Preparation and Anti-corrosion Performance of Organosilicon Composite Coatings on Carbon Steel
Thin organosilicon composite coatings were prepared on carbon steel surface through wet chemical method,employing methyl trichlorosilane(MTS)and tetraethyl orthosilicate(TEOS)as precursors,along with Fe-Cr alloys and graphite powder as pigments.The results show that the organosilicon system bonded by the Si—O—Si bond is hydrolyzed and polymerized by MTS and TEOS,resulting in uniform filling of inorganic phases within the network structure.The composite exhibits a flat and dense morphology,with the pencil hardness of 7 H,the adhesion of Level 1,and the water contact angle of 73°.After soaking in a 3.5 wt%NaCl solution for 60 days,there is an increase in corrosion current density while the hardness and adhesion decrease.However,it still remain higher than those observed on pure coated steel during the same period,because the filling effect of fillers enhances the barrier effect,hardness and adhesion.
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