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Analysis on Production Process of Aluminium Alloy 6063 Extruded Profiles (Part 1)

Hoonly Aluminium

The 6××× series aluminium alloy extruded profile is widely used in construction, transportation, electronics and other industries due to its good corrosion resistance and comprehensive strength. Among them, alloy 6063 belongs to Al - Mg - Si system is not sensitive to stress corrosion of aluminium alloy, with moderate strength, excellent compression performance, good corrosion resistance, weldability and good processability, become the most widely used building material materials.

Chemical Composition Analysis of Alloy 6063

For the chemical composition of alloy 6063, I have had two previous articles devoted to this discussion: 
In fact, the core points have the following three aspects:
1. Selection of Mg2Si quantity.
6063 aluminium alloy heat treatment strengthening effect is increased with the increase of Mg2Si quantity increases, when the amount of Mg2Si within the scope of 0.71% to 1.03%, the tensile strength with the increase of the amount of Mg2Si approximate linear increase, the deformation resistance but also follow, processing difficult.When the Mg2Si quantity is less than 0.72%, the tensile strength value of products with small compression coefficient is not up to the standard.When the Mg2Si volume was 0.9%, the plasticity of the alloy decreased.Thus, according to Al - Mg - Si alloy mechanical performance curve, on the premise of meet the mechanical properties of the alloy, but also to smoothly of the extrusion and oxidation coloring, T5 state the amount of 6063 alloy Mg2Si control at about 0.80%, and the amount of T6 state alloy Mg2Si control at around 0.95%.
2. Selecting of Mg, Si Contents
In alloy 6063, All Mg element almost form Mg2Si, So once the amount of Mg2Si is determined, the Mg content can be calculated according to the following formula: Mg%=(1.73×Mg2Si)/2.73.
Therefore, combined with previous Mg2Si content analysis,  according to many years practice, alloy 6063, the state of the T5, Mg content about 0.5%, and the Mg content of T6 state at about 0.6%, the state of 6063 alloy T5 Mg content range of 0.46% - 0.46%, T6 state of Mg content range of 0.57% to 0.57%.
3. Control of Impurity Content
In alloy 6063, the compounds formed by Fe have a strong thermal shrinkage, which makes the ingots crack. In particular, when Fe < Si, it is easy to form a low melting point in the grain boundary of the ternary eutectic, the thermal brittleness is large; When Fe > Si, it produces a high melting peritectic reaction, which improves the temperature limit in the brittle region, and can significantly reduce the thermal cracking tendency.
Therefore, when the amount of excess Si is 0.09% to 0.13%, the content of Fe should be above 0.15%, and too low will be large. Impurities of Fe content also must carry on the control, because of Fe and Al strip or rod grain formation, from several microns to several microns, the electrode current is different from aluminium, affect the oxidation film gloss and transparency; Fe also reduces the plasticity and corrosion resistance of the alloy. If the Fe content is too high, the extrusion pressure rises and the surface quality deteriorates.Therefore, for the silver-white profile, the Fe content can be relaxed, controlled by 0.35%, and the colour profile must be controlled below 0.25%.Taken together, the Fe content is suitable for 0.15%-0.20.
6063 aluminium alloy casting bar, if the Zn and Ga contents are higher, such as zinc more than 0.02% and Ga is more than 0.03%, when extrusion profiles are neutralized before oxidation pretreatment, the snowflake spots will appear under the effect of Cl- and SO42. Therefore, the contents of Zn and Ga should also be strictly controlled.
( to be continued ...... )
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