The various processes that are collectively referred to as Anodising can be a costly waste of time and money if not chosen correctly. Below outlines the key reasons for choosing Sulphuric Acid Anodising for your parts.
Your Alloy Is a Standard Wrought Grade
These standard wrought aluminium grades (e.g. 6082, 5083, 2024) have a chemistry that lends itself well to Sulphuric Acid Anodising. High-silicon casting alloys however, can produce an uneven, dark Anodised finish. These alloys are not suitable for Sulphuric Acid Anodising.
Your Tolerances Allow a Thin Build-Up
Sulphuric acid anodising produces a relatively thin layer. A build-up of 10 to 25 microns is typical for this form of anodising. This compares with the hard anodising process, for example, which can add a layer up to 75 microns thick. This factor needs to be taken into consideration when parts are produced to tight dimensional limits and cannot afford to have a large layer added to the surface.
You Need a Dyed or Clear Cosmetic Finish
This is because the open-pore oxide layer that forms during anodising prior to sealing can be easily dyed to produce a wide range of colours and a clean, consistent appearance. This makes anodising ideal for cosmetic purposes where the colour of the anodizing, or a natural bright appearance, is more important than hardness. Understanding the process of anodising and how the oxide layer is built, is crucial to appreciate the advantages of the sulphuric acid process for cosmetic purposes.
Moderate Corrosion Resistance Is Enough
Sulphuric acid anodising will provide a good salt spray and weathering test for most general engineering/Consumer articles. However for heavy sliding wear or aggressive chemical use, hard anodising would be the better option.
Cost and Throughput Matter
As a cost effective solution for volume production where hard anodising is over specified, Sulphuric Acid Anodising offers a cost effective solution for production aluminium parts.
For Sulphuric acid anodising, visit https://www.poeton.co.uk/surface-treatments/anodising/sulphuric-acid-anodising/.
Matching the anodising process to the work to be carried out will avoid specifying an excessive amount of performance for the part in question.
