The second reason for the surface corrosion of aluminum extrusion profiles

Based on our many years of production experience and the inspection of various process parameters in the production of aluminum alloy profiles, as well as the follow-up investigation of the operator's execution of the process, the following is the second cause of corrosion spots:

During the smelting process, although the addition ratio of magnesium and silicon is within the range specified by the standard, sometimes due to uneven and insufficient stirring, the distribution of silicon in the melt is uneven, and there are locally enriched areas and poor areas. Because the solubility of silicon in aluminum is very small, the eutectic temperature is 1.65% at 577°C, but only 0.05% at room temperature, and the phenomenon of uneven composition occurs after casting rods, which is directly reflected in industrial aluminum profiles. , when there is a small amount of free silicon in the aluminum matrix, it not only reduces the corrosion resistance of the alloy, but also coarsens the grains of the alloy.

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