Electropolishing of copper in phosphoric acid is considered as corrosion rate of copper and due to theeconomic importance of copper there are several researches deals with acceleration and inhibition ofthis process. From the previous studies this process may be controlled by the presence of somematerials which may cause acceleration or inhibition of this process. In this paper the electropolishingprocess inhibited with different ratio by addition of some organic aldehydes ( formaldehyde,acetaldehyde, paraldehyde, benzaldehyde, salicylaldehyde, anisaldehyde, and tolualdehyde) byaddition with concentration ( 10-5 - 10-2 mol. l-1 ).The results reveal that organic aldehydes havestrongest inhibitive effect ranging from 14.3 61.9 % and the thermodynamic parameters anddimensionless group were present.
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