The conservation strategy for metallic artifacts includes different steps. One of these steps is the preventive conservation. After cleaning of the metallic objects, it is follows the protection process to safe the artifacts for long time from the deterioration factors. Corrosion inhibitors and protective coatings are highly recommended for protecting metals from degradation and corrosion process. This paper studied some laboratory tests of five corrosion inhibitors and protective coatings on bronze samples due to evaluate the efficiency of these materials to be apply on bronze artifacts. Two derivatives of acrylics, (Paraloid B72 and B82), two Amino acids (Cysteine and Valine), and Benzoteriazol (BTA) with concentration 3% were compared as a protective coating. Two laboratory assessment methods are used, weight loss and polarization tests. Bronze samples are divided into six groups, the first group is a blank group and the others apply one material for each group and each group contains three samples. The tested samples are exposed to 1M copper chloride solution for 24 hours and measures are recorded. After this the materials were applied on samples and exposed to temperature 40oC and humidity 100% for 24 hours in a controlled chamber. Weight loss test illustrated that the efficiency of the materials are, Cysteine efficiency record 99.71%. Paraloid B72 efficiency is 99.42% compared to other materials. The electrochemical test illustrated that the best protection efficiency of these Matrials are Paraloid B82 which is 99.74% and Paraloid B72 which is 99.64 %.