the intermediate paint. Spraying can be used to achieve better coating uniformity and thickness consistency. Brush 2-3 times, with the interval between each coat determined by the drying time of the intermediate coat, usually 24-48 hours, to increase the thickness and anti-corrosion performance of the coating.

The anti-corrosion treatment methods for different types of fiberglass spray towers with topcoat coating are basically similar, but due to differences in application scenarios, contact media, and other factors, there may be differences in some details and material selection. The following are some common situations:

Classified by gas processing type

Acid gas spray tower

Material selection: Resin with strong acid resistance, such as vinyl ester resin, is usually selected, which has good resistance to various acidic media. Glass fiber cloth also needs to have acid resistance, and alkali free glass fiber cloth that has undergone special surface treatment can be used.

Anti corrosion treatment: In addition to conventional primer, intermediate coat, and topcoat application, it may be necessary to increase the thickness of the coating, especially the topcoat, to enhance its barrier performance against acidic gases. In addition, parts of the tower that frequently come into contact with acidic gases, such as sprinkler heads and packing supports, can be locally protected with more corrosion-resistant stainless steel or polytetrafluoroethylene materials.

Alkaline gas spray tower

Material selection: Epoxy resin with good resistance to alkaline media can be used as the resin. Glass fiber cloth should also consider its alkali resistance, and medium alkali glass fiber cloth can be selected.

Anti corrosion treatment: When applying anti-corrosion paint, attention should be paid to the adhesion between the primer and the fiberglass surface, as alkaline media may affect the adhesion of the coating. The number of coats of primer can be appropriately increased to improve adhesion. At the same time, the selection of intermediate paint should pay attention to its anti permeability performance to prevent alkaline gases from penetrating into the interior of the coating.

Classified by usage environment

Outdoor spray tower

Material selection: In order to resist the erosion of ultraviolet rays, the resin should have good weather resistance and can be supplemented with additives such as ultraviolet absorbers. Glass fiber cloth can be selected from products that have undergone weather resistance treatment on the surface.

Anti corrosion treatment: The topcoat should choose a coating with high weather resistance, such as fluorocarbon paint, which can effectively prevent the coating from powdering, fading and other phenomena under long-term sunlight exposure. In addition, the bottom of the outdoor spray tower body is easily affected by rainwater splashing and ground moisture, and it is necessary to strengthen the anti-corrosion treatment of the bottom. A layer of anti-corrosion putty can be added to the bottom or a thicker anti-corrosion coating can be used.

Indoor spray tower

Material selection: The requirement for weather resistance is relatively low, but the cleanliness and hygiene requirements of the indoor environment should be considered. Resin should be selected as low volatile and odorless products to avoid indoor air pollution.

Anti corrosion treatment: While ensuring the anti-corrosion performance, more attention should be paid to the surface flatness and smoothness of the coating for easy cleaning. High gloss topcoat can be used to prevent dust accumulation on the surface of the tower. At the same time, attention should be paid to ventilation during the construction process to ensure indoor air quality.

Classified by concentration of processing medium

High concentration medium spray tower

Material selection: The resin should have higher corrosion resistance, and high-performance special resins such as phenolic resin can be selected. The quality and number of layers of fiberglass cloth may also need to be increased to enhance the overall anti-corrosion performance.

Anti corrosion treatment: The thickness of the coating should be strictly controlled, generally thicker than the spray tower coating for low concentration media. At the same time, it is necessary to strengthen the quality inspection of coatings, such as increasing the frequency of adhesion testing and corrosion resistance testing, to ensure that coatings can withstand the erosion of high concentration media.

Low concentration medium spray tower

Material selection: Ordinary general-purpose resin and fiberglass cloth can be used to meet anti-corrosion requirements while reducing costs.

Anti corrosion treatment: The anti-corrosion treatment process is relatively simple, and the coating thickness can be appropriately reduced, but the basic anti-corrosion performance still needs to be ensured. On the premise of ensuring quality, the number of brushing passes can be appropriately reduced to improve construction efficiency.

1. Topcoat preparation: Prepare the fiberglass special topcoat according to actual needs and color requirements.

2. Painting process: After the intermediate paint is dry, apply the topcoat. Use spraying or brushing methods to evenly cover the surface of the intermediate paint with the topcoat. Generally, two coats are applied with an interval of about 24 hours between each coat to form a smooth, beautiful, and weather resistant outer coating.

Quality inspection and acceptance

1. Appearance inspection: Observe whether the coating surface is flat and smooth, and whether there are defects such as missed brushing, sagging, blistering, cracks, etc. The coating color should be uniform and consistent, with no obvious color difference.

2. Thickness detection: Use a coating thickness gauge to measure the thickness of the coating. The coating thickness of different parts should meet the design requirements and the deviation should be within the allowable range.

3. Adhesion testing: Use methods such as grid cutting or pulling to test the adhesion between the coating and the tower surface. The adhesion should meet the specified standards to ensure that the coating will not peel off during long-term use.

Post maintenance

1. Regular inspection: After the spray tower is put into use, the condition of the anti-corrosion coating should be checked regularly. If any damage or peeling of the coating is found, it should be repaired in a timely manner.

2. Avoid damage: In daily operation and maintenance, sharp objects should be avoided from scratching the surface of the tower to prevent damage to the anti-corrosion coating.

3. Environmental control: Try to control the environmental conditions of the spray tower as much as possible, avoid long-term exposure to high temperature, high humidity or highly corrosive media, in order to extend the service life of the anti-corrosion coating.