Selective dissolution during acid pickling of aluminum alloys by element-resolved electrochemistry

• The surface reactivity and the elemental dissolution of a high-strength aerospace alloy (AA7449-T651) during acid pickling was investigated with element-resolved electrochemistry (AESEC). The results demonstrated a sequential dissolution of Mg, Al, Zn and Cu, following the order of their respective galvanic reactivity in common acid pickling solutions. The enrichment of Cu during pickling with the H2SO4 solution was observed. The effect of oxidizing solution components HNO3 and Fe(III) on Cu dissolution were investigated using an experimental Evans diagram approach. 

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

AA7449

Acid pickling

AESEC

Alloy

Aluminum

Aluminum alloys

Copper

Dissolution

Electrochemistry

Iron compounds

Aerospace alloys

Cu dissolutions

High-strength

Pickling solutions

Selective dissolution

Solution components

Surface reactivity

High strength alloys

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)