Aluminum Anodising Explained

Aluminum anodising is a controlled oxidation process that includes 5 distinct stages:

  • Cleaning to remove grease and other contaminants.
  • Pretreatment, which comprises etching and brightening.
  • Anodising, in which the anodic film is built and combined with the metal by passing an electrical current through an acid electrolyte bath.
  • Colouring, which can be done in a variety of ways.
  • Sealing, which closes the pores in the anodic film.

The coating thickness and surface characteristics are tightly controlled to meet end product specifications.

The Anodising Process

De-smutting

De-smutting after etching is an important part of anodising. De-smutting gently cleans the surface, removing metals and caustic etching residues. BONDERITE products do not affect the etching finish and do not etch the surface. BONDERITE offers two kinds of de-smutting agent, a liquid pack product, which can be diluted in water, and a liquid and powder product used as an additive in exhausted sulfuric acid. BONDERITE products are superior to traditional nitric acid. Non-existent or low levels of nitric compound ensure water discharge compliant with WWT legislation. The products help to reduce energy consumption and ultimately costs.

Anodising

BONDERITE anodising additive helps to make your anodising tank more efficient, enabling you to maximise your existing anodising process. By using anodising additives you can optimise your production, generate energy savings and increase coating thickness within the same treatment time.

Electro-colouring

Making a perfect and reproducible colour in one go is the first step in avoiding extra cost. Increasing treatment time, remaking a colour and creating a scrap material affect unit cost and profitability. BONDERITE electro-colouring was developed to overcome all these issues. High tin content, perfect stabilisation and high throwing power ensure perfect colour and perfect reproducibility from the very first batch. High-quality BONDERITE products allow you to set the best chemical and electrical parameters to achieve the best colour in minimum time. Chemical product performance will help you avoid extra costs or tin precipitation, generating savings and best performance.

Sealing

These products seal the pores created by anodising to ensure and increase corrosion protection in outdoor exposure. All BONDERITE sealing products for cold and hot processes fulfil the European - Qualanod and GSB specification. BONDERITE sealing products help you achieve the corrosion protection required for architectural aluminum in external use. The BONDERITE sealing process has been developed to deliver high bath stability, high performance, less consumption and energy savings. 

Benefits of BONDERITE Aluminum Anodising Process

The main benefits of the BONDERITE Anodising Process are corrosion resistance, abrasion protection, insulation and aesthetic appearance.

Henkel supplies its BONDERITE anodising products in liquid or powder form with the following properties:

  • High de-smutting
  • Reduced NOx
  • No surface etching
  • Borate-free
  • Low/no foam
  • Less viscosity at high Al concentration
  • Ready-to-use solution
  • No sludge
  • High uniformity of colouration
  • Non-existent or very low NO3 compound 
  • Room temperature
  • Automatic feeding
  • Low product consumption
  • Analytical control
  • High tank span life
  • Less renewal
  • Ni cold seal (24°C – 28°C)
  • Ni-free hot seal (> 95°C)

New products are developed in Henkel’s own R&D centres and undergo rigorous testing. Coupled with a state-of-the-art analytical department, this ensures customers always get the highest quality and outstanding service.

Aluminum Degreasing

Mild alkaline liquid and powder products for removing surface contamination.

Read more

Equipment

BONDERITE process control equipment - a full range of application equipment and digital process control systems.

Read more

Laboratory Services

Continous support from project to production, state-of-the-art surface analysis and standard control procedures.

Read more

Downloads

Superior Functional Coating Technologies

Sales Search

Interested in our products and services? Get in touch with our Experts!

Search now