Economic Corrosion Protection Solution for Bundy Tubes

Zinc Plating

Galvanized (Zinc plated) Bundy tubes are used a lot in automotive and ACR industry, with advantages such as better duration before rust, being economic to replace copper tubes in some sections of the systems, and higher allowable working pressure and burst pressure.

The zinc plating for Bundy tubes can be finished with different corrosion protection performances, followed by chromium passivation (chromate treatment), with no hexavalent chromium used.

The following table shows the data of the performance.

Typical Test Results of Zinc Plated Bundy Tubes
Zinc Thickness, μm min Passivation NSS* Test, hr min
White Rust Red Rust
8 White/Light Blue NA 96
8 Yellow/Aurora 72 168
8 Dark/Olive Green
13 White/Light Blue NA 144
13 Yellow/Aurora 72 216
13 Dark/Olive Green
25 White/Light Blue NA 240
25 Yellow/Aurora 72 312
25 Dark/Olive Green

* Neutral Salt Spray

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