[极化电位差] polarization potential difference 又称“电极电位差”。是指两测量电极之间的电极电位差。当金属电极与土壤中水溶液接触时，很快自动形成电极电位，两电极的电极电位差习称极化电位差。在直流电法中，它是一种干扰，必须在测量之前设法消除。
铁丝的腐蚀不均匀，自腐蚀电位和极化电阻分布较分散，随时间增加、自腐蚀电位负移、极化电阻变小、丝束之间的电位差增大。
With the increase of immersion time, the corrosion potential shifted negatively, the polarization resistance reduced and the difference of corrosion potential became larger.
时间城激电对电位差的相对精度要求不高，但供电电流大，装备笨重。变频法对电位差的相对精度提出了很高的要求，在极化率低时，难于达到。
The time domain IP does not require very high relative precision of potential difference, but the supply current is large and the equipment is cumbersome.
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