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From Which Guarantee Perfect Oxidation Of Casting To The Mirror Effect
- Jan 16, 2017 -

In order to obtain highly pure and transparent surfaces, operations staff to mirror the casting process, but only to find that the mirror effect is not so ideal. Among these, the oxide film formation by sulfate was the culprit, including its oxide film of oxide film thickness, porosity, oxide film purity, quality, and so on.

You know, these parameters mentioned above will have an impact on the mirror effect of the casting, particularly when the oxide films containing too much silicon, manganese, iron, copper, chromium, and other impurities, resulting in lower purity of the oxide film, so that the transparent end of casting surface will naturally be reduced.

You know casting oxide film is transparent, but there will be some loss of light scattering, and oxide film thickness increased transparency will decline. And in the final analysis of oxide film pin hole is the main source of light scattering, which means higher the porosity of the surface oxide film, the more scattering of light, its transparency will decline rapidly.

So choosing the right sealing material for casting is also key, if this is the case at room temperature recommended nickel hydroxide and aluminum fluoride salts because they are transparent, normal sealing almost never reduce the transparency of the oxide film. But be sure to control the sealing temperature and time, avoid sealing and reduced the transparency of the surface oxide film.

There is also to be improved from its source, which reduce the oxide film containing impurities that have oxidation bath, and appropriate to reduce the content of alloying elements in casting and impurity content, high purity materials for processing.

Therefore, to get the mirror effect perfect casting oxide must improve the transparency of the oxide film, and control of oxide film thickness, reduced oxidation film porosity, improve the purity of the oxide film, ensure the sealed moderate aspects, reduce negative impacts.