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Anodized metal surface treatment technology

2022-07-21

The process that aluminum alloy forms an oxide film on aluminum products (anodes) under the action of external current under the corresponding electrolyte and specific process conditions.

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The natural alumina on the surface of aluminum products is soft and thin, with poor corrosion resistance, so it cannot be an effective protective layer, and it is not suitable for coloring The artificial oxide film is mainly made by chemical oxidation and anodic oxidation Chemical oxidation refers to the treatment process of aluminum products in weak alkaline or weak acid solution, in which some base metals react to thicken the natural oxide film on its surface or produce other passive films. The commonly used chemical oxide films include chromic acid film and phosphoric acid film, which are thin and have good adsorption, and can be colored and sealed.
1. Anodic oxidation can be divided into:
Direct current anodizing, alternating current anodizing, pulse current anodizing
2. According to electrolyte:
Sulfuric acid, oxalic acid, chromic acid, mixed acid and natural coloring anodic oxidation with sulfonic organic acid as the main solution
3. According to the nature of the film:
Common film, hard film (thick film), porcelain film, bright modification layer, barrier layer of semiconductor effect, etc
Among them, direct current sulfuric acid anodizing is the most common method。

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7-swors is a precision engineering manufacturer, specializing in providing high-quality processing parts of various materials, using the latest CNC milling, multi axis, processing, injection molding, laser cutting and bending technologies.

Shenzhen Perfect Precision Product Co., Ltd.

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