▎ 摘 要
NOVELTY - A surface-treatment composition comprises a polymer resin and inorganic nanoparticles having an average aspect ratio (L/D) of 100 or more. USE - Surface-treatment composition is used for vibration damping steel sheet (claimed). Uses include but are not limited to exterior plate of refrigerator, washing machine and air purifier, engine oil pan, dash panel, and building material. ADVANTAGE - The surface-treatment composition produces vibration damping steel sheet having improved vibration damping performance and which does not easily generate cracks even when an external force is applied. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for vibration damping steel sheet, which comprises a steel sheet and a vibration damping layer containing the surface-treatment composition, provided on at least one surface of the steel sheet.