The oxidation treatment of high frequency heater is the principle of the formation of oxide film
High frequency heating machine oxidation treatment solution is mainly composed of very strong alkali and oxidant. As soon as it is heated in the solution, the surface begins to be slightly corroded. The iron ions precipitated interact with the base and oxidant to form sodium ferrous Naz Fe2 02 and sodium ferrite Na2 Fez 04. Then the sodium ferrite and sodium ferrite further act to form ferric oxide Fe3 04, that is, Fe-Na2 Fe2 -, Naz Fez 04 - Fe3 04.
The color of the oxide film changes gradually with the increase of film thickness, and the changes during bluing are as follows:
The initial color is yellow, orange, red, purplish, purple, blue, and black
Effect of NaOH on high frequency heater
NaOH can make the surface of the workpiece slightly corroded, precipitate iron ions, in the bluing process plays a promoting role.
Energy * high frequency heating machine solution has sufficient oxidation temperature, because the melting point of NaOH sodium bialitrite (NaN02) is higher, the melting point of NaOH is 322℃, the melting point of NaN02 is 281℃. In the process of oxidation, if it is found that the temperature does not rise high, then add a small amount of NaOH to make it conducive to the temperature rise. Therefore, NaOH can be used as one of the measures to adjust the boiling point of solution.
In addition, NaOH can also play a role in removing oil stains, also conducive to the formation of oxide film.
On 2018-08-08 11:45:46
