Precautions for pretreatment process of aluminum plate and aluminum alloy
- Jan 18, 2019 -

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Aluminium materials are extremely unstable in the air and are easy to produce oxide membranes that are difficult to identify with the naked eye.

Care needs to be noted in the pretreatment process: Although the natural oxidation film on the surface is only initially generated, the unprocessed surface is left with the over-thick oxidation layer formed during the casting process, the workpiece into the heat treatment or welding process before the formation of a layer of oil sintering coking These cases are noted as follows:

(1) fine machining parts in the pre-treatment process needs to pay attention to the problem: fine machining Parts Although the surface of the natural oxidation film is only newborn, easier to remove, but greasy weight, especially in and around the hole (due to lubrication needs in the machining process and added), such workpieces must first be cleaned by organic solvents.

(2) Casting molded parts in the pre-treatment process need to pay attention to the problem.

The original oxidation film of this part should be removed first by machining or Sandblasting method, or after alkali washing, only in order to remove the original oxidation layer of the net unprocessed part, but also to avoid the change of the tolerance size of the machining part.

(3) After heat treatment or welding process of the workpiece in the pre-treatment process needs to pay attention to the problem: according to the process requirements, the workpiece into the heat treatment or welding process before the need to be cleaned by organic solvents, in addition to the net surface oil, with concentrated nitric acid soaking method to soak soft this layer of coking, until the coking is soft and then


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