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Investigation of Multilayer Brazed Aluminium Corrosion Process by Electrochemical Noise

机译:电化学噪声研究多层钎焊铝腐蚀工艺

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The corrosion process of a multilayer aluminum brazed sheet AA4045/AA3003*/AA4045 in EXCO solution was investigated by electrochemical noise (EN) technique. Cluster analysis and discrete wavelet transform analysis were performed to investigate EN data. Results showed that the corrosion process can be identified by cluster analysis and the energy distribution plot (EDP) extracted from EN data. As immersion time increased, the corrosion process of the multilayer brazed sheet changed from pitting corrosion (PC) to inter-granular corrosion (IGC) to exfoliation corrosion (EC), and then back to IGC. The maximum relative energy in EDP changed from small scale to middle scale to large scale and then back to middle scale. This finding shows a good agreement with the cluster analysis result. By coupled with the EN technique and corrosion morphology, EDP and cluster analysis can be used to study the corrosion process of multilayer brazed sheet.
机译:采用电化学噪声(EN)技术研究了多层铝钎焊板AA4045 / AA3003 * / AA4045在EXCO溶液中的腐蚀过程。进行聚类分析和离散小波变换分析以研究EN数据。结果表明,可以通过聚类分析和从EN数据中提取能量分布图(EDP)来识别腐蚀过程。随着浸入时间的增加,多层钎焊板的腐蚀过程从点蚀(PC)转变为晶间腐蚀(IGC)再到剥落腐蚀(EC),然后又转变为IGC。 EDP​​中的最大相对能量从小规模到中等规模再到大规模,然后又回到中等规模。这一发现与聚类分析结果显示出很好的一致性。结合EN技术和腐蚀形态,EDP和聚类分析可用于研究多层钎焊板的腐蚀过程。

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