The complete guide to dielectric coating for EV battery assemblies: TiZr passivation

Why is metal pre-treatment the key to the dielectric coating process? 

The titanium zirconium passivation (TiZr) is a chrome-free conversion coating, is applied to aluminium components. Through this process natural oxide layer is replaced with a stable, chemically modified ‘shield’ layer. 

The process of TiZr-passivation

The pre-treatment process removes surface dirt, oils, contamination, and the natural oxide layer and replaces it with a thin (approx 20nm) stable Titanium/ Zirconium conversion layer. This results in a firm foundation for dielectric coating, providing long-term durability.

Pre-treating the aluminium results in additional protection against corrosion, a significant factor for environments where the aluminium component may be exposed to moisture, chemicals, or high temperatures. 

Check out the video on how Dr. Nick Welton, our Technical Manager is using XRF equipment, Dyne inks, and UV-Fluorescence to measure metal surface cleanliness.

 

Common defects affecting dielectric coating performance.

 

Metal pre-treatment: A key step towards achieving stated properties in technical data sheets.

To deliver the design coating properties as stated on technical data sheets, like required insulation resistance, corrosion resistance, and any mechanical properties, we need to have a high-performance pre-treatment system to minimise defects to deliver a dielectric coating system that satisfies your specification requirements as mentioned in technical data sheets.

 

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