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In order to determine the most suitable composite coatings to inhibit corrosion inthe oil tanks, the protection method was studied by the method of multiple layers ofprotection. Where there were three layers of protection, the base layer is a phosphateprocess using zinc phosphate, the second layer is a base painting (Hydrazine Hydratewith an epoxy zinc coating), while the top layer was a composite coating matrix ofunsaturated polyester and epoxy supported by different fraction weight ofnanomaterials. The top layer was supported by nano kaolin with 1% weight fraction,nano magnesium oxide with 3% weight fraction and nano zinc oxide with 5% weightfraction. The three layers were painted on metal pieces (1.5cm*1.5cm) of corrodedtanks used to store diesel fuel. The hardness of the metal parts was studied before andafter the phosphate process, where the results showed that the sample surface hardnesswas 123 HB and after the phosphate process was 131 HB.The chemical corrosion and electrochemical corrosion test were carried out for agroup of samples that were painted only once with a topcoat and again with three layersof paint. The results showed that the best protection against corrosion is the sample thatpainted with three layers of coating, and the top coating supported by a nanomagnesium oxide, it has lowest corrosion current value (162.59 nA/cm2). Furthermore,the adhesion test showed that the coating supported by nanomaterials have higher adhesion strength than those that are not supported by nanomaterials. Where the highestadhesion strength was (776 Psi) for magnesium oxide nanoparticle coating.

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