Marine Grade Aluminum and Paint for Boat
Due to the advantages of light weight, strong corrosion resistance, high metal strength, good weldability, and long life, the marine grade aluminum is widely used in the manufacture of ships and marine engineering equipment, which greatly promotes the development of the industry.
The chemical properties of aluminum and aluminum alloy are very active, but because it can form a dense and passivated oxide film with oxygen, its corrosion resistance is much better than that of steel. When aluminum alloy is used on ships, no matter where it is, it will be more or less in contact with seawater, or be attacked by seawater droplets and marine atmosphere, so it will be corroded to a certain extent.
The corrosion of marine grade aluminum sheet is a very complex process, which is not only affected by the environment, but also related to the properties of the alloy. For ships, the corrosion environment of different parts is different. The bottom of the ship is mainly affected by the osmotic erosion of natural seawater and the attachment of aquatic organisms, and the parts above the waterline are mainly affected by salt spray corrosion and atmospheric aging. So we need to do certain protection for the boats.
For the parts above the waterline, the marine paint for the aluminum boat should have good atmospheric aging resistance, good gloss retention and decoration, and have good compatibility with the primer.
Polyurethane topcoats, alkyd topcoats, acrylic topcoats, etc. can be used, and now polyurethane topcoats are usually used. With the continuous improvement of the performance requirements of coatings, fluorocarbon coatings or epoxy and acrylic modified fluorocarbon coatings with superior performance have also begun to be applied to the supporting coating system of aluminum alloys.
Micro-arc oxidation treatment is a new surface treatment technology emerging in recent years. It adopts higher energy density, introduces the anodic oxidation working area from the Faraday area to the high-voltage discharge area. Through the joint action of electrochemistry, thermochemistry and plasma chemistry, etc., a ceramic oxide film is formed on the surface of the aluminum sheet.
The surface of marine aluminum plates has its special requirements for coatings. It is very important to choose appropriate coatings and formulate appropriate matching for the anti-corrosion effect of aluminum alloy ships. As one of the big aluminum plate suppliers, Haomei Aluminum provides rich alloys of aluminum plates with marine certification.
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