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Analysis of the Microstructure and Selected Properties of the Aluminium Alloys Used in Automotive Air-Conditioning Systems

1
Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Krakow Mickiewicza 30 Av., 30-059 Krakow, Poland
2
Faculty of Management, AGH University of Science and Technology, Krakow Gramatyka 10, 30-067 Krakow, Poland
3
Maflow, Boryszew Group, Tychy Serdeczna 42, 43-100 Tychy, Poland
*
Author to whom correspondence should be addressed.
Metals 2018, 8(1), 10; https://doi.org/10.3390/met8010010
Received: 6 December 2017 / Revised: 22 December 2017 / Accepted: 22 December 2017 / Published: 28 December 2017
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Abstract

The results of microstructure examinations and studies of selected mechanical properties of four aluminium alloys used in the production of automotive air-conditioning ducts (AA3103, AA5049, AA6060, AA6063) before and after the ASTM G85:A3 SWAAT Test (Sea Water Acetic Acid Test) for corrosion resistance are presented. Materials used for the manufacture of such components should be temperature stable, and therefore thermal resistance tests were carried out in a wide range of temperatures, i.e., −25 °C, 25 °C, 40 °C, 60 °C, 80 °C, 100 °C, 140 °C, 180 °C, and 220 °C. Annealing was performed for 72 h and 240 h, followed by cooling in water. The obtained results have proved that the non-precipitation-hardenable AA3103 and AA5049 alloys remain stable in the entire range of the investigated temperatures. The measured microhardness of these alloys was 43–46 HV0.1 for AA3103 and 56–64 HV0.1 for AA5049. The microhardness of the 6xxx series aluminium alloys was not stable in the investigated range of temperatures. The maximum was observed in the temperature range of 100–140 °C, which corresponded to the precipitation process of intermetallic phases, as further confirmed by microstructure observations. After the corrosion test, the mechanical properties and elongation decreased by about 5–20%. View Full-Text
Keywords: automotive air-conditioning system; aluminium alloys; heat treatment; microstructure investigations; SWAAT test; mechanical properties automotive air-conditioning system; aluminium alloys; heat treatment; microstructure investigations; SWAAT test; mechanical properties
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Leszczyńska-Madej, B.; Richert, M.; Wąsik, A.; Szafron, A. Analysis of the Microstructure and Selected Properties of the Aluminium Alloys Used in Automotive Air-Conditioning Systems. Metals 2018, 8, 10.

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