Aluminum industry | Surface pretreatment process for anodizing of aluminum profiles

by:Zeyi     2021-07-30
The basic process flow of anodizing treatment of aluminum profiles is: surface pre-cleaning-anodic oxidation treatment-coloring treatment-sealing treatment.  Surface pretreatment is mainly to eliminate grease and impurities on the surface of aluminum profiles. Generally, it goes through several steps of degreasing (degreasing), alkaline washing, neutralization, and water washing, and polishing treatment can be carried out if necessary. Degreasing generally uses 4%-10% sodium hydroxide solution to remove impurities and ash, neutralization generally uses sulfuric acid or nitric acid for acid leaching cleaning, and water cleaning uses cold water or double cleaning with hot water and cold water. After surface pretreatment, it can enter the formal anodizing process.  The film thickness problem of aluminum profile   In order to strengthen the protection of the base material of aluminum profile, some surface treatment is usually carried out. Different surface treatment film thicknesses are distinguished according to actual needs. The unit of film thickness is generally expressed in μm (micrometer), usually referred to as μ. The editor now describes several commonly used surface treatment film thicknesses as follows:   1. Aluminum alloy anodized surface treatment film thickness:    Aluminum profile surface oxide film thickness, according to the needs of use, mainly divided into 4 grades, namely AA10, AA15, AA20 , AA25, that is, the average surface film thickness of the aluminum alloy profile is 10μm, 15μm, 20μm, 25μm, and the local thickness is not less than 8μm, 12μm, 16μm, 20μm.   Second, aluminum alloy powder spraying surface treatment film thickness: aluminum alloy powder spraying surface coating film thickness is generally not classified, usually the average film thickness is not less than 40μm, local not less than 35μm. 3. Aluminum alloy fluorocarbon spraying surface treatment film thickness:    aluminum alloy fluorocarbon spraying surface film thickness, the surface coating is usually divided into two types: 2 coating 1 baking and 3 coating 2 baking, the average film thickness of 2 coating 30μm,3 The average film thickness of the coating is 40μm, and the local film thickness is not less than 25μm and 34μm respectively.   Fourth, aluminum alloy electrophoresis surface treatment film thickness:    aluminum electrophoresis surface film thickness is generally divided into three levels: A, B, S three levels.   Grade A: 12μm oxide film + 9μm electrophoresis film, the composite film thickness is not less than 21μm locally.   Grade B: 9μm oxide film + 7μm electrophoresis film, the composite film thickness is not less than 16μm locally.   S grade: 6μm oxide film + 15μm electrophoresis film, the composite film thickness is not less than 21μm.  Of course, customers can negotiate the film thickness with the manufacturer according to actual use needs, so that the aluminum profile can be used more specifically. Generally speaking, the thicker the film thickness, the better the protection of the aluminum profile substrate.
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