塗膜のキャビテーション壊食に及ぼす膜厚の影響

抄録

The influences of film thickness of vinyl and silicone resin coatings on cavitation erosion were examined quantitatively in seawater using a vibratory apparatus. The maximum instantaneous volume loss rate indicates the increase, decrease, or constant with a decreased top coat thickness less than the critical thickness, depending on the combination of the top coat and primer of the acoustic impedance. The critical thickness can be calculated approximately from the duration of impulsive force and propagation velocity of a longitudinal wave created by the collapse of a cavitation bubble, when covered with a resin coating material.