Corrosion behavior of polytetrafluoroethylene coating on phosphated carbon steel

Abstract Using 20# carbon steel material as the substrate, after the phosphating pretreatment, a hydrophobic PTFE coating with a thickness of 13(±2) μm was prepared on the phosphating carbon steel by dipping and pulling method. The surface of the ordinary phosphating carbon steel is relatively coarse and uneven, while the size of the phosphating particles on the surface of the phosphating carbon steel using magnetic stirring is small and dense, and the crystal size is smaller than that of the ordinary phosphating. The prepared phosphating film is composed of Zn₃(PO₄)₂·4H₂O, Zn₂Fe(PO₄)₂·4H₂O and Mn₂Zn(PO₄)₂·4H₂O. Among them, Zn₂Fe(PO₄)₂·4H₂O is the main component. The main components of the PTFE coating are PTFE and a small amount of TFE. After immersing for 5 days, the shielding effect of the PTFE coating on the 3.5%NaCl solution is significantly weakened, and the corrosion resistance of the coating is greatly reduced. The corrosion mechanism of the PTFE coating in 3.5% NaCl solution was analyzed based on the AC impedance spectrum of the coating sample and the equivalent circuit fitting results.

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	HE Jizhe
	LIU Mingyan

Keywords： carbon steel； phosphating； polytetrafluoroethylene； corrosion

Received 2021-01-21;

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HE Jizhe, LIU Mingyan.Corrosion behavior of polytetrafluoroethylene coating on phosphated carbon steel[J] Chemcial Industry and Engineering, 2022,V39(2): 108-116

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