Abstract
The dissolution of magnesium, aluminium, and silicon from S-glass rovings in water at 30, 40 and 50° C and from S-glass powders in water at 40° C has been studied. The concentrations of magnesium and silicon reached 2 mgl−1 or more depending upon the temperature and length of contact time, while the aluminium concentration reached no more than 0.2 mgl−1. The preferential leaching out of Mg (or MgO) by water from S-glass could be the initial step which causes and aggravates the degradation of S-glass filament reinforced composites. Weak ammonia solutions ranging from 0.04 to 0.00008 M enhanced the dissolution of aluminium and magnesium, especially that of the former. In the experiments with S-glass rovings in boiling water in Pyrex glass flasks, complications arose as a result of the interactions between the alkaline ingredients of the Pyrex wares and the ingredients of S-glass. Rate relations are proposed and discussed for the dissolution process.
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Abbreviations
- C g :
-
concentration of Mg in bulk glass (g cm−3)
- C gs :
-
concentration of Mg at the glass surface (g cm−3)
- C l :
-
concentration of Mg in liquid film immediate to glass surface (g cm−3)
- C b :
-
concentration of Mg in bulk liquid (g cm−3)
- D g :
-
diffusivity of Mg in solid phase (cm2sec−1)
- D l :
-
diffusivity of Mg in liquid phase (cm2sec−1)
- E a :
-
dissolution activation energy of Mg for S-glass-water system (cal g.mol−1)
- k d :
-
detachment rate coefficient of Mg from S-glass to water (cm sec−1)
- m :
-
reaction order for surface area
- n :
-
reaction order for concentration driving force
- R :
-
universal constant (cal g.mol−1 K−1)
- S :
-
surface area (cm2)
- T :
-
temperature (° K)
- V :
-
liquid volume (cm3)
- W :
-
mass of Mg in S-glass rovings used (g)
- α :
-
overall mass transfer coefficient, g Mg transferred per (sec) (cm2) (g Mg cm−3), or cm sec−1
- α′ :
-
proportionality coefficient in Equation 1
- β :
-
dimension correction factor betweenk d andk l, dimensionless
- δ :
-
solid phase diffusion path length (cm)
- ge :
-
equilibirum coefficient between Mg in the liquid phase and in the solid phase, dimensionless.ε=C l/C gs
- θ :
-
time (sec)
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Paper presented at the American Institute of Chemical Engineers meeting, Atlantic City, New Jersey, 29 August–1 September 1976.