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Corrosion protection process for the surface of aluminum alloy official boats
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Release time:
2022-06-10
Aluminum alloy公务船 employs surface painting protection or the installation of anti-corrosion zinc blocks to prevent the attachment of shellfish, algae, and other objects to the hull, which can reduce the vessel's speed or accelerate the aging of the aluminum alloy.
Aluminum alloy government boatTo avoid the attachment of shellfish, algae, and other objects on the hull that may reduce the boat's speed or accelerate the aging of aluminum alloy, methods such as surface painting protection or installing anti-corrosion zinc blocks should be employed.
The main factors to consider during painting under climatic conditions are the surface condition of the aluminum alloy and the atmospheric environment during painting. Generally, painting should be conducted at temperatures between 5℃ and 32℃, with relative humidity below 85%. Painting should not be performed when the surface is affected by rain, fog, or snow. For special types of coatings, painting should be carried out according to the supplier's requirements or guidelines.
Environmental requirements for the painting process: All construction stages should monitor the temperature and humidity of the construction environment. The painting environment temperature should be between 5-35℃, with relative humidity below 85%. The surface temperature of the substrate should be more than 3℃ above the dew point, and temperature and humidity should be measured near the substrate. If the substrate temperature exceeds 40℃, construction is not recommended. Strictly follow the product's construction environment requirements. The surroundings of the aluminum alloy government boat hull should be free of dust, allowing for enclosed construction with good ventilation conditions. Before each spray painting, wet the surroundings of the hull with water to reduce dust.
The air compressor used for spray painting should ensure sufficient air pressure and capacity. The air should be cooled and separated from water vapor before entering the spray gun and airless spray machine to keep the compressed air free of moisture.
Attention should be paid to the following points during the spraying construction of aluminum alloy government boats:
a) Before starting the application of the coating, the applicator should check the spray gun and adjust it to produce an appropriate fan pattern;
b) Hold the spray gun so that the spray pattern is always perpendicular to the surface and maintain a uniform distance of 25 to 30 centimeters from the surface being coated, avoiding arc-like movements caused by hand and brain rotation;
c) The trigger should be pulled just before the edge of the surface to be coated and the nozzle in a straight line. The trigger should be fully pulled and the spray gun moved at a constant speed until reaching the other side of the object, then release the trigger, turn off the fluid, but continue moving the spray gun a distance until returning to the starting point, and when reaching the edge of the sprayed object, pull the trigger fully again and continue moving past the object;
d) The trigger should be activated while moving the gun, and similarly, it should be closed while moving:
e) Each spray pass should overlap the previous pass by 50%, ensuring an even coverage of the paint film: at corners, the spray gun should be aimed at the centerline of the corner to ensure uniform film thickness on both sides.
After the epoxy primer has fully cured (generally more than 24 hours), proceed with rough sanding (can use pneumatic or electric sanders), typically using 80#--120# sand discs or belts, ensuring that all primer surfaces are properly sanded.
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