Corrosion Protection of Molybdenum-Phosphorus Compounds Based Coating Formed on Hot Dip Galvanized Steel in a Cl- Ione Environment

Wan Qiu Zhou; Yan Rong Liu; Jian Wang; Li Sheng; Shi Wei Wu; Yan Hong Kang

doi:10.4028/www.scientific.net/AMR.750-752.2017

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Corrosion Protection of Molybdenum-Phosphorus Compounds Based Coating Formed on Hot Dip Galvanized Steel in a Cl^- Ione Environment

Abstract:

Molybdate-phosphate conversion coating was prepared by adding addition agent towards molybdenum-phosphorus compounds based bath on comercial hot dip galvanized steel. The anti-corrosion performance of the coating was evaluated by electrochemical technique in 3.5%NaCl. It is found that the anodic branch of polarization curves presented in passivation character. Electrochemical impedance spectroscopy (EIS) results indicate that the radius of the capacity impedance for molybdate-phosphate film increased distinctly with pH decrease, which validate the excellent anti-corrosion performance of the film. The surface morphologies were observed using scanning electron microscopy (SEM), and the results show that the surface of hot dip galvanized steel is covered by a spiculate and floccule shape conversion coating. The chemical composition of the surface coating was investigated by energy dispersive X-ray (EDX), which illustrate that the conversion coating is composed of zinc,oxygen, phosphor and molybdenum.