V-shaped steel plates are utilized in the construction of various structures, including roofs and walls of buildings, warehouses, ships, beams and girders, airplane hangars, and military vehicles, due to their lightweight and high strength. Studying the free vibration behavior of these plates is significant for understanding the true performance of structures. Exposure to unfavorable weather conditions can lead to corrosion phenomena. The impact of corrosion on the geometric and mechanical properties of steel structures can result in severe damages, including partial destruction of the structure or its collapse over time. This phenomenon highlights the importance of examining and analyzing corroded structures. For this purpose, this research analyzes the frequencies and modes of various V-shaped plates with uniform, strip, or localized corrosion under different boundary conditions, including free, hinged, and fixed conditions, with corrosion intensities of 2.90%, 8.90%, and 15.70%, respectively. The finite element software Abaqus has been used for modeling and data analysis. The results indicate that corrosion typically leads to a reduction in frequency values and changes in the modes of the plates. For example, for a plate with a length of 2 meters, a width of 1 meter, a thickness of 20 millimeters, an internal angle of 45 degrees, and four-sided hinged boundary conditions, the frequencies for corrosion intensities of 2.90%, 8.90%, and 15.70% are 90.04, 84.76 and 77.45 (Hz), respectively.