Why Aluminum Products are Difficult to Plating ?

Aluminum product plating refers to the process of using the principle of electrolysis to coat a thin layer of other metals or alloys on the surface of Aluminum Casting Parts,Aluminum Die Casting Parts,Forged Aluminum Parts and Aluminum Precision Machining products, so that aluminum products can achieve rust prevention, improve wear resistance, electrical conductivity, reflectivity, and corrosion resistance. and enhance aesthetics.

1. Aluminum products have a high affinity for oxygen, and it is easy to form an oxide film, and once this oxide film is removed, a new oxide film will be formed in a very short period of time, which seriously affects the bonding force of aluminum products and coatings;

2. The electrode potential of aluminum products is very negative, and it is easy to replace with metal ions with positive potential when immersed in the electroplating solution, which affects the bonding force between aluminum products and the coating;

3. The expansion coefficient of aluminum products is larger than that of other metals, so it is not suitable for electroplating in the range of large temperature changes. Different expansion coefficients of Cnc Aluminum Parts and other metal coatings will cause greater stress, so that the bonding force between the coating and aluminum products is not strong;

4. Aluminum parts are amphoteric metals, which are soluble in acid and alkali, and are unstable in acid and alkali electroplating solutions.

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