Corrosion of 2024 alloy after ultrasonic impact cladding with iron

ABSTRACT

The iron-containing layers were produced on the 2024 alloy surface using ultrasonic impact treatment (UIT) in the ambient air and argon environment. Multiple high-energy collisions of the pin of Armco-iron by the treated surface induce the iron cladding by means of solid-state welding of Fe dopants and Al substrate. SEM and EDX analysis and microhardness measurements showed a formation of oxide/intermetallic layers, which thickness ranges from 15–20 to 30–35 μm and hardness achieves ∼4 and ∼9 GPa after the argon-UIT and air-UIT processes, respectively. The polarisation tests in 3.5%NaCl medium showed that the layers are characterised by lower corrosion rates and more positive corrosion potentials than those of the original alloy owing to the formation of Al_x-Fe_y intermetallics. The noblest behaviour was registered for the air-UIT-processed 2024 alloy.

KEYWORDS:

• Ultrasonic impact treatment
• mass-transfer
• mechanical alloying
• surface modification
• aluminium alloys
• pitting corrosion

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

B. N. Mordyuk http://orcid.org/0000-0001-6025-3884

A. P. Burmak http://orcid.org/0000-0003-2415-8032

Additional information

Funding

This work was supported by the Ministry of Education and Science of Ukraine [0115U002320]; National Academy of Sciences of Ukraine [0114U001127].