Acid cleaning covers the chemical treatment of aerospace metallic components — including aluminium, titanium, nickel superalloy and steel parts — using controlled acidic solutions such as nitric, hydrofluoric, hydrochloric or sulphuric acid to remove oxides, scale, heat tint, smut and contaminants prior to subsequent surface treatments, with processes typically governed by specifications such as AMS 2750 and NADCAP audit requirements.
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