Weatherproof color shape bars in aluminium alloy, and manufacturing method

Abstract

The present invention relates to a superweathering color aluminum alloy section material and its production method. The composition of its base material is AlMg Si0.5-F22 alloy, according to Mg / Si=1.73, in which Mg (0.50-0.75%), Si (0.35-0.50%), Fe (less than 0.3%), Cu(less than 0.1%), Mn (less than 0.1%), Cr (less than 0.1%), Zn (less than 0.1%) and Ti (less than 0.1%); said base material is covered with chromized film whose thickness is 300-1000 mg / sq.m, and the chromized film also is covered with polyester powder coating layer which has imitation woodgrain pattern and whose thickness is 40-120 microns. Its production method includes the following steps: preparing aluminum alloy section base material, making pretreatment and chromizing process, spray-coating super weathering antistatic powder and heat transfer printing imitation woodgrain pattern.

Description

technical field [0001] The invention relates to the field of aluminum alloy profiles, in particular to an aluminum alloy profile that can maintain its surface color and performance for a long time and can have different colors and a manufacturing method thereof. Background technique [0002] Because aluminum alloy profiles are easy to obtain, easy to manufacture, and durable, they are currently a popular structural and decorative material for building doors and windows. [0003] However, aluminum alloy profiles without surface treatment are not decorative, and the existing surface treatment methods for aluminum alloy profiles mainly include: anodic oxidation; electrostatic powder spraying; electrophoretic coating and fluorocarbon paint spraying. [0004] These surface treatments have their own characteristics: the advantages of electrolytic anodized surface are low cost and long service life, and the disadvantages are less color and cold feeling of metal; the advantages of e...

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Problems solved by technology

[0004] These surface treatments have their own characteristics: the advantages of electrolytic anodized surface are low cost and long service life, and the disadvantages are less color and cold feeling of metal; the advantages of electrostatic powder spraying surface are rich colors, good look and feel, medium cost, and the disadvantage is weather resistance The durability is generally about ten years; the advantage of electrophoretic treatment is that it has richer colors and better appearance than electrolytic anodic oxidation treatment, but the disadvantage is that the treatment cost is slightly higher; the advantage of fluorocarbon is good weather resistance, and the disadvantage is that the coating is thin and the price is high

[0005] Although the aluminum profiles on the above surfaces have their own characteristics, they are still the most widely used color electrostatic powder sprayed aluminum profiles at present. However, since the service life of general buildings is more than 50 years, the doors and windows (profiles) as part of the building ) should also have the same service life in theory, and the only disadvantage of the existing color electrostatic powder sprayed aluminum profiles is that the weather resistance of the surface coating, that is, the service life cannot meet the requirements of buildings.