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8413083 
Journal Article 
Corrosion resistance of black phosphorus nanosheets composite phosphate coatings on Q235 steel 
Wang, M; Ma, R; Du, A; Hu, S; Muhammad, M; Cao, X; Fan, Y; Zhao, X; Wu, J 
2020 
1 
Materials Chemistry and Physics
ISSN: 0254-0584
EISSN: 1879-3312 
ELSEVIER SCIENCE SA 
LAUSANNE 
250 
123056 
English 
WOS:000540353500037 
To improve the corrosion resistance of phosphate coatings on Q235 steel, black phosphorus (BP) nanosheets in a phosphating solution were applied. Through X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical tests, the effects of different BP nanosheet concentrations on the composition, morphology, and corrosion resistance of the phosphate coatings were studied. The results indicated that the composition of the phosphating coatings did not change, but their morphology did. The addition of BP nanosheets (0–0.2 g/L) increased the number of sites and decreased the grain size, resulting in the formation of a denser, heavier, and thicker phosphate coating structure. The densest and most uniform coating was obtained at a BP nanosheet concentration of 0.1 g/L. The corrosion current density and rate of the phosphate coating decreased by one order of magnitude. Electrochemical impedance spectroscopy revealed that the coating resistance was four times higher than that of the coating without the BP nanosheets, and the highest corrosion resistance was achieved at this concentration. © 2020 Elsevier B.V. 
Black phosphorus; Corrosion resistance; Electrochemical impedance spectroscopy; Phosphate coating; Q235 steel