Aerospace anodising is a precision surface treatment which strengthens the durability, adhesiveness and resistance to corrosion of aluminium components. In the aerospace industry, where end products operate in extreme conditions, the controlled oxide later produced by anodising significantly improves both structural integrity and appearance.
The annual turnover of the UK aerospace industry is £34 billion, yet only a very small number of companies, like www.poeton.co.uk/about/industries/aerospace-defence, can offer these highly specialised aerospace surface treatments.
The Process
First, the surface to be treated is thoroughly prepared through cleaning and degreasing. The material is then immersed in a multi-tank system filled with deionised water rinses. Treatment can be performed on parts of up to 120 inches long and strict controls guarantee the adhesiveness, quality and thickness of the coating.
Types of Treatment
Sulfuric Acid Type II anodising, often using sodium dichromate or nickel acetate seals, forms a strong oxide layer to protect the most crucial components. It results in exceptional corrosion resistance and structural integrity, as well as providing a smooth finish ideal for painting.
The thinner coating produced by Type IIB anodising is a common alternative, while Class 2 provides dyed options, like red or black, to meet specific aesthetic demands. Processing is carried out in strict adherence to standards such as AMS2471 and MIL-PRF-8625 to ensure compliance with military requirements, including thicker coatings for extreme environments.
Anodising finishes are constantly evolving with the introduction of new alloys and the tightening of sustainability goals, but service providers continue to meet the stringent specifications of the aerospace industry, boosting reliability in high-stress applications.
