The European Alodine passivation process for aluminum components is equivalent to which surface treatment process in China?

Alodine passivation is a chromate conversion coating process commonly used in Europe for the surface treatment of aluminum and aluminum alloys to enhance corrosion resistance and paint adhesion.

In China, Alodine passivation generally corresponds to either chromate passivation or chromium-free passivation, depending on the specific passivation solution formulation used. 

1. Traditional Alodine process (e.g., Alodine 1200S):
This type of process contains hexavalent chromium, offering excellent corrosion resistance but high toxicity. In China, this process is typically referred to as chromate passivation, which falls under the category of chemical conversion coating treatment.

2. Modern Alodine process (e.g., Alodine 5200):
This type of process utilizes trivalent chromium or chromium-free formulations, resulting in lower toxicity and compliance with ROHS environmental standards. In China, this process is often called chromium-free passivation or environmentally friendly passivation.

The Alodine passivation process commonly referred to abroad generally corresponds to the following in China:

• Chromate passivation (containing hexavalent chromium)

• Chromium-free passivation (containing trivalent chromium or chromium-free formulations)

The specific choice of process depends on functional requirements, environmental regulations, corrosion resistance needs, and subsequent coating processes.

The European Alodine passivation process for aluminum and aluminum alloys corresponds in China to either chromate passivation or chromium-free passivation. The choice depends on toxicity, environmental compliance, and corrosion resistance requirements. Traditional Alodine uses hexavalent chromium, offering strong corrosion protection but higher toxicity. Modern formulations use trivalent chromium or are chromium-free, meeting ROHS standards. RDEKONO applies these methods to deliver aluminum surface treatments that ensure performance, safety, and environmental friendliness.