Anodization Of Aluminum Oxidation

Aluminum is a relatively active metal, the standard potential of -1.66V, in the air can naturally form a layer of thickness of about 0.01 ~ 0.1 micron oxide film, this layer of oxide film is amorphous, thin and porous, poor corrosion resistance. However, if the aluminum and its alloy is placed in the appropriate electrolyte, with aluminum products as the anode, under the action of the applied current, so that the surface of the oxide film, this method is called anodic oxidation.

Through the selection of different types, different concentrations of electrolyte, and control of oxidation process conditions, can be obtained with different properties, thickness of about dozens to hundreds of microns, its corrosion resistance, wear resistance and decorative have been significantly improved and improved. The electrolyte used in the anodizing of Al and aluminum alloy is generally acidic solution with moderate solubility, and lead as cathode only plays the role of conducting electricity. When aluminum and its alloys are anodized, the following reactions occur at the anode:

2Al ---> 6e- + 2Al3+

The following reactions occur at the cathode:

6H2O +6e- ---> 3H2 + 6OH-

At the same time, acid chemically dissolves aluminum and the oxide film generated, and the reaction is as follows:

2Al + 6H+ ---> 2Al3+ +3H2

Al2O3 + 6H+ ---> 2Al3+ + 3H2O

The growth process of oxide film is the process of continuous formation and dissolution of oxide film.

If you have any questions, please contact us. Our company can produce various customized needles, medical needles, puncture needles, hypodermic needles, biopsy needles, vaccine needles, injection needles, syringe needles, veterinary needles, pencil point needle, ovum pick up needles, spinal needles, etc. If you need customized needle products, please contact us. We look forward to your inquiry! The quality of the products manufactured in our factory will surely satisfy you!

Please contact us if you need: zhang@sz-manners.com