The difference between aluminum oxide oxidation and electroplating


We say here that the oxidation of aluminum alloy is anodizing, although anodizing and electroplating are both energized, but there is an essential difference between the two.

Let’s first look at anodizing. Not all metals are suitable for anodizing. The general metal alloy comparison is anodized, and aluminum is the most widely used. Anodizing is carried out by electrolytic oxidation of a oxidized metal (aluminum) as an anode through a low-voltage direct current to form a dense oxide film on the surface of the material. This oxide film is an oxide of its own metal.


                                                  electroplating                                                                                oxidation
aluminum alloy casting with electroplating  aluminum alloy anodizing


electroplating is not the same, electroplating is suitable for a variety of metal and non-metal surface treatments. Various metals and some non-metals can be electroplated as long as they are properly surface treated. Even if it is a thin leaf, it can be electroplated as long as it is handled properly. Unlike anodizing, the material to be plated is used as a cathode, and the plated metal is energized as an anode, and the plated metal is present in the electrolyte in the state of metal ions. By the charge effect, the metal ions of the anode move toward the cathode and deposit on the material to be plated of the cathode. The more common coating metals are gold, silver, copper, nickel, zinc, and the like.


It can be seen that both anodizing and electroplating are surface treatments, which can achieve beautiful and corrosion-resistant effects. The difference between the two is that electroplating adds another metal protective layer to the surface of the original material by physical effects, and anodizing is to electrochemically oxidize one surface of the metal.


The most common surface treatment method for aluminum alloy materials is anodizing, because the anodized surface is more beautiful, corrosion-resistant and easier to handle. And the aluminum alloy material can be oxidized and colored to obtain various desired colors.