properties, and low curing shrinkage, which can be simply modified or mixed with other additives to achieve different properties. [18][19][20][21][22][23][24][25][26] Some fillers with proper size and shape, such as clay, lamellar aluminum, and micaceous iron oxide particles, can improve the barrier properties of coatings. [1][2][3][4][5][6]10,11,27] However, these fillers or particles are solid particles, it is hard and time-consuming to obtain the smaller solid particles. In addition, the traditional solid fillers are rigid, so the stress concentration is easy to occur after the coating deformation, which leads to the decline of mechanical properties.Liquid metal such as gallium or its alloy is a kind of medium that could stay in liquid phase under room temperature. Compared with ordinary solids, liquid metal can be easily prepared into particles just by sonication because of its low viscosity. [28,29] In the presence of air, the surface of gallium or EGaIn rapidly oxidizes and forms an oxide layer, which prevents it from further oxidation. So the particle has solid oxide shell and liquid metal core. The surface oxide has enough mechanical strength to keep its shape and leads to these particles having the similar properties with solid. [30][31][32][33][34] Meanwhile, they are similar to liquid capsules which deform easily and release liquid under pressure. Up to now, liquid metal has attracted considerable attention for applications in many fields. [28][29][30][31][32][35][36][37][38][39][40][41][42][43] According to metal reactivity and corrosion potential between Fe, Ga, and Zn, gallium can prevent Fe from corrosion. However, liquid metal has not been applied in corrosion protection field because it accelerates corrosion of solid metal by dissolution and pitting. Blanc et al. reported that the steels were severely attacked by the liquid metal, the contact corrosion was caused by the formation of a reaction layer identified as FeGa 3 . [44,45] Considering that the large amount of liquid metal is the condition for dissolution and pitting, we use a small amount of liquid metal to obtain particles with outside oxide layer by sonication to prepare highly dispersed coatings to avoid the disadvantage. Although a small amount of liquid metal cannot exert enough contact area to become sacrifice anode and transfer electrons for steels protection, [6,[10][11][12] these particles can improve the barrier property of the coatings because of the similarity to capsules. These capsules deform easily in coatings to fill the defects in organic coatings, while traditional solid particles do not have this property. These deformed liquid Compared with the traditional solid fillers, liquid metal can be easily treated into small particles similar to liquid capsule just by a sonication method. Epoxy-based coatings containing liquid metal (EGaIn) particles are prepared easily via a straightforward method, and its corrosion performance and mechanical property of the coating are investigated. The results show that a small amount of liqu...
