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butyric acid, and 3-acetyl indole) on scale dissolution during the pickling of mild steel in S. TURGOOSE 10%HCl has been investigated by means of corrosion potential measurements and scanning A. A. ISMAIL electron microscopy (SEM). T he results have shown that indole and 3-acetyl indole have S. H. SANADthe highest inhibition eYciencies of 98 and 96% respectively. However, while 3-acetyl indole slightly retarded dissolution of the oxide scale, indole accelerated the scale removal process.

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