الفهرس 
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Abstract
The present work deals with the study of the effect
polymer dddit~on on the rate of mass transfer ~n the br>corrosion oy Al in acids and alkalies, and the possibility of using drag reducing polymers as inhibitors • br>Rate of corrosion of Al tube through which Hcl and Na OH are flowing was measured by the loss in weight
technique • Polymers used were polyethylcnc oxiie and
carboxymEthyl cellulose. The following results We~2 £0und:
1. Inl:aminar flow, the polymer addition afi’oct ::;lighJcly
the rate of corrosion in acid or alkaline medium
2. In turbulent flow regim~, polymer addition decreases
significantly the rate of corrosion •
3. Polymer addition decreases the mass transfer coeffi-
cient in turbulent flow in bo~h acidic and alkaline ~odia •
4. ~he extent of decrease in the mass transfer coefficient was found to depen~ on the polymer concentration
and the velocity of the fluid •
5. The inhibition efficiency of the polymer molecules increas~with increasing solution flow rate and polymer
concentration •
6- Polyoxis more effective in acid medium than in alkaline medium •
7- In all:aline medium polyox is more effective corro- br>eion inhibitor than CMC •
The dramatic decrease in the rate of corrc3ion of pipes containing turbulently flowing cor=~ei7~ fl\lids as in the present work suggests stron&ly the uce ~£ drag
’reducing polymers as corrosion inhibitors in pra~ti8s • < In this case the polymer would have a dual function,
• namely, the polymer will reduce the drag between t~e
flowing fluid and the tube wall with a consequen~ reduc- tion in the pumping power requirement , in addition, the polymer will act as an effective corrosion inhibitor with a consequent prolongation of the life time of the pipe line •