Introduction

①6063 is a representative alloy for extrusion. Its strength is lower than that of 6061. It has good extrudability and can be used as a shape with complex cross-sections. It has good corrosion resistance and surface treatment.

② It is a low-alloyed Al-Mg-Si series high plastic alloy. Has many valuable features:

1. Heat treatment strengthened, high impact toughness, insensitive to defects.

2. It has excellent thermoplasticity and can be extruded at high speed into complex, thin-walled, hollow profiles or forgings with complex structures, wide quenching temperature range, low quenching sensitivity, after extrusion and forging demoulding, As long as the temperature is higher than the quenching temperature. It can be quenched with water spray or through water. Thin-walled parts (6<3mm) can also be wind quenched.

3. Excellent welding performance and corrosion resistance, no stress corrosion cracking tendency. Among the heat-treatable aluminum alloys, Al-Mg-Si series alloys are the only alloys that have not found stress corrosion cracking. 4. After processing, the surface is very smooth and easy to anodize and color. The disadvantage is that it will adversely affect the strength (parking effect) if it is parked at room temperature for a period of time after quenching.

application

     Within the composition range of 6063 aluminum alloy specified in the national standard GB/T3190, different values of the chemical composition will result in different material characteristics. When the chemical composition has a large range, the performance difference will fluctuate in a large range. , So that the comprehensive performance of the profile will be out of control. Therefore, it is preferable that the chemical composition of 6063 aluminum alloy becomes the most important part of producing high-quality aluminum alloy building profiles. The role of alloying elements and their effects on performance 6063 aluminum alloy is a medium-strength heat-treatable strengthening alloy in the AL-Mg-Si series. Mg and Si are the main alloying elements. The main task of optimizing the chemical composition is to determine the Mg and Si Percentage content

chemical composition

 Al：Allowance

 Si：0.20～0.60

 Cu：0.10

Mg:0.45～0.9

 Zn：0.10

 Mn：0.10

 Ti：0.10

 Cr：0.10

 Fe：0.35

Mechanical properties

 σb (MPa)：≥205

 σp0.2 (MPa)：≥170

 δ5 (%)：≥7

Surface corrosion

     The corrosion of 6063 aluminum alloy profiles caused by silicon can be prevented and controlled. As long as the purchase of raw materials and alloy composition are effectively controlled, the ratio of magnesium to silicon is ensured within the range of 1.3 to 1.7, and the parameters of each process are strictly controlled. , To avoid segregation and liberation of silicon, try to make silicon and magnesium form a beneficial Mg2Si strengthening phase.

     If you find this kind of silicon corrosion spots, you should pay special attention to the surface treatment. In the degreasing and degreasing process, try to use weak alkaline bath liquid. If the conditions are not allowed, you should also soak in the acid degreasing liquid for time Try to shorten it as much as possible (the qualified aluminum alloy profile can be placed in the acid degreasing solution for 20-30 minutes, and the problematic profile can only be placed for 1 to 3 minutes), and the pH value of the subsequent washing water should be higher (pH>4, control Cl- content), prolong the corrosion time as much as possible in the alkali corrosion process, and use nitric acid to emit light when neutralizing the light. When sulfuric acid anodizes, it should be energized and oxidized as soon as possible, so that the dark gray corrosion points caused by silicon are not obvious , Can meet the requirements of use.