Without the addition of inorganic acids, 2,5-Diaminobenzenesulfonic acid (DABSA) molecules form an acid environment, and are then electrochemically copolymerized with AN monomers to generate a self-doped polyaniline (SPAN) film on mild steel substrates. These SPAN deposition films are employed to test the protection efficiency for mild steel in a corrosion environment of HCl and NaCl, respectively. Electrochemical impedance spectroscopy (EIS) and polarization were used to determine the charge transfer resistance (Rct) and corrosion current (Icorr), respectively. The above two parameters Rct and Icorr are combined to evaluate the protection efficiency of SPAN film on mild steel. Experimental results show that the SPAN thin film with the AN/DABSA ratio of 8.8 has the optimal corrosion resistance in 1 M HCl and 1 M NaCl aqueous solutions, respectively.
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机译：在不添加无机酸的情况下，2,5-二氨基苯磺酸（DABSA）分子形成酸性环境，然后与AN单体进行电化学共聚，从而在低碳钢基材上生成自掺杂聚苯胺（SPAN）膜。这些SPAN沉积膜分别用于测试在HCl和NaCl腐蚀环境下对低碳钢的防护效率。电化学阻抗谱（EIS）和极化分别用于确定电荷转移电阻（Rct）和腐蚀电流（Icorr）。结合以上两个参数Rct和Icorr来评估SPAN膜对低碳钢的保护效率。实验结果表明，AN / DABSA比为8.8的SPAN薄膜分别在1 M HCl和1 M NaCl水溶液中具有最佳的耐腐蚀性。
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