What is the white substance on the surface of aluminum products?
Release time:
2024-04-09
The white material on the surface of the aluminum product is a mixture of aluminum chloride and aluminum oxide.
The white material on the surface of the aluminum product is a mixture of aluminum chloride and aluminum oxide.
Long-term exposure of aluminum products in the humid, high salt content of the air, aluminum alloy internal metal composition of the more complex galvanic reaction, accelerate the corrosion of aluminum alloy. The chemical properties of aluminum itself is relatively lively, easy to be oxidized, why there is aluminum chloride, mainly because the penetration of chloride ions is particularly strong, aluminum alloy has a special salt spray test, similar to the sea environment, but this corrosion generally does not affect the use of metal ingots, the layer of white material automatically forms a protective layer, isolated from the outside air.
Cut three samples with a length of 250 mm from one PJ V-ribbed belt, and mark a marking line with a spacing of 100mm at the middle position of the PJ V-ribbed belt. When more than three samples cannot be taken from one PJ V-ribbed belt, samples can be cut from the same batch of PJ V-ribbed belt, but must be indicated in the report. 7.4.2 High temperature resistance test method
Place the sample at 100 ℃ ± 2 ℃ for 96 h ± 1 h and then take it out. After standing at laboratory temperature for more than 2h, bend it along a cylinder with a diameter of 20 mm at a contact angle of at least 90 °.
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