Copper chrome boron (CCB) is a well-known new-generation wood preservative. In this study, the corrosion inhibition performance of CCB on St37 steel in 3.5% (w/v) NaCl was examined using dynamic electrochemical impedance spectroscopy (DEIS), potentiodynamic polarization, and scanning electron microscopy. Results of corrosion tests on the system under investigation revealed that CCB displayed inhibitor properties, behaving predominantly as a slightly anodic inhibitor. Scientifically, this work can contribute to an understanding of the mechanism of corrosion of St37 steel fasteners used with CCB-treated and untreated wood.