Anodizing

Anodizing is a controlled oxidation of aluminum. It is used as an anti-corrosive surface protection on parts made of aluminum and aluminum alloys.
Anodizing is used as an anti-corrosive surface protection on parts made from aluminium and aluminium alloys. After treatment, the surface is hard, abrasion resistant, non-corrosive and non-conductive.

How thick is the layer?
Provexa offers anodizing in sulfuric acid. They layer thickness is according to customers demand, we offer up to 25µm of layer thickness. Somewhat simplified, the anodizing process builds the layer as much inwards as outwards. This means that due to the pretreatment the dimensions are relatively unchanged. Please observe that it can be different between different aluminum alloys. If you send parts with high tolerances, please consult with us first.

Which aluminum alloys are possible to anodize?
Almost all aluminum alloys are possible to anodize. Which alloy that is most suitable depends on the purpose for the surface treatment. The most important factor for Provexa is that we get the information about which alloy the parts consist of. Different aluminum alloys require different pretreatments. Cast- and  7000 alloys are examples of alloys that require a special pretreatment.

Which colors are possible to get?
When anodizing aluminum, the oxidation layer that is formed, contains a lot of pores. These pores can, before the layer is sealed, be filles with colors. This process gives anodized aluminum its colors and in theory you can give it almost any color. Since each color would take up a station in our lines, we only offer three colors.

• Uncolored, (no color needed).
• Black
• Red

To get a good coloring of the details you need a lot of pores, which means thicker layers so that the color sticks. Therefore, we recommend at least 15µm anodizing when coloring.
Are there different types of anodizing?
There are multiple methods used to anodize aluminum. The difference between the methods are the voltage and which acid that are used. Provexa uses sulfuric acid in our anodizing process.

Anodizing according to ISO 7599 and MIL-A-9625F
Provexa have the possibility to meet the demands of ISO 7599:2018 and MIL-A-8625 F. Please refer to the standard in your order and we will meet these demands on your product.

Does anodizing meet the demand of RoHS and REACH?
Yes, no other metals are used or added in the anodizing process. Anodizing is also approved for contact with foodstuff. Anodizing is a environmental friendly process since the metals own oxidation process is used to reach the desired function.