Anodizing

Type of technology

Coating

Development phase

advanced

Level of innovation

Scale of production

batch

Technology readiness level TRL

Description of the technology

The process involves the electrolytic formation of an oxide layer on the workpiece.

The workpiece is immersed in an electrolytic bath in which it acts as an anode. In anodising, the electrolyte is usually sulphuric acid. During electrolysis, when a DC voltage of 12-20V is applied to the electrodes, oxygen is released, which reacts with the metal to form a transparent oxide film.

Purpose of use

surface treatment of metals involving the electrolytic formation of an oxide layer

Use in industry

machine, automotive, construction and aviation industries

Alternative technologies

thermochemical treatment

Visualisation of action

Advantages

increasing the metal’s resistance to external factors
helping to prevent severe damage to components operating in dynamic conditions
improving the aesthetic/visual qualities of the workpieces
high corrosion resistance

Disadvantages

the need for a dedicated anodising station
limited range of workpiece materials (mainly aluminium)

Workpiece material types

aluminium
aluminium alloys
some types of steel

Examples of products

aluminum wheels
handlebars
frames
bicycle drivetrain components
electronic equipment housings
heat sink housings
structural components
window and door frames

Implementation of the technology

Required resources

anodising station
electrolytic fluids
power source

Required competences

training in electrolytic coating methods

Environmental aspects

Water consumption

Energy consumption

Waste generated

Expert evaluation

Competitiveness

Usability

Environmental impact

Development centers

University of Silesia

Legal conditions

none