الفهرس 
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Abstract
Ra te o:f di:f:fusion controlled corrosion o:f agi ta ted vessels containing solid suspension were studied by determ¬ining the rate o:f the di:f:fusion controlled dissolution o:f the vessel wall (copper) in acidi:fied :ferric chloride solution. Variables studied were physical properties o:f the solution (~. 1’. D), impeller rotation speed, particle size and par¬ticle’s concentration; the study revealed the :following
resultS:
1- The rate o:f corrosion o:f the copper wall o:f the vessel in
acidi:fied :ferric chloride solution was :found to obey
the equation
_ V dc/dt = K A C
2- The mass trans:fer coe:f:ficient o:f the corrosion o:f the agi-
tated vessel wall increases with increasing the rotat¬ional speed o:f the impeller according to the equation :
K = a WO.708
3- The mass trans:fer coe:f:ficient o:f the corrosion o:f the agi-
tated vessel wall was related to other parameters using
the method o£ dimensional analysis; the £following equation was obtained £or particle £ree solutions:
Sh = 0.01 scO•33 ReO.708
£or the conditions: 65000<Re<170000 and 1680 < Sc< 1900 with an average deviation o£ 8±, .
The rate o£ di££usion controlled corrosion o£ the vessel wall was £ound to increase by an amount ranging £rom 9, To 330,. In the presence o£ suspended solid particles. The percentage increase in the rate o£ corrosion depends on particle size and particle concentration. The rate o£ corrosion increases with decreasing the particle size and increasing particle concentration.
5- In the presence o£ suspended particles, the mass transfer coe££icient. O£ the corrosion o£ the vessel wall was rel¬ated to the impeller rotation speed by the equation:
K = a Lun
The exponent n ranges £rom O.l.l- to 0.66 depending on particle
Size and particle concentration.