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1090 aluminum alloy for anodizing
1090 aluminum alloy for anodizing is the highest grade aluminum alloy product widely used in the field of lighting and decoration with industrial pure aluminum (aluminum purity is 99.90%, generally no more than 99.93%) as the base material. According to its service state, it is divided into soft (including semi soft) products for anodizing and hard products for anodizing, among which 1090 soft (including semi soft) products are used for anodizing, Represented by 1090 reflectors (also known as reflectors in China), the products are characterized by high brightness and high molding ability, and are widely used in the field of indoor, outdoor and traffic lighting; The 1090 hard state products for anodizing are represented by 1090 mirror panels (1085 mirror panels used by aalco in Germany are products whose Ti content exceeds the control range of BSEN 573-3-2009, and their base metal aluminum purity is > 99.90%, so they are included in the category of 1090 aluminum alloy in the industry). The products have the quality characteristics of high brightness and no shading, and are widely used in high-end transportation, decoration Indoor and outdoor lighting and other fields. At present, the domestic aluminum alloy products in the field of traffic lighting decoration are concentrated in the middle and low-end 1070, 1050, 1060 and other aluminum alloys, with a reflectance of 60 ~ 70%. The processing methods of these products are not only DC (hot milk) processing method, but also CC (cast milk) milk production method. The lack of this core technology and disorderly competition in the domestic market, This has not only led to an increase in the investment risk of domestic enterprises in developing 1090 high-end anodizing materials, but also stalled the pace of developing high-end anodizing products in China.
The main processing flow of hard 1090 aluminum alloy for anodizing needs to go through ten main links: ingot casting, ingot sawing and milling, ingot homogenization and thermal processing, ingot cold processing, plate thick material cleaning, plate intermediate heat treatment, plate mirror processing, plate tension straightening and trimming, plate cleaning and coating, plate anodizing, etc. However, in terms of technical difficulty, the four links before mirror processing, such as plate ingot casting, plate ingot hot processing, plate ingot cold processing and intermediate heat treatment, are the core technologies of the whole industry, and these four links still have an internal relationship of mutual restriction and balance. Specifically, the typical technical route of hard 1090 products for anodizing is as follows:
Slab ingot casting slab ingot sawing and milling panel ingot homogenization hot milk cold milk intermediate annealing mirror milk stretch straightening cutting edge cleaning coated anodized finished product
The processing flow of soft 1090 aluminum alloy for anodizing products is different from that of hard products to a certain extent due to the obvious differences in use and usage. The most typical processing flow mainly includes: slab ingot casting, slab ingot sawing and milling, slab ingot hooking and hot processing, slab ingot cold processing, coil cleaning, coil annealing, coil opening, plate stamping The nine major links such as anodizing, the technical core of the whole industry, are still concentrated in several core links such as plate and ingot casting, plate and ingot homogenization and thermal processing, and plate and ingot surface treatment. Specifically, The typical technical route of soft 1090 aluminum alloy products for anodizing is as follows: plate ingot casting, plate ingot sawing and milling, panel ingot homogenization, hot emulsion cold emulsion cleaning, annealing, plate opening, stamping (or spinning) to form anodized products
The 1090 aluminum alloy for anodizing product has two very clear technical indicators, namely, high reflectance (known as brightness in the industry and characterized by mutually opposite specular reflectance and diffuse reflectance) and shading that does not affect the uniformity of reflectance after anodizing. The factors affecting the reflectance are mainly concentrated in five aspects: the grain size of plate ingot, the purity of plate ingot aluminum, the uniformity and density of oxide film after oxidation, the uniformity and consistency of rough surface and the control of interface state of mirror processing; The main factors affecting shading defects are concentrated in three aspects: surface and interface uniformity, raw material surface cleanliness and interface state control accuracy during mirror processing. The interface state control accuracy during mirror processing is concentrated in three technical indexes that affect and balance each other: absolute reduction control, plate type control and lubrication state control.