The as cast Ti6Al4V, obtained after investment casting with yttria stabilized zirconia face-coat, was chemically milled using a mixture of hydrofluoric acid and nitric acid. This process removed completely the alpha-case layer. Lower hardness and almost no oxygen contamination are revealed after microhardness measurement, Energy dispersive X-ray and X-ray diffraction analysis. The hydrofluoric acid/nitric acid ratio, pickled Ti6Al4V surface, pickling efficiency, pickling rate, immersion time and solution temperature are discussed.
Reference:
Mutombo, K, Rossouw, P and Govender, G. 2013. Chemically milled alpha-case layer from Ti-6Al-4V alloy investment cast. In: 5th International Light Metals Technology Conference 2011 (LMT), Lüneburg, Germany, 19-22 July 2011
Mutombo, K., Rossouw, P., & Govender, G. (2011). Chemically milled alpha-case layer from Ti-6Al-4V alloy investment cast. http://hdl.handle.net/10204/7193
Mutombo, K, P Rossouw, and G Govender "Chemically milled alpha-case layer from Ti-6Al-4V alloy investment cast." (2011) http://hdl.handle.net/10204/7193
Mutombo K, Rossouw P, Govender G. Chemically milled alpha-case layer from Ti-6Al-4V alloy investment cast. 2011; http://hdl.handle.net/10204/7193.
