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 calledALGALcoating mostly in China.
It is defined as the following: Zinc-aluminum alloy named 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.
![AlGal Coated Bundy Pipe - Alum-rich Epoxy and Galfan](/wp-content/uploads/Galfan-Coating-01-1-300x293.jpg)
![AlGal Coated Bundy Pipe - Alum-rich Epoxy and Galfan](/wp-content/uploads/Galfan-Coating-04-1-298x300.jpg)