模拟混凝土孔溶液中钢筋电化学噪音测量及小波分析  

Measurement and Wavelet Analysis of the Electrochemical Noise of Rebar Steel in Simulated Concrete Pore Solution

作　　者：胡融刚[1] 叶陈清[1] 董士刚[1] 林昌健[1] 

机构地区：[1]厦门大学化学化工学院,固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《电化学》2010年第2期137-144,共8页Journal of Electrochemistry

基　　金：国家自然科学基金;国家科技支撑计划项目(50731004;2007BAB27B04)资助

摘　　要：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） measurement can provide information about both corrosion rate and corrosion type while inflicting no perturbation on the studied system. The ECN data of steel rebar in SPS with different amount of Cl-were collected and treated by discrete wavelet transformation to evaluate the contribution from transients in different frequency in the overall signals. Energy distribution plot（ EDP） indicated in SPS with 0. 0001 mol/L NaCl,the transients with time constant between 16 ～ 32 s were found to be predominant over other processes; while in SPS with higher Cl-concentration,the trend toward active corrosion became the main process. It is concluded that the threshold Cl-concentration determining corrosion/passivation of steel rebar in SPS is between 10-4 ～ 10-3 mol/L.

关 键 词：电化学噪音 小波分析 钢筋 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]