Preparation and corrosion resistance of surface coatings on steel for construction
In order to improve the surface corrosion resistance of Q345 steel for construction,Ni-P and Ni-P-PTFE(polytetrafluoroethylene)composite coatings were prepared on the surface of construction steel by electroless plating.The effect of the concentration of PTFE colloid on the surface morphology and corrosion resistance were investigated.The results showed that amorphous structures were visible in both Ni-P and Ni-P-PTFE coatings.After adding PTFE to the plating solution,Fe3 C and P4 S3 phases were also formed in the Ni-P-PTFE coating.After adding different concentrations of PTFE colloid into the plating solution,the Ni/P atomic ratio of the Ni-P-PTFE coating decreases in varying degrees(between 4.08 and 5.04).With the increase of the concentration of PTFE lotion,the content of F element in the coating gradually increases,and the Ni/P atomic ratio gradually increases.When the concentration of PTFE colloid is 0.4 mL/L,the Ni-P-PTFE coating surface is relatively flat and smooth,and the micropores formed on the coating surface due to the dehydrogenation reaction disappear.The corrosion resistance of Ni-P-PTFE coatings with different concentrations of PTFE colloid is better than that of Ni-P coating,and the coating has the best corrosion resistance when the concentration of PTFE colloid is 0.4 mL/L.Ni-P-PTFE coating on Q345 steel for construction can obtain good corrosion resistance,and the appropriate concentration of PTFE colloid is 0.4 mL/L.
steel for constructionsurface coatingconcentration of PTFE colloidmicroscopic morphologycorrosion resistance
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