Effect of common water contaminants on the corrosion of aluminium alloys in ethylene glycol–water solution

2008 ◽  
Vol 50 (1) ◽  
pp. 242-247 ◽  
Author(s):  
Olusegun K. Abiola ◽  
J.O.E. Otaigbe
2009 ◽  
Vol 7 (3) ◽  
pp. 461-467
Author(s):  
Maria Antunes ◽  
Helena Santos ◽  
Persio Santos

AbstractThe present work shows the growth of nordstrandite microcrystals observed by transmission and scanning electron microscopy. Nordstrandite was synthesised from non-crystalline aluminium hydroxide reacted in 20% ethylene glycol/water solution, at room temperature. This material was characterized by TEM, SEM, SAED, XRD and EDS/TEM, during six month and revealed the formation and growth of nordstrandite. Fibrillar pseudoboehmite is the only aluminium hydroxide which could be identified during the first two weeks. The nuclei grow, from complete dissolution/recrystallization of pseudoboehmite fibrils, into platy rectangular microscrystals of nordstrandite. Some tabular microcrystals recrystallise, forming after six months only the multi-point nordstrandite stars. This electron-optical study suggest that the star shape results from the overlapping of rectangular plates, and pseudoboehmite fibrils act as the precursor of nordstrandite crystallisation in ethylene glycol/water solution.


2016 ◽  
Vol 29 (4) ◽  
pp. 1142-1150 ◽  
Author(s):  
Xin Chen ◽  
Wenming Tian ◽  
Songmei Li ◽  
Mei Yu ◽  
Jianhua Liu

Author(s):  
Gustavo J. Molina ◽  
Fnu Aktaruzzaman ◽  
Valentin Soloiu ◽  
Mosfequr Rahman

Nanofluids are suspensions of nanoparticles in ordinary coolants, but their tribological effects on heat-exchanger materials are unknown. Previous research has explored wear from distilled-water-base nanofluids only, while most engine-coolants are alcohol solutions in water. This article presents testing of aluminum and copper by jet impingement of 50%-ethylene-glycol in water solution and of its 2%-alumina nanofluid. The effects are investigated of nanoparticle addition on the anticorrosion protection provided by ethylene glycol. The observed modifications showed that ethylene-glycol in water nanofluid led to wear patterns that were different than those obtained with the base-fluid; nanoalumina addition enhanced erosion and corrosion on aluminum and copper. Comparing the effects of ethylene glycol and its nanofluid solutions to those from same tests performed with distilled-water and its nanofluid suggests that nanopowders can substantially enhance wear by decreasing the anticorrosion action of ethylene glycol by a synergetic mechanism of erosion-corrosion


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