Journal
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
Volume 57, Issue 2, Pages 97-104Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/1478422X.2021.1994107
Keywords
Al-Si-Mg alloy; near-surface deformed layer; corrosion; grain refinement; alloy wheels
Funding
- Engineering and Physical Sciences Research Council [EP/G036950]
- EPSRC [EP/S004963/1] Funding Source: UKRI
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The study found that mechanical grinding significantly affects the microstructure and corrosion performance of A356 alloy castings, especially causing preferential dissolution of the near-surface deformed layer when exposed to NaCl solution. This results in trenching of the aluminium matrix around the eutectic silicon particles.
In the automotive industry, mechanical grinding is employed at finishing line rectification to remove defects left over from upstream, which may also result in microstructure modification within the near-surface region of the work piece and, consequently, affects its corrosion performance. The present work investigates the influence of mechanical grinding on the microstructure modification and corrosion behaviour of Al-Si-Mg (A356) alloy castings in order to advance the understanding of potential corrosion issues. It is found that a near-surface deformed layer with a maximum thickness of 3 mu m, characterised by ultrafine equiaxed grains of 50-150 nm diameter, is introduced by the grinding process on alpha-aluminium matrix. The near-surface deformed layer has a significant impact on the corrosion behaviour of the alloy; specifically, preferential dissolution of the near-surface deformed layer occurs when exposed to NaCl solution, together with trenching of the aluminium matrix around the eutectic silicon particles.
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