What do you mean by surface treatment and anodizing?

The process of forming an oxide film on an aluminum product (anode).

Anodic oxidation and electrochemical oxidation of metals or alloys. The process that aluminum and its alloys form oxide films on aluminum products (anodes) under the corresponding electrolyte and specific technological conditions due to the action of external current. Unless otherwise specified, anodizing usually refers to sulfuric acid anodizing.

In order to overcome the defects of surface hardness and wear resistance of aluminum alloy, expand the application scope and prolong the service life, surface treatment technology has become an indispensable part of aluminum alloy, and anodic oxidation technology is the most widely used and successful at present.

Extended data:

Surface treatment method

1, surface treatment before painting

In order to remove all kinds of foreign objects (such as oil stains, rust, dust, old paint film, etc.). ) attached to the surface of the object, provide a good substrate suitable for painting requirements, and ensure that the coating film has good corrosion resistance, decoration and some special functions. The surface of the object must be pretreated before painting. The work done by this treatment is called (surface) treatment or (surface) pretreatment before painting.

2, manual processing

Such as a scraper, a wire brush or a grinding wheel. Rust and scale on the surface of workpiece can be removed by hand, but manual treatment is labor intensive, inefficient, poor in quality and incomplete in cleaning.

3. Chemical treatment

Mainly uses the acidic or alkaline solution to chemically react with the oxide and oil stain on the surface of the workpiece, so as to dissolve it in the acidic or alkaline solution to remove the rust scale and oil stain on the surface of the workpiece, and then uses a brush roller made of nylon or a wire brush roller made of 304# stainless steel wire (acid-and-alkali-resistant solution) for cleaning.

Chemical treatment is suitable for cleaning thin plate parts, but the disadvantage is that if the time is not properly controlled, even if corrosion inhibitor is added, it will corrode steel. For parts with complex structure and holes, it is difficult to completely remove the residual acid immersed in cracks or holes after pickling with acidic solution.

If it is not handled properly, it will become a hidden danger of future corrosion of the workpiece, and the chemicals are volatile and costly, so it is difficult to discharge the treated chemicals. If it is not handled properly, it will cause serious pollution to the environment. With the improvement of people's environmental awareness, this treatment method is being replaced by mechanical treatment.

Reference source:

Baidu encyclopedia-anodic oxidation

Baidu encyclopedia-surface treatment