Degreasing Aluminum
Seidel’s environmentally conscious philosophy is applied to designing processes that produce no hazardous waste from the start. 
Anodizing AluminumRack AnodizingCreative FinishingCustom ColorsDecorating Aluminum

Rack Anodizing

Seidel exclusively offers rack anodizing with all racks made from titanium, specifically designed in-house to exceed all anodizing standards. Each component is individually loaded onto racks to allow for proper contact, which results in better quality parts. Each rack is transferred through approximately 30 processing tanks. The fully automated and tightly controlled process takes about 2 hours and  the principal steps are listed below… 
In house designed titanium racks.

Rack Anodizing Process overview

Loading on Racks
  • Each part is affixed on rack pins (manually or automatically)
  • Racks are made of titanium
  • Approximate rack size : 11.5 ft * 3.5 ft
  • Depending on part size, each rack holds
    between  20-12,000 parts
Manual assembly of aluminum parts.
  • Applying up to 10,000 Amps per rack dissolves the “tips of the mountains” on the surface of the aluminum
  • The result is a shiny finish on high purity aluminum (5657 alloy) or satin finish on low purity aluminum (e.g. 3005 or 9020 alloy)
  • The metal removal is tightly
    controlled (about 1 mil or
    25 micro-meter)
  • Parts are exposed to an alkaline solution which etches away the surface
  • Result is a matte finish

Fully automated anodizing tanks.
Anodizing (anodic oxidizing)
  • Aluminum creates on its surface a natural aluminum oxide (AI2O3), which protects the aluminum from disintegrating. Using these natural properties of the aluminum we increase the thickness of the AI2O3 in the anodizing process. This layer provides additional protection against corrosion and a surface which can be colored with dye
Additional technical information about the aluminum oxide:
    • hardness comparable to a diamond
           . diameter of the pores: 1/10 of the wavelength of light
           . thickness of AI2O3: from 2 to 25 micro-meter (80 micro-in to 1/1000 in)
    • enhanced abrasion resistance
    • pores can absorb dye coloring
         . the pores are 1000 times longer than they are wide
         . up to 400 billion pores/in2
  • The pores are extremely hard, non-conductive, corrosion resistant, abrasion resistant and transparent
  • Temperature controlled environmental conditions are essential to achieve consistency
  • The pores created in the anodizing process are now ready to absorb organic dyes. These dyes will be absorbed and integrated into the aluminum oxide and cannot be scratched off like paint. 
Extreme close up of the porous layer of oxide.
  • Seidel uses a proprietary hot water seal which closes the pores of the aluminum and traps the dye in the metal
  • We do not use nickel acetate seal for environmental reasons
  • Parts are dried with hot air in multiple convection ovens
Contact Us today to learn more about our Rack Anodizing process!