Abstract This research presents the study of the corrosion type and the corrosion rate (CR) by signal processing of electrochemical noise (EN) of the Aluminum 6061-T6 (Al 6061-T6). This was exposed to bioethanol obtained from sugarcane (E100), regular gasoline (E0) and bioethanol - gasoline blends in following proportions; E5 (5% v/v bioethanol), E10 (10% v/v bioethanol), E20 or gasohol (20% v/v bioethanol) and E85 (85% v/v bioethanol). Three mathematical tools were used to perform the corrosion analysis: statistical method (SM), Fast Fourier transform (FFT), and Stockwell transform (ST) methods. The aims is show the effectiveness of the ST method to define the corrosion type, resistance, as well as the CR. From the obtained results, the Al 6061-T6 in E100 and E85 blends showed greater susceptibility to the localized corrosion, and in E0, E5, E10 and E20 blends were susceptible to mixed corrosion were susceptible to mixed corrosion.Similar values of resistance and CR were obtained by the analyzed methods. The Al 6061-T6 immersed in the bioethanol-gasoline blends achieved resistance values between 1 × 105 Ω cm2 and 1 × 1010 Ω cm2. The corrosion current density values (icorr) for all working electrodes were less than 2.1 × 10−4 mA/cm2, these values are considered low and insignificant. The ST is a powerful tool capable of analyzing the electrochemical behavior of aluminum alloy exposed to different solutions of bioethanol-gasoline blends. This mathematical model turned out to be efficient in determining the corrosion resistance, corrosion type, and kinetics of the process. Its application could be extended to the study of the corrosion of other metals in contact with other biofuels.

中文翻译：

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使用 Stockwell 变换对暴露在甘蔗生物乙醇-汽油混合物中的铝 6061-T6 进行腐蚀评估。

摘要 本研究通过对铝 6061-T6 (Al 6061-T6) 的电化学噪声 (EN) 进行信号处理，对腐蚀类型和腐蚀速率 (CR) 进行了研究。将其暴露于从甘蔗 (E100)、普通汽油 (E0) 和生物乙醇 - 按以下比例混合的汽油中获得的生物乙醇；E5（5% v/v 生物乙醇）、E10（10% v/v 生物乙醇）、E20 或汽油醇（20% v/v 生物乙醇）和 E85（85% v/v 生物乙醇）。使用三种数学工具进行腐蚀分析：统计方法 (SM)、快速傅立叶变换 (FFT) 和斯托克韦尔变换 (ST) 方法。目的是展示 ST 方法在定义腐蚀类型、电阻以及 CR 方面的有效性。从获得的结果来看，E100 和 E85 混合物中的 Al 6061-T6 对局部腐蚀表现出更大的敏感性，而在 E0、E5、E10和E20共混物易受混合腐蚀易受混合腐蚀。通过分析方法获得了相似的电阻和CR值。浸入生物乙醇-汽油混合物中的 Al 6061-T6 的电阻值介于 1 × 105 Ω cm2 和 1 × 1010 Ω cm2 之间。所有工作电极的腐蚀电流密度值 (icorr) 均小于 2.1 × 10-4 mA/cm2，这些值被认为是低且无关紧要的。ST 是一种强大的工具，能够分析铝合金在不同的生物乙醇-汽油混合物溶液中的电化学行为。事实证明，该数学模型在确定过程的耐腐蚀性、腐蚀类型和动力学方面是有效的。它的应用可以扩展到研究与其他生物燃料接触的其他金属的腐蚀。