采用电化学噪声（EN）技术研究了X70管线钢在库尔勒原土（含水量1.04%）中腐蚀初期（0 d~7 d）的腐蚀行为。通过时域谱分析、统计量分析和Q型聚类分析研究了电化学噪声特征以及相应的腐蚀状态信息，并与实际腐蚀状态和电化学阻抗谱（EIS）结果进行了对比。结果表明，基于EN统计量的谱系聚类分析法可用于解析土壤EN数据。聚类分析结果与时域分析、腐蚀形貌特征和EIS结果相吻合，且更加精确。根据聚类分析结果，可将研究体系中初期土壤局部腐蚀过程分为不稳定萌发期、快速发展期和稳定发展期三个阶段。
The corrosion behaviors of X70 steels in Xinjiang Ku'erle saline soil (moisture content 1.04%) during the initial corrosion period (0~7 days) were studied by electrochemical noise (EN). The characteristics of the EN time records and their related corrosion information were identified by analysis of the EN fluctuations, statistical parameters including standard deviation of potential and current (σE, σ I) and noise resistance (Rn), as well as Q-type clustering, which was further proved by corrosion morphology and electrochemical impedance spectroscopy (EIS) results. The results show that cluster analysis could be used to treat the EN signals to identify different corrosion states. Based on the hierarchical agglomerative cluster using σE and σ I as variables, three different states for the local corrosion in the studied system could be classified clearly, including instable germination state, quick development state and stable development state.
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