Preparation of titanium hydride dehydrogenation how the tube surface purification

 Hydrogenation dehydrogenation (HDH) titanium titanium tube preparation process used materials are not limited to titanium sponge, you can also use scrap,  Gr5 titanium forged ring  scrap and residues of titanium scrap, so it is a good way to feed the energy utilization of disability. The process of this method is relatively simple, the main process is:
    Titanium material - Surface Purification - Hydrogen Industry - smash a screening a dehydrogenation a screening a mixed batch of a group of a titanium tube vacuum packaging a commodity.
    If the raw material for titanium sponge, because the surface is clean, you do not need to go through the surface purification. Surface purification, a key step in the hydrogenation, dehydrogenation and crushing, screening for the law. Hydrogenation and dehydrogenation typically use vertical or horizontal resistance furnace. Mechanical vacuum pump or the unit must be large mechanical displacement. Titanium metal surface, particularly the presence of residual titanium surface layer of oxide film, the surface of this layer of oxide film on titanium hydrogen absorption rate is large, it is the degree of influence depends on the temperature when the oxide film. Therefore, before performing hydrogenation, the general need for surface purification.
    In order to eliminate the influence of a surface oxide film of the hydrogen absorption process, the  Grade 9 Titanium components  can be in a vacuum or hydrogen heat treatment, when heated to 700-850 ℃, titanium oxide diffused to the surface of the pipe inside the metal, titanium tube after treatment The hydrogen absorption rate greatly increased. However, this method during the heat treatment of the oxide film and the end of the elimination of the oxygen, but enters the inside of the metal, it will not only reduce the hydrogen diffusion rate of the metal interior, and oxygen will go into the final product, thereby reducing product quality; while heating process the particles of titanium tube will cause some degree of sintering, lowering its hydrogen absorption rate.
    Chin reasonable way to eliminate the surface oxide film is chemical treatment. First, put it in 2% sodium hydroxide was heated to melt NaoH 330-425 ℃, processing 15min, at this time the surface of TiO2 titanium tube is reduced to Ti0, but also with the generated Ti0 base reaction:
    Ti0 ten 2Na0H = Na2Ti03 ten H2
    After the thus-treated surface of titanium tube becomes loose porous, it is easily dissolved in a solution containing nitric acid or sulfuric acid or HF in NaF. After acid-soluble titanium tube surface oxide film will be completely eliminated. However, during the chemical treatment, should minimize the loss of Chin. If the surface contamination is not serious, there is no need for such treatment, but must be cleaned to remove oil. If the oxide film is thick, should dilute HF-HNO3 acid mixture cleared. When the acid, the reaction is severe, the need to minimize the loss of dissolved titanium tube promptly removed and washed with water.
    If the oxide film becomes very thick oxide must eradicate oxide. Available methods are sandblasting and other mechanical methods, and then remove the oxide film by pickling.