Metal surface treatment technology is a silane coating before the new energy-saving environmental protection technology, it has at room temperature, residue-free non-toxic phosphate-free, simple process, the process is short, and low cost advantages of irreplaceable phosphate technology. ECO-003 silane metal surface treatment agent is a silane as the main polymer additives such as rust-proof composite material made of. Workpiece after treatment, the adsorption of a layer of thin metal surface (50 ~ 500nm) phosphate crystal-like three-dimensional network structure of the organic layer, while a strong binding force formed at the interface Si-O-Me were Bond, can be coupled metal surface and organic coating has good adhesion, can be applied to aluminum, aluminum alloy, galvanized or zinc-based pre-treatment parts to replace hexavalent chromium passivation.