Aluminum alloy forgings generally require surface cleaning after forging. The next step is the standard surface cleaning process, which can remove residual lubricants and oxide scales to obtain a smooth surface with natural luster.
() Soak in NaOH aqueous solution containing 4% to 8% by mass at 70 ℃ for 0.5 to 5 minutes.
() Immediately rinse with hot water at 75 ℃ or higher for 0.5-5 minutes.
(3) Soak at 88 ℃, 10% volume percentage, and remove black precipitate in nitric acid aqueous solution.
() Rinse in hot water at 60-70 ℃ for 3-5 minutes.
33 3 cleaning times and aluminum alloy forging process, some forgings only need to be cleaned before inspection.
