What role does second stage oxidation treatment play on flashlight? Generally speaking, you may hear the sales tell you that their flashlights’ shell is treated with two-stage oxidation reaction process, but why does the shell needs that ? Here this article will share you some tips.

In the aluminum industry, “oxidation” is kind of a surface treatment process. Because aluminum and its alloys feature active metallic nature and unstable characteristics, the oxidation process treated on its surface is aimed to “Not easy to get rusty”, and gain a exquisite appearance. Strictly speaking, the “oxidation” has little to do with the solidity but can make the surface not easy to get scratched. What determines the hardness is the material itself, for example, aluminum or alloys, what kind of aluminum, etc. The pure aluminum is of very low hardness. Then heat treatment of aluminum is called ‘Aging’ inline. It heats the aluminum to 380-500 degrees Celsius, keep the stage a while and then let it cool naturally so to increase the hardness. The so-called hard oxygen oxidation process is kind of surface treatment technology, of course, it can only improve the abrasion hardness rigidity but not increase solidity.

If a piece of aluminum is not processed, its surface will generate a piece of oxide film, thin, colorless and not abrasion resistant. Common oxidation process is to electrify the electronic cell to generate an oxide layer which is under control, the thickness can be controlled by the current density and time, there are a lot of benefits than the natural oxide layer, wear-resistant, non-conductive. You can dye (generally black or any color) hard oxygen processing, technology and general principle similar oxygen, but a low temperature and low current density, long time, special electrolyte it can get denser and thicker oxide layer with higher hardness.

The problem is, there is no distinct line between Cape oxygen and hard oxygen, so the US military to develop a standard HAII which is three hard oxidation in the country, many manufacturers do not strictly in accordance with the standards of production, but also similar to hard oxygen, and call it HAIII to advertising(but in fact it is different from the secondary oxidation) . No matter what oxidation process the flashlight adopts, the goal is to protect the shell not easy to be scratched, get rusty and gain a beautiful appearance.