Everything You Need to Know About Anodizing Aluminum - PowerPoint PPT Presentation

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Everything You Need to Know About Anodizing Aluminum

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when you’re in need of metal prototypes or parts with superior mechanical properties and specialized aesthetic design, anodizing aluminum is an excellent option. The anodizing process forms a layer of oxide on a metal part, effectively increasing corrosion resistance, and also enhancing visual qualities and keeping the surface from being scratched. – PowerPoint PPT presentation

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Title: Everything You Need to Know About Anodizing Aluminum


1
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  • www.indacometalcoats.com
  • Aluminium Anodizing Titanium Anodizing Indaco
    Coats

2
Everything You Need to Know About Anodizing
Aluminum
  • when youre in need of metal prototypes or parts
    with superior mechanical properties and
    specialized aesthetic design, anodizing aluminum
    is an excellent option. The anodizing process
    forms a layer of oxide on a metal part,
    effectively increasing corrosion resistance, and
    also enhancing visual qualities and keeping the
    surface from being scratched.

3
  • Anodizing aluminum is an extremely durable
    post-processing method. Not only does it enhance
    the properties and appearance of a part, it
    enables better adhesion for paint primers and
    glues. This technique utilizes anodic films that
    provide unique aesthetic effects, such as
    transparent coatings that reflect light or thick
    coatings that can absorb dies.     

4
  • Despite having an impact on the mechanical
    capabilities of metal parts, anodizing aluminum
    will not take away from the natural appearance of
    the material. While the anodizing process can
    also be applied to other metals -such as
    titanium, zinc and magnesium- aluminum is by far
    the most widely used of the bunch.

5
  • As a part of 3ERPs extensive offering for
    premium surface finishes, you can utilize our
    anodizing aluminum service to enhance the
    functionality and look of your metal parts and
    prototypes. To help you make the right decision
    for post-processing, heres everything you need
    to know about anodizing aluminum. 

6
How the Process of Anodizing Aluminum Works
  • In order to properly anodize aluminum parts, the
    surface must first be cleaned and rinsed before
    getting placed into a bath of an electrolytic
    solution, primarily either sulfuric or chromic
    acid. This provides a electrically conductive
    coating that contains a number of positive and
    negative ions.  

7
  • So how does this process really work? Well, once
    the anodizing process is underway, a positive
    electric charge is sent through the aluminum,
    while a negative charge is applied to plates in
    the electrolyte. Basically, the electric current
    forces the positive ions to attract to the
    negatively charged plates while the negative ions
    are attracted to the aluminum part, which the
    positive anode.

8
  • From  here, the electrochemical reaction forces
    pores to open up on the surface of the aluminum
    so that the positive ions can escape. In a
    uniformly geometric pattern, these pores dig down
    into the substrate of the part. The combination
    of the aluminum surface and negatively charged
    ions create a barrier layer, which is known in
    the anodizing aluminum process as the surface
    layer the makes parts resistant to corrosion.
  • There are currently four different variations of
    the anodizing aluminum process, each of which
    offers distinct advantages over the other

9
  • Anodized Type I This is the most basic type,
    using chromic acid to produce a thin and ductile
    anodized layer on an aluminum part.
  •  
  • Anodized Type II Instead of using chromic acid,
    Type II utilizes sulfuric acid in order produce a
    thicker anodized layer on a part, making it more
    suitable for coloration.

10
  • Anodized Type III Similarly to Type II, this
    method also uses sulfuric acid, but produces a
    thicker anodized layer that is also suitable for
    coloration. Its also commonly known as hard
    anodizing.
  •  
  • Chemical Film / Alodine This method entails
    coating part with alodine to produce results that
    are comparable to anodization.
  •  
  • While chromic acid was widely used by
    manufacturers when the anodizing aluminum process
    was developed in the early 1900s, most parts are
    now anodized with the sulfuric acid (Type II and
    Type III).

11
  • Anodizing aluminum parts also presents an array
    of options when it comes to adding color. The
    coloration process works by injecting a pigment
    into the empty pores of the part. Once the
    colored pigment reaches the surface, its sealed
    off to preserve the selected color. This creates
    an visual effect that wont fade away and cant
    be scratched off, keeping the appearance of your
    parts in premier shape.
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