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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 2
BKCSDE 15(2)
February 20, 1994 

Study of Corrosion of Brass Coated Steel Cords in the Acetonitrile Solution of Sulfenamide Derivatives by Tafel Plot and AC Impedance Measurements
Young Chun Ko, Byung Ho Park, Hae Jin Kim, Q Won Choi, Jongbaik Ree*, Keun Ho Chung*
Corrosion of brass coated steel cords in the acetonitrile solution of sulfenamide derivatives, N-Cyclohexylbenzothiazole-2-sulfenamide (CBTS), N,N'-Dicyclohexylbenzothiazole-2-sulfenamide (DCBS), N-tert-Butylbenzothiazole-2-sulfenamide (TBBS), N-tert-Amylbenzothiazole-2-sulfenamide (TABS), and N-Oxydiethylbenzothiazole-2-sulfenamide (OBTS) was investigated by potentiostatic anodic and cathodic polarization (Tafel plot), DC polarization resistance, and AC impedance measurements. The corrosion current densities and rates are 1.236 μA /cm2 and 0.655 MPY for CBTS; 1.881 μA/cm2 and 0.988 MPY for DCBS; 2.367 μ A/cm2 and 1.257 MPY for TBBS; 3.398 μA/cm2 and 1.809 MPY for TABS, respectively. OBTS among derivatives under study shows the lowest corrosion density (0.546 μA/cm2) and the slowest corrosion rate (0.288 MPY). Also, the charge transfer resistances and the double layer capacitances are 275.21 kΩ·cm2 and 7.0 μF·cm-2 for CBTS; 14.24 kΩ·cm2 and 26 μF·cm-2 for DCBS; 54.15 kΩ· cm2 and 16 μF·cm-2 for TBBS; 0.96kΩ·cm2 and 83 μF·cm-2 for TABS, respectively. The weaker the electron donating inductive effect of derivatives is and the smaller the effect of steric hindrance is, the more the corrosion of brass coated steel cords in the acetonitrile solution of sulfenamide derivatives is prevented. The above results agree with that observed in the field of tire industry.
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