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The reasons for uneven oxide film of aluminium surface treatment

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We may know that there is an oxide film on the surface of the aluminum alloy, which can protect the aluminum alloy coil, but sometimes we will find that the oxide film will have uneven color.So what’s going on here?The following alloy aluminum manufacturer will  introduce the problem of uneven oxide film alloy aluminum coil and prevention..

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1, the problem: the swing in the slot working area is too large, and then the color generated in the oxide film is inconsistent.

Prevention method: oxidation workpiece rotation fluctuation is small, can be quietly disposed of, but when the solution temperature is too low, prone to map-like speckles, appears unnatural.

2. Problems: When the damaged part of the alloy aluminum coil processing cladding is cut off, the outer layer is dressed with high-quality aluminum alloy and the inner layer is miscellaneous aluminum. Due to the great difference, “vitiligo” -like spots will occur after oxidation.

Prevention method: material strict control, reduce or remove miscellaneous aluminum.

3, the problem: the process operation in the workpiece alkaline etching disposal is not complete, the original part of the oxide film, dirt can not be removed;The surface is still alkaline after being treated immediately after the alkaline etching.The workpiece touches a foreign body during the transfer process.

Prevention method: in the production process to strictly ensure the integrity of the alloy aluminum coil process, in order to produce better products.


Post time: Jun-08-2021