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电化学噪音(Electrochemical Noise,ECN)测量可用于在无电信号扰动条件下检测腐蚀体系的暂态行为,获得有关腐蚀类型和腐蚀速率的信息.小波分析不需要对ECN作稳态假设,并同时具有时间分辨和频率分辨的特点,在ECN信号处理中表现出一定的优势.本工作考察了氯离子对钢筋在模拟混凝土孔溶液中电化学噪音的影响,并采用离散小波变换(DWT)及能量分布图(EDP)分析ECN信号的时间～频率特征.结果表明,在含NaCl0.0001mol/L的饱和Ca(OH)2溶液中,时间常数为16～32s的暂态占优势;在Cl-浓度更高的溶液中,去钝化趋势为主导事件,表明钢筋在SPS溶液中活化/钝化的临界Cl-浓度介于10-4～10-3mol/L.
Electrochemical Noise (ECN) measurements can be used to detect transient behavior of corrosion systems in the absence of electrical signal perturbations to obtain information about the type of corrosion and corrosion rate Wavelet analysis does not require steady-state assumptions about ECN and at the same time Time-resolved and frequency-resolved, which shows some advantages in ECN signal processing.In this work, the effect of chloride ions on the electrochemical noise of steel reinforced concrete in simulated concrete pore solution was investigated and the effects of discrete wavelet transform (DWT) and energy (EDP) was used to analyze the time-frequency characteristics of ECN signals.The results showed that the transients with time constant of 16 ~ 32s were predominant in the saturated Ca (OH) 2 solution containing0.0001mol / L NaCl, Higher solution, depassivation trend as the leading event, indicating that the activation / passivation of the steel in the SPS solution, the critical Cl-concentration ranged from 10-4 to 10-3 mol / L.