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Ionic polymer-metal composites (IPMC) are such as smart materials which under applied voltage will be deformed and they have a broad application prospect. On the other hand, increase of surface area of this composite is directly related to bonding between electrode and polymer, as a result, polymer surface morphology is highly important, therefore, the effect of micro-blasting on the dynamic response of the composite beam is investigated. In this research, a membrane from ionic–polymer-metal composites are manufactured. Its main core is based on an electroactive core named Nafion and the electrodes are made of metals such as Platinum which is a noble metal. Then a transient voltage applied to the ionic–polymer-metal composite which was 1 volt and the displacements are measured experimentally. Finally, by the effect of micro-blasting as a surface treatment technique on the composite and comparing experimental results, a suitable equation is proposed for the behavior of this actuator under transient voltage.