MECHANISM OF THE CATHODIC PROTECTIONBY SQUARE WAVE PULSED CURRENTSⅠ:Characteristics of the Cathodic Potential Waveforms

J Chin Soc Corr Pro

2002, Vol. 22

Issue (5): 295-299 DOI:

Research Report

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MECHANISM OF THE CATHODIC PROTECTIONBY SQUARE WAVE PULSED CURRENTSⅠ:Characteristics of the Cathodic Potential Waveforms

Yubing Qiu;Zhihu Guo;Hantong Lin

华中科技大学

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Yubing Qiu; Zhihu Guo; Hantong Lin. MECHANISM OF THE CATHODIC PROTECTIONBY SQUARE WAVE PULSED CURRENTSⅠ:Characteristics of the Cathodic Potential Waveforms. J Chin Soc Corr Pro, 2002, 22(5): 295-299 .

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Abstract The characteristics of the cathodic potential wavef orms of the Q235 steel electrodes polarized by square wave pulsed currents (SWPC s) were studied in 3%NaCl,0.06%NaCl and tap water.The results show that polarize d by SWPCs the cathodic potential waveforms have the basic features of those in RC parallel circuits,and move negatively with increase of the polarizing time bu t their shapes do not change obviously.The solution resistance may create great influence on the measured potential waveforms so that it must be compensated to obtain the real ones.The real amplitudes of the potential waveforms are very sma ll (<10 mV) and decrease with increasing frequencies of SWPCs.So it was pointed out that the bottommost potential of the cathodic potential waveform could be us ed as the cathodic polarization potential of the electrode.The characteristics o f the cathodic potential waveforms were analyzed in the paper.

Key words: square wave pulsed current potential waveform wavef orm characteristics cathodic protection mechanis

Received: 19 May 2001

ZTFLH:

TG174.41

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