Effects of gas flow

rotor speed

refining time and holding time in rotary impeller refinement method on purification of 7075 aluminum alloy were examined by orthogonal design.Meanwhile

effects of C2Cl6 refinement

rotary impeller degassing refinement and combined method of the two technologies on degassing in aluminum alloy were comparatively approached.The results show that rotor speed is the most dominant factor affecting on degassing

and then gas flow

refinement time

then holding time.The desirable purification of 7075 aluminum alloy can be observed with rotor speed at 400 r/min and gas flow of 0.4 mL/h

refinement for 15 min as well as holding for 6 min.Hydrogen-degassing rate in C2Cl6 refinement method is approximately 34.5% while it is approximately 70% in rotary impeller degassing method.Alternatively

the hydrogen-degassing rate in combined method of C2Cl6 refinement method with rotary impeller degassing method can reach up to 78%

exhibiting acceptable purification effects.The tensile strength

yield strength and elongation of 7075 aluminum alloy refined by combined method of C2Cl6 refinement with rotary impeller degassing method are superior to those of one refined by rotary impeller degassing method which is superior to those of one refined by C2Cl6 refinement method.