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- Order number: SW10025
Product information "Blue Chromating - Blue Passivation" from Betzmann Galvanik
Fields of application
Blue chromating is used to protect existing zinc coatings or galvanically applied zinc coatings from oxidation and "tarnishing".
It thus provides protection against zinc oxidation, but can hardly or not remove already existing oxidation. Furthermore, the slight yellowing caused by the brighteners of the Betzmann Galvanik zinc electrolyte after galvanizing can be removed by blue chromating. In this way, the galvanized objects are given a noble and visually appealing finish. In addition, chromating is often applied to aluminum workpieces.
Blue chromating data
pH value: 2 - 3
Working temperature: room temperature (20 30°C) Immersion time: 15 s to 2 min
Effect of immersion time in blue chromate coating
5 - 15
the yellowing caused by brighteners disappears
15 - 45
bluish shimmering, glossy surface
45 - 120
Becomes increasingly matt
Corrosion protection increases
Use of the blue chromate
Place the blue chromate in a suitable container and immerse the galvanized object in the chromate for a time between 15 and 120 seconds. Chromating must be done as soon as possible after galvanizing, otherwise a passivation layer will form on the zinc, making chromating impossible. With an immersion time of only 15 s, the yellow coloration disappears (see above). As the immersion time increases (approx. 30 s), a slightly bluish shimmering surface develops. If the immersion time is even longer, a more matte effect can be achieved. This layer then also has the highest corrosion resistance, although it is not as shiny. The times mentioned are not binding, it also depends on the condition of the zinc coating, temperature, etc. Therefore, check regularly whether the result corresponds to your wishes. Important to know: the zinc layer is removed by chromating! However, a maximum of 2 µm after a dipping time of 4 min.
Causes skin irritation. Causes severe eye irritation.
Wash hands thoroughly after use. Wear protective gloves / protective clothing / eye protection / face protection.
Wear face protection. IF ON SKIN: Wash with plenty of water.
If skin irritation occurs: Seek medical advice / medical attention.
Remove contaminated clothing. IF IN EYES: Rinse cautiously with water for several minutes. Remove existing contact lenses if possible. Continue rinsing.
Please contact your local waste disposal company or your pollutant collection point for information.