Preparing Material for Anodizing
It is always best if we understand the final application of the item before we anodize in order to advise you of your best options.
To ensure that the quality of your anodizing is the best it can be, here are some important tips to follow before you send your order in to Altech.
The final finish of the anodized surface depends on the condition of the base metal before the process.
All imperfections need to be removed before anodizing by procedures such as polishing, abrasive blasting, finishing etc. depending on the desired appearance.
The rougher the surface, the more matte the finish will be.
For a shiny finish, it is essential that the base material is highly polished before being anodized.
A high degree of reflectivity can be achieved if requested, but certain alloys will always develop a matt surface regardless.
No, anodizing typically highlights scratches and other surface and material imperfections. Surface preparation is fundamental to achieving an excellent finished product.
- Do not apply sticky tape directly to surfaces that are going to be anodized. The residue that it leaves behind will not be removed by our standard pre-treatment processes.
- Do not handle untreated items with your bare hands as it will cause fingerprint corrosion.
- If you are going to use abrasive blasting to prepare your base material, ensure that it is done evenly. Inconsistencies that are created by this process will be accentuated by anodizing.
- If you are linishing your item, it is important to use separate finishing belts for aluminum and not aluminum materials. This will avoid the introduction of foreign particles being embedded into the surface.
- Not visible before anodizing, it will show up as ugly gray marks or pitting once the process is completed.
- Do not use paints or varnishes on the surfaces that are going to be anodized.
- Make sure that you use the proper alloy welding wire to prevent your weld from turning black or gray after anodizing.
- Do not use excessive heat when welding as it can affect the properties of the metal which causes irregular discolouration once anodized.