Slurry erosion-corrosion characteristics of squeeze cast aluminum alloy-aluminum borate composite

Citation
Jp. Tu et al., Slurry erosion-corrosion characteristics of squeeze cast aluminum alloy-aluminum borate composite, MATER CORRO, 50(4), 1999, pp. 205-212
Citations number
26
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
ISSN journal
09475117 → ACNP
Volume
50
Issue
4
Year of publication
1999
Pages
205 - 212
Database
ISI
SICI code
0947-5117(199904)50:4<205:SECOSC>2.0.ZU;2-0
Abstract
The slurry erosion-corrosion behavior of 19.5 vol.% Al18B4O33 whisker reinf orced AC4C Al composite in aqueous slurry containing 3.5 wt.% NaCl and 20 w t.% silica has been investigated using a jet-in-slit rig. Erosion-corrosion tests were performed with slurry having a jet velocity range 6.4 ms(-1) to 15.2 ms(-1) and at normal impact angle. The results indicated that the slu rry erosion-corrosion characteristics were affected by the slurry velocity and material properties. At low slurry velocities, as compared to the unrei nforced alloy, the erosion-corrosion resistance of the composite was improv ed because of increase in hardness as a result of whisker addition. However , steady-state erosion-corrosion rate was found to increase with the additi on of whisker to the matrix alloy at high slurry velocities. The erosion-co rrosion rates of materials in the saline slurry were much higher than those in the water slurry even though the corrosion components were very small. It is found that the synergistic factor for the materials reduced with incr easing slurry velocity although the synergism between erosion and corrosion was greater at high slurry velocity. Localized corrosion occuring in the s train-hardened layer caused a decrease in the fracture strain of composite during erosion-corrosion. in the saline slurry, the material removal was en hanced through cracking of flakes and detaching of whisker induced by stres s and corrosion.