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The appositeness of conducting polymers to enrich the corrosion protection on metals in an acidic environment is building up greater significance as corrosion inhibitors. The isomers of poly(aminothiophenol) were synthesized by chemical oxidative polymerization method in aqueous HCl using ammonium persulfate as an oxidant. Electrochemical techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy, and weight loss method were used to investigate the anticorrosion activities of the isomers of poly(aminothiophenol) on mild steel in 1M HCl solution. The results revealed that the inhibition effectiveness increased with increasing inhibitor concentration, with the greatest inhibition efficiency recorded for all three polymers at the optimum concentration of 500 ppm. Polarization investigations revealed that these poly(aminothiophenol) isomers function as mixed type corrosion inhibitors.