Sebastjan Žagar (Author), Primož Mrvar (Author), Janez Grum (Author), Roman Šturm (Author)

Abstract

This paper investigates the corrosion of shot peened AA7075 aluminium alloys aged at different temperatures. The surface integrity of the hardened layer was evaluated with SEM, EDS, differential scanning calorimetry, hardness, and roughness measurements, and in the end also with corrosion resistance tests. The research results indicated that there were significant differences in precipitates distribution between aluminium alloys artificially aged at different temperatures. As the ageing temperature increases, the microhardness decreases, which influences the final roughness condition of the surface layer after shot peening. The results of potentiodynamic polarisation tests indicate that shot peening enables shifting the pitting potential to positive values, which ensures slightly higher corrosion resistance. SEM images confirmed the dissolution of the aluminium matrix near the separated iron-rich phases of the Alx form (Fe, Mn) by the action of galvanic cells.

Keywords

aluminijeva zlitina 7075;udarno utrjevanje;temperatura staranja;jamičasta korozija;ciklična polarizacija;aluminium alloy 7075;shot peening;ageing temperature;pitting corrosion;cyclic polarisation;intermetallic particles;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 620.1:621.787.6:669.715
COBISS: 105816579 Link will open in a new window
ISSN: 1996-1944
Views: 226
Downloads: 78
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Other data

Secondary language: Slovenian
Secondary keywords: aluminijeva zlitina 7075;udarno utrjevanje;temperatura staranja;jamičasta korozija;ciklična polarizacija;
Type (COBISS): Article
Pages: str. 1-13
Volume: ǂVol. ǂ15
Issue: ǂiss. ǂ9
Chronology: Apr. 2022
DOI: 10.3390/ma15093094
ID: 15129369