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2021 Hard oxide 6061 summary

6000 series aluminum alloy represents 6061 mainly containing magnesium and silicon, so the advantages of 4000 series and 5000 series are concentrated

Our company making blank firing adapter, charging handle, AR15 handguard 15inch, 17 inch,etc. which will be hard anodised, material: 6061,7075.

6061: 6061 belongs to the Al-Mg-Si series alloy. It is a cold-treated aluminum forging product, suitable for applications with high requirements for corrosion resistance and oxidation. Good workability, easy coating and good processability. Features: medium strength, good corrosion resistance, good welding performance, good process performance (easy to be extruded), good oxidation and coloring performance. Application range: energy transfer tools (such as: car luggage rack, door, window, body, heat sink, box shell)

It can be Cu, so the strength is higher than 6063, but the quenching sensitivity is also higher than 6063. It cannot be air quenched. It needs re-solution treatment and quenching aging to obtain higher strength.

Alcoa 6061-T651 is the main alloy of the 6-series alloy. It is a high-quality aluminum alloy product after heat treatment and pre-stretching process; Alcoa 6061 has excellent processing performance, good corrosion resistance, high toughness, and no deformation after processing. It has excellent characteristics such as easy coloring and excellent oxidation effect. Anodizing characteristics:

Anodizing feasibility: 6-series aluminum alloy is also called "aluminum-magnesium-silicon alloy", which is particularly important in engineering applications. It is mainly used for extruded profiles. This series of alloys can be anodized. Typical grades: 6063, 6463 (mainly suitable for Bright anodized).

The high-strength 6061 and 6082 alloy anodic oxide film can not exceed 10μm, otherwise the anodic oxide film will appear light gray or yellowish gray, and its corrosion resistance is also significantly lower than 6063 and 6463.

6061 hard anodized color

Aluminum hard film 40 microns 6061 light green anode can be white, white yellow with yellowness;

5052 dark green

7075 gray

The content of aluminum and silicon most easily affects the chromaticity. Hard anodizing is generally black, gray, dark gray, or yellowish brown. The hard oxide is changed to black and natural color. The natural color is determined by the content of the material composition and the processing technology. They are different. Most of them are military green, gray, and some are yellowish.

What's the matter with mottling and uneven color?

Sometimes anodizing will also make aluminum parts scrapped. This is worthy of our attention. The first one, do not do anodizing if the aluminum parts are impure, and the second one, after doing it, you will find that the surface of the aluminum The spot is largely caused by the impure material of the aluminum part. To avoid uneven color, you must first ensure the purity of the material of the aluminum part. How to solve this? 1) When the aluminum density is not good enough, the surface of the aluminum is exposed and the color is uneven:

Solution: First take an aluminum piece to test, and if possible, perform all anodization. 2) Pre-oxidation treatment water washing process: Water after degreasing (degreasing): There should be two water washings, and the goal is to clean the residual liquid (or acid or alkali) of the product. If a solvent-based emulsifier is added to the degreasing agent , Cleaning is more important.) Or oily. Avoid bringing it into the subsequent bath to affect the invariance of the bath and prevent the product from being oily and defective.

3) Cleaning after blocking: It should be soaked in hot pure water after two washings. After the blockade, the first step is to wash the blockade liquid of the product and the impurities adsorbed on the surface. Soak hot pure water first to achieve quick-drying effect

How to judge

The surface of aluminum parts is generally electroplated on the surface, and has a relatively good and dense formed oxide film. The real raw material metal is inside the film.

The metal electroplated on the surface can be judged from the appearance. It is generally not dense and bright before electroplating, and generally brighter and has a certain luster after electroplating.