Zinc-graphite composite coating for anti-fouling application
Gongguan Wang ；Liqun Zhu ；Huicong Liu ；Weiping Li
Materials Letters
In this paper, an anti-fouling composite coating was fabricated by blending zinc-graphite alloy powders with epoxy-silicone resin and characterized by EDS, SEM, XRD and ion titration. Compared with stainless steel and epoxy-silicone resin coating, the composite coating significantly inhibited the deposition of CaCO_3 fouling. Only a small amount of fouling was observed on the surface of composite coating after it was immersed in CaG_2/NaHCO_3 solution. The galvanic corrosion of zinc-graphite powders could release Zn~(2+) ions, which can reduce partially the nucleation and crystal growth rate of CaCO_3 on the surface of composite coating. It was found that the morphologies of CaCO_3 fouling changed from calcite to aragonite as the existence of composite coating. Meanwhile, CaCO_3 fouling was prone to precipitate in bulk solution rather than on the surface of composite coating.
keywords: corrosion surfaces composite coating anti-fouling zn~(2+) ions
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