TY - JOUR
T1 - Evaluation of the formation and protectiveness of a lithium-based conversion layer using electrochemical noise
AU - Li, Ziyu
AU - Homborg, Axel
AU - Gonzalez-Garcia, Yaiza
AU - Kosari, Ali
AU - Visser, Peter
AU - Mol, Arjan
PY - 2022
Y1 - 2022
N2 - The formation process of a lithium-based conversion layer on AA2024-T3 and its corrosion protective behavior are studied using electrochemical noise (EN). Wavelet transform, as well as noise resistance analysis, have been employed to interpret the EN data. The EN data confirmed five different stages during the conversion layer growth, accompanied by anodic dissolution, increasing corrosion protection of the conversion layer, and adsorption, growth and desorption of hydrogen bubbles simultaneously. The detachment of hydrogen bubbles, localized and uniform corrosion generate different features in the EN signals with energy maxima in high, intermediate and low frequency bands, respectively. In addition, EN results show that the lithium-based conversion layer still provides efficient protection after re-immersion in a corrosive environment, even though localized damage occurs. Moreover, the EN data corresponds well with the morphological layer formation and breakdown observed with microscopy techniques. The results demonstrate that EN is a powerful tool to provide continuous time- and frequency-resolved information about inhibition efficiency.
AB - The formation process of a lithium-based conversion layer on AA2024-T3 and its corrosion protective behavior are studied using electrochemical noise (EN). Wavelet transform, as well as noise resistance analysis, have been employed to interpret the EN data. The EN data confirmed five different stages during the conversion layer growth, accompanied by anodic dissolution, increasing corrosion protection of the conversion layer, and adsorption, growth and desorption of hydrogen bubbles simultaneously. The detachment of hydrogen bubbles, localized and uniform corrosion generate different features in the EN signals with energy maxima in high, intermediate and low frequency bands, respectively. In addition, EN results show that the lithium-based conversion layer still provides efficient protection after re-immersion in a corrosive environment, even though localized damage occurs. Moreover, the EN data corresponds well with the morphological layer formation and breakdown observed with microscopy techniques. The results demonstrate that EN is a powerful tool to provide continuous time- and frequency-resolved information about inhibition efficiency.
KW - Aluminium alloy
KW - Corrosion inhibition
KW - Electrochemical noise
KW - Hexavalent chromium replacement
KW - lithium-based conversion layer
UR - http://www.scopus.com/inward/record.url?scp=85133770178&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2022.140733
DO - 10.1016/j.electacta.2022.140733
M3 - Article
AN - SCOPUS:85133770178
VL - 426
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
M1 - 140733
ER -