The anticorrosive action of the two compounds: 4‐(p‐chlorobenzylidene‐amino)‐3‐hydrazino‐5‐thio‐1,2, 4‐triazole (I) and 4‐(p‐chloro‐benzylideneamino)‐3‐(p‐chlorobenzy‐lidenehydrazino)‐5‐thio‐1,2,4‐triazole (II) against marine corrosion have been tested using four different marine paint compositions containing the compounds. The paints were applied on steel panels and tested in a sea‐water medium. The same paint formulations were tested for antifouling activity by applying the paints containing the compounds on PVC panels and immersing them in the water of Alexandria western harbour. The formulations based on compounds (I) showed better steel protection than their analogue containing compound (II), and protect their surfaces from marine corrosion for about seven months.
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