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The purpose of this study was to evaluate the corrosion protective property in steel applying Zn-Al metal spray system (KMS system). In the experiment, the CASS test and the electrochemical test was conducted to investigate the corrosion protective property of the KMS system, the Zinc galvanizing system and the heavy duty coating system. As a result, it was confirmed that the KMS system had very high corrosion protective property through the electrochemical characteristic comparing the other anti-corrosion system and had very effective to prevent steel products from corrosion.