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Have you ever wondered why the landing gear of an airplane can withstand countless violent impacts yet remain intact? And why some military equipment can still operate flexibly even in sandstorms? The secret lies in a mysterious process called "Type 3 Anodizing".

In simple terms, Type 3 Anodizing is like putting a "Iron Man suit" on the aluminum alloy. Its technical name is "Hard Anodizing". 

Imagine ordinary anodizing as applying a layer of sunscreen to aluminum, mainly to prevent it from rusting and changing color, and to give it a nice color as well. But what about Type 3 anodizing? It's not just about sun protection; it actually gives the aluminum a layer of almost indestructible armor.

reference from：https://zjaluminum-cnc.com/blog/type-i-vs-type-ii-vs-type-iii-anodizing/

How is this "armor" made?

The process sounds even a bit "extreme": engineers put the aluminum parts into an electrolyte solution close to the freezing point (yes, close to zero degrees), and then apply a very high current. Low temperature combined with high current is like making the aluminum undergo a high-intensity "muscle training" in an extremely cold environment, eventually growing a layer of extremely dense and extremely hard oxide film on the surface. 

How powerful is this layer of film?

Its hardness is second only to that of diamond and corundum, and it is even harder than ordinary steel. Because of this, it has become an indispensable material in the aerospace and military industries.

◆ Hydraulic parts on airplanes

◆ Internal components of firearms

◆ Shock absorber piston rods of off-road vehicles

Its presence can be seen in all places that need to withstand intense wear and harsh environments. 

However, this layer of "battle suit" does come at a cost. Firstly, it is naturally dark grey or bronze in color and is difficult to be dyed into bright colors. Secondly, after wearing this "suit", the dimensions of the components will slightly increase - for precision-matched components, design should leave some margin in advance. Finally, it may make the aluminum material a little more "brittle", that is, the fatigue strength will decrease a little. 

But the flaws do not outweigh the virtues. When you need a piece of aluminum to be as wear-resistant as steel and as tough as armor, Type 3 anodizing remains the most reliable choice. It gives lightweight aluminum the strength of heavy industry-grade materials, which perhaps is the charm of materials