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Anodised Aluminium Signage

Anodised Aluminium Signage

Ceramics (oxides) are much harder than most metals, so to improve the scratch resistance of aluminum, “anodizing” is used to thicken the oxide layer.?

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 Aluminum is  used in industry because it has a good strength-to-weight ratio. Aluminum also has decent corrosion resistance because it has  a very strong affinity for oxygen, which forms a thin and tenacious oxide layer  on its surface and protects the underlying metal from further oxidation.  However, aluminum isn’t a very hard metal and can be  scratched fairly easily.  Ceramics  (oxides) are much harder than most metals, so to improve the scratch resistance  of aluminum, “anodizing” is used to  thicken the oxide layer.  The  thicker oxide layer also improves the metals corrosion resistance.


What is the  anodizing Process?
 Metals are  anodized by placing them in an acidic bath, often sulfuric acid, and the acid  corrodes the metal resulting in a very thick oxide (ceramic) layer on the metal  surface.  This oxide layer is porous, and  can be up to 50 µm thick (2  mils) and appear as different colors depending on its thickness.  Aluminum oxide is typically gray or black in color.  The porous surface oxide layer has to be “sealed” to  complete the process, and this is accomplished by submerging the sample in warm  water which hydrates the oxide and shrinks the pores.  Putting dyes in the water during the sealing process allows  the as the dye to permeate the oxide layer, this is how colorful products are  created.


Aluminum  details :

  • Alloy 5052  Temper H38

  • Chemical  Composition Limits (%)

Si

Fe

Cu

Mn

Mg

Cr

Ni

Zn

Ti

Others

Total

AL
     Min.

0.25

0.4

0.10

0.10

2.2-2.8

0.15-0.35

 

0.10

 

 0.05

0.15

 Remainder

Magnesium gives this  alloy its enhanced corrosion resistance, work ability, strength, and weld  ability. Typical uses include aircraft fuel tanks, electronic mounting plates  and panels, fan blades, refrigeration liners, storm shutters, and  utensils.     

  • Mechanical  Property Limits

Alloy
      Temper

Specified
     thickness

Tensile strength

Elongation
     in 2 inches %

Ultimate

Yield

 

inches

min

max

min

max

Yield

5052
     H38

0.006-0.007
     0.008-0.031
     0.032-0.128

39.0
     39.0
     39.0

-
     -
     -

32.0
     32.0
     32.0

-
     -
     -

2
     3
     4


Anodized  Aluminum advantage:

  • Protects satellites from the harsh  environment of space.

  • Used in one of the world's tallest  buildings --- the Sears Tower in Chicago, Illinois.

  • Provides attractive,  minimum-maintenance, highly durable exteriors, roofs, curtain walls, ceilings,  floors, escalators, lobbies and staircases in skyscrapers and commercial  buildings throughout the world.

  • Revolutionized the construction of  computer hardware, exhibit displays for trade shows, scientific instruments,  and a constantly expanding array of home appliances, consumer products, and  building materials.

  • Considered environmentally safe,  producing few, if any, harmful effects on land, air, or water.

 

氧化板 (2).jpg


 


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