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- Title
EFFECT OF PRE-AGEING THERMAL CONDITIONS ON THE CORROSION PROPERTIES OF ANTIMONY-MODIFIED Al-Si-Mg ALLOY.
- Authors
Adeboye, G. O.; Abdulwahab, M.; Asuke, F.; Yaro, S. A.
- Abstract
The purpose of this investigation was to evaluate the effect of pre-ageing thermal conditions on the corrosion properties of antimony-modified Al-Si-Mg alloy. The alloy was subjected to a Single Thermal Ageing Treatment; STAT (T6 temper-solution heat treatment and ageing) and Double thermal ageing treatment; DTAT (T7 tempersolution heat treatment and ageing for stabilization). These consist of solution heat treatment (SHT) at 540°C for 1hr, water quenched followed by an artificial ageing; DTAT and STAT. For the single thermal ageing treatment (STAT), quenched samples were aged at temperatures of 180°C for 2hrs, before cooling in air. In the double thermal ageing treatment (DTAT), quenched samples were pre-aged at a temperature of 90°C, 105°C and 120°C for 1-5 hrs. This was followed by ageing at 180°C for 2hrs before cooling in air. The corrosion characteristic of the as-cast, Single Thermal Ageing Treatment (STAT) and Double Thermal Ageing Treatment (DTAT) were evaluated using weight loss and linear polarization techniques in a static 3.5% NaCl solution. From the results, the corrosion rate decreases with increasing pre-ageing time and temperatures. Equally, from the linear polarization data/curves, the corrosion rate of the treated alloy decreases at all ageing temperatures along with the ageing time. The Optical Microscope (OM) results of as-corroded samples revealed that the alloy suffers pitting/uniform corrosion. The corrosion behaviour of the DTAT samples in simulated seawater showed an excellent improvement in corrosion resistance than the as-cast and conventional STAT alloy.
- Subjects
ANTIMONY; ALLOYS; HEAT treatment; LINEAR polarization; OPTICAL microscopes
- Publication
Nigerian Journal of Technology, 2015, Vol 34, Issue 4, p705
- ISSN
0331-8443
- Publication type
Article
- DOI
10.4314/njt.v34i4.6