Anodisointiin

Anodisointiin, commonly known as anodizing, is an electrochemical process used to increase the thickness of the natural oxide layer on the surface of metal parts. This process is most commonly applied to aluminum alloys, but can also be used on titanium, magnesium, zinc, and other metals. The primary purpose of anodizing is to enhance the corrosion resistance, wear resistance, and aesthetic appeal of the substrate material.

During anodizing, the metal part is immersed in an electrolytic solution, typically sulfuric acid for aluminum, and acts as the anode in an electrical circuit. The cathode is usually made of a conductive material like lead or stainless steel. When a direct electric current is passed through the solution, it causes a controlled oxidation of the metal surface. The oxide layer that forms is porous, allowing for subsequent dyeing or sealing.

The properties of the anodized layer can be controlled by varying parameters such as the electrolyte composition, temperature, current density, and time. Different anodizing processes produce layers with varying thicknesses, hardness, and porosity. For aluminum, common anodizing types include Type II (sulfuric acid anodizing) and Type III (hard anodizing), which produces a thicker and harder oxide layer.

Anodizing is a widely used surface treatment in various industries, including aerospace, automotive, architectural, and consumer electronics. It provides a durable and attractive finish that is resistant to scratching, fading, and corrosion. The porous nature of the anodized layer also allows for effective coloring through dyeing, creating a wide range of aesthetic options.