The titanium castings could be immerged into 1mol:5mol (HF:HNO 3) acid combination for 60sec after 90sec sandblasting at the pressure of 0.6 MPa in order to get rid of the whole thickness of contaminated layer of its surface.

• 经 0 .；6MPa压力喷砂 90sec的试件在 1mol:5mol(HF :HNO3)混合酸溶液中浸泡 6 0sec即可将表面污染层完全去除