Surface Treatment of Recycle Aluminium Alloy for Improvement of Color Adherence Property
Keywords:
Surface Pretreatment,, Recycle Aluminium Alloy,, Color AdherenceAbstract
This research studied the effect of the soaking time of recycle aluminium alloy and the NaOH concentration on surface roughness, weight loss of specimen and color adhesion-pull-off test on recycle aluminium alloy surface to sand mold casting. The testing conditions were soaking time in the range of 1-24 hours and NaOH concentration in the range of 0.75-1.25 molars. The results were compared to the specimen that was not immersed in NaOH. It was found that the pretreatment caused the roughness to develop on recycle aluminium alloy surface at ninth hour after that was decreased. Weight loss of specimen rapidly increased when an increase of soaking time increased at 0-9 hours and later turned steady. The most effective adherence occurred at ninth hour with the concentration at 0.75 molar due to the less metal loss. The area loss was 0.13%. In comparison, the one that was not immersed in NaOH showed the thickness of oxide surface at 7 micrometers and the area loss was at 86.42%.
References
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