The use of 5-phenyl 2 H- tetrazole as a copper corrosion inhibitor was tested in 1 M aerated HCl in the 25–55 0C temperature range. The inhibition efficiency was found to increase with increasing inhibitor concentration and with increasing temperature which is due to the fact, that the rate of corrosion of Cu is higher than the rate of adsorption. The inhibiting action of this compound is considerably enhanced by the addition of KBr due to the increase of the surface coverage and therefore indicate the joint adsorption of this compound and bromide ions. In this work experimental technique has been used such as weight-loss. Results obtained from this technique is in good agreement.

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