Acid pickling of pure titanium castings

The dissolved quantity of HF solution at room temperature for titanium is far greater than the HCL and H2SO4 solution, and low concentration of HF can be 1.5% or 2.5% make Titanium  bulk dissolved in a very short period of time, the rapid improvement of surface roughness, surface hardness is decreased.

  For the titanium and its alloys in HF solution at room temperature can be a lot of soluble H2 (analytic 6HF+2Ti=2TiF3+3H2 arrow), and a passivation reaction in HNO3 solution,the chemical properties of the surface of the passivation layer is extremely stable.

  Visiblly, the corrosion rate of HNO3 solution is added into the HF solution can not only control of titanium, but can be significantly reduced due to Titanium casting surface hydrogen permeation and lead to the risk of hydrogen embrittlement, acid wash so experiment using mixed acid solution of HF and HNO3 of pure titanium castings.