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发表时间：2022-10-09

发表刊物：腐蚀与防护

卷号：35

期号：01

页面范围：1-4

ISSN号：1005-748X

摘要：The corrosion behavior of Al-based hydrotalcite coatings in 3. 5 % NaCl solution was characterized by electrochemical noise analysis technique. The corrosion process of electrodes was studied in detail by analyzing time-domain and frequency-domain characteristics of electrochemical noise (EN) together with morphology features. The results showed that the pitting corrosion process of coatings could be divided into four different stages. At passivated stage, the EN fluctuated slightly, and the parameters were relatively stable. At metastable pitting nucleation stage, the EN began to fluctuate obviously, ��<inf>V</inf>, ��<inf>I</inf>, W and f<inf>c</inf> increased, R<inf>n</inf> decreased. At stable pitting corrosion stage, the potential declined rapidly and rised slowly, meanwhile various parameters tended to extremum and Li (localization index) was close to 1. At later pitting corrosion stage, the EN fluctuated slightly and various parameters tended to be weakened.

备注：新增回溯数据