In order to improve the decorative effect of the exterior wall of aluminum plate, enhance the corrosion resistance and extend the service life, aluminum plate is generally treated, and aluminum surface treatment has become an essential important production link in the process of aluminum processing. Fluorocarbon spraying is one of the important aluminum surface treatment methods
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What is fluorocarbon（PVDF） spraying on aluminum plate
PVDF spray coating is a high-grade surface coating process, with excellent anti-fading, anti-blooming, anti-corrosion of atmospheric pollution (acid rain, etc.), strong anti-ultraviolet ability, strong crack resistance and can withstand bad weather conditions. Commonly used in outdoor large-area aluminum curtain wall projects. The coatings are made of PPG in the United States, Valspar in the United States, AkzoNobel in the Netherlands, KCC in South Korea, and other well-known products. The coatings are divided into two coatings and one baking, three coatings and one baking, four coatings and two baking. , hylur500 based pvdf PVDF paint can be used for 25 years without fading.
Technical requirements and standards for PVDF spraying
Fluorocarbon spraying is a high-end surface coating process. The quality requirements of the whole process are extremely strict. Except that the fluorocarbon coating manufacturer needs to obtain a quality license to produce the fluorocarbon coating based on Kynar 500, the entire surface treatment of the coating manufacturer is used. The technological process, including the pretreatment process, the spraying process and the curing process, require strict quality control to ensure the quality of aluminum coating.
In the fluorocarbon spraying industry, the main basis is the American Building Manufacturers Association standard AAMA-605.02.90. This spraying standard is recognized as the main international standard for inspecting the quality of the coating. In the AAMA standard, South Florida is mentioned as the test standard in many places, because the climate there is famous for its humidity, high temperature and direct sunlight, so it is considered to be a harsh environment for coating quality inspection.
Equipment and process flow
The performance of the fluorocarbon coating itself is determined, and the spraying equipment must ensure excellent atomization effect to ensure the uniformity of the sprayed layer. The distribution of metal particles in the fluorocarbon coating directly affects the appearance of the coating. The coating is uniform, and the high-quality fluorocarbon coating has metallic luster, bright color and obvious three-dimensional effect. And the fluorocarbon spray coating with inappropriate spray equipment will produce uneven color, shadow on the surface or weak coating. It greatly affects the decorative effect of fluorocarbon. In order to achieve a good spraying effect, high-voltage electrostatic electric spray guns are used.
The fluorocarbon spraying process mostly adopts multi-layer spraying to give full play to the advantages of Kynar 500 metallic paint in terms of durability and weather resistance. Strict quality control is required from the front surface treatment of aluminum to each spraying process, and the final product must be made in the United States Industry Association AAMA-605.02.90 Standard.
The fluorocarbon spraying process is as follows:
Pre-processing process:
Degreasing and decontamination of aluminum material→water washing→alkali washing (degreasing)→water washing→pickling→water washing→chromization→water washing→pure water washing
PVDF Spraying process:
Two coats and one bake: primer coat→top coat coat→baking (180-250℃)→packaging
(time required for production cycle: 4 hours)
Three coats and one bake: primer coating → metal topcoat coating → varnish coating → baking (180-250℃) → packaging
(time required for production cycle: 4 hours)
Four coats and two bakes: primer coating → barrier paint → baking (180-250℃) → topcoat coating (metal topcoat) → varnish coating → baking (180-250℃) → packaging
(time required for production cycle: 6 hours)
Fluorocarbon spraying process details
- The purpose of pre-treatment: before the aluminum alloy profiles and plates are sprayed, the surface of the workpiece should undergo degreasing, decontamination and chemical treatment to produce a chromed film, increase the bonding force between the coating and the metal surface and anti-oxidation ability, which is conducive to prolonging the paint The useful life of the membrane.
- Primer coating: As the primer coating of the closed substrate, its function is to improve the penetration resistance of the coating, enhance the protection of the substrate, stabilize the metal surface layer, and strengthen the adhesion between the topcoat and the metal surface, which can ensure the surface The color uniformity of the paint coating is generally 5-10 microns thick.
- Topcoat: The topcoat is the key layer of the spray coating. It provides the decorative color required by the aluminum material, so that the appearance of the aluminum material meets the design requirements, and protects the metal surface from the external environment, the atmosphere, acid rain, and pollution. , to prevent UV penetration. Greatly enhances the anti-aging ability. The top coat is the thickest layer of paint in spraying, and the thickness of the paint layer is generally 23-30 microns.
- Overcoat paint coating: Overcoat paint coating is also called varnish coating. The main purpose is to more effectively enhance the paint layer’s resistance to external erosion, protect the topcoat coating, increase the metallic luster of the topcoat color, and make the appearance more vivid. Dazzling, the coating thickness is generally 5-10 microns. The total thickness of the three-spray coating is generally 40-60 microns, and can be thickened if required.
- Curing treatment: The three-spray coating generally needs secondary curing. The aluminum material enters the curing furnace for treatment. The curing temperature is generally between 180 °C and 250 °C, and the curing time is 15-25 minutes. paint, providing optimum temperature and time. Some fluorocarbon spraying plants (curium oil plants) also change the two-time curing of three sprays to one-time curing according to their own experience.
- Quality Inspection: Quality inspection shall be in accordance with AAMA-605.02.90 standard. Strict quality inspection can ensure high-quality spray products.
Summary:
Surface anti-corrosion is very important for aluminum panel exterior wall projects. The current direct and effective anti-corrosion measure is to apply anti-corrosion coatings. The use of fluorocarbon paint to prevent corrosion of aluminum plates, each construction link must be operated in strict accordance with the requirements, surface treatment is the premise of painting, which has a great impact on the anti-corrosion effect and service life; the design of the supporting system scheme needs to be related to the corrosion of the aluminum plate. Consistent with the environment, with targeted protection.
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