How is aluminum oxide coloring?
After aluminum products soaked in dye solution, namely color oxide film absorption, aluminum display color. Finally, the dyed aluminum into blocking solution is heated to pore sealing, so that the color of the surface of the aluminum will remain long.
The production process can be seen from the above description, aluminum oxide coloring treatment has two functions, one thick oxide film and increase the wear resistance, and second, after the bright and beautiful coloring.
To make colored aluminum oxide, aluminum surface first in the thick oxide film manufacturing practice is done with sulfuric acid electrolyte 1:4, aluminum anode, a cathode electrolysis carbon rods, after about half an hour, aluminum products thick oxide film formed on the surface, up to tens of microns, there are many pores can absorb the color molecules.
Aluminum rapidly oxidized in air, a dense oxide film formed on the surface, not to continue to protect the inside of the aluminum oxide. But the natural oxide film formed generally only a few microns thick, not rubbing, it can not be used coloring
Colorful aluminum products in the shop, some gold, some green, some red ...... these colors are not the same as painting painted to go, but the use of absorption colorant adsorption of alumina.
