磷化碳钢上聚四氟乙烯涂层腐蚀行为

摘要以20#碳钢样片为基底材料，采用浸渍提拉法，在经磷化的碳钢样片基底上，制备了膜厚为13（±2）μm的聚四氟乙烯疏水涂层，并对其物理化学性能和腐蚀情况进行了表征。结果表明，普通的磷化碳钢表面，其磷化颗粒晶体尺寸比较粗大，且颗粒分布不均匀；采用磁力搅拌的磷化碳钢表面，其磷化颗粒晶体尺寸细小而致密。所制备的磷化膜由Zn₃（PO₄）₂·4H₂O、Zn₂Fe （PO₄）₂·4H₂O和Mn₂Zn （PO₄）₂·4H₂O 3种物质组成，其中，Zn₂Fe （PO₄）₂·4H₂O为主要组分。聚四氟乙烯涂层的主要组分是聚四氟乙烯和少量的四氟乙烯。浸泡5 d后PTFE涂层对3.5% NaCl溶液的屏蔽作用显著减弱，涂层的耐蚀性大幅下降，结合涂层样片的交流阻抗谱和等效电路拟合结果对PTFE涂层在3.5% NaCl溶液中的腐蚀机理进行了分析。

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	何吉喆
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关键词：碳钢磷化聚四氟乙烯腐蚀

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.

Keywords： carbon steel； phosphating； polytetrafluoroethylene； corrosion

Received 2021-01-21;

Fund:国家重点研发计划资助（2019YFB1504104）。

Corresponding Authors: 刘明言,教授,E-mail:myliu@tju.edu.cn。 Email: myliu@tju.edu.cn

About author: 何吉喆(1994-),男,硕士,现从事耐腐蚀技术方面的研究。

引用本文:

何吉喆, 刘明言.磷化碳钢上聚四氟乙烯涂层腐蚀行为[J]. 化学工业与工程, 2022,39(2): 108-116

HE Jizhe, LIU Mingyan.Corrosion behavior of polytetrafluoroethylene coating on phosphated carbon steel[J]. Chemcial Industry and Engineering, 2022,39(2): 108-116

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