She teaches you aluminum alloy forging process change how to clean up?

(1) containing 4% ~ 8% (mass percent) in the aqueous solution of NaOH, under 70 ℃ impregnated 0.5 ~ 5 min.

(2) under 75 ℃ or higher temperature of hot water immediately flush 0.5 ~ 5 min.

(3) in 88 ℃, 10% (volume percentage) of nitric acid in aqueous solution, and to remove the black sediment.

(4) in 60 ~ 70 ℃ hot water rinse 3 ~ 5 min.