AlGal – Aluminum-Rich Epoxy Coating

Specially coated tubes are requested by GM for the hydraulic steel tubes carrying fluids for automotive, with a GM designation GE.

It is named Zinc-Aluminum Alloy-Extended Corrosion Protection by GM, and called ALGAL coating mostly in China.

It is defined as the following:

Zinc-aluminum alloy as described in GALFAN , with coating thickness 3 micrometer, i.e. 50 g/m2 per ASTM A875, followed by an approved pre-treatment process and an approved aluminum-rich epoxy coating.

The purpose of this process is still enhance the corrosion resistance of the tubes further to 1000 hr min.

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