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ÎÄÏ×£ºThe aspolished samples showed a dramatic decrease of the impedance in the capacitive region, which is characteristic for the pitting process on steel. The polarization resistance of as-polished sample (Rp0) is 2.8 ¦¸. Subtracting this value from the Rp of Ni¨CP (RpNi¨CP−Rp0) results in 1.2 ¦¸. Increasing magnitude of the resistance of the barrier layer indicates better corrosion performance. In addition, the phase angle ¦È tended toward zero at low frequencies indicating that the resistance of the barrier layer was being approached. An additional maximum of ¦È was observed for Ni¨CP coated samples, as evident in Fig. 1B. These changes of the spectra at very low frequencies indicate the occurrence of pitting.
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