Abstract The impedance characteristic and degradation process of two epoxy coatings in 3.5 % NaCl solution and seawater environment were studied by using electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) and infrared spectroscopy (FTIR) methods. Pearson’s correlation coefficient (r) method was used to analyze the correlation between the phase angles in different frequencies and the impedance at low frequency end (|Z|0.01 Hz) for epoxy coatings. The results show that in a middle frequency range (about 1–100 Hz) the phase angles have a strong positive correlation with |Z|0.01 Hz (r > 0.90–0.95). Based on the good linear relationship (log (|Z|0.01 Hz) = A + B × θ) between the phase angle in middle frequency range and the |Z|0.01 Hz values, it is suggested that the phase angle at 10 Hz (θ10Hz) is a suitable parameter to rapidly evaluate the degradation degree and the protective performance of the coatings.

中文翻译：

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基于Pearson相关系数的相位角变化与涂层性能的相关性研究

摘要 采用电化学阻抗谱（EIS）、扫描电子显微镜（SEM）和红外光谱（FTIR）等方法研究了两种环氧涂层在3.5% NaCl溶液和海水环境中的阻抗特性和降解过程。采用皮尔逊相关系数(r)法分析环氧树脂涂层不同频率相位角与低频端阻抗(|Z|0.01 Hz)的相关性。结果表明，在中频范围内（约 1–100 Hz），相角与 |Z|0.01 Hz (r > 0.90–0.95) 具有很强的正相关性。基于中频范围内的相位角与 |Z|0.01 Hz 值之间良好的线性关系（log (|Z|0.01 Hz) = A + B × θ），