In situ synergistic strategy of sacrificial intermedium for scalable-manufactured and controllable layered double hydroxide film

Zhu, Yaxian; Song, Guang‐Ling; Zheng, Dajiang; Serdechnova, Maria; Blawert, Carsten; Zheludkevich, Mikhail L.

doi:10.1007/s40843-021-1975-y

Cited by 8 publications

(1 citation statement)

References 41 publications

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“…With regards to the source of Zn, a recent study has shown that ZnO could be formed first at then gradually dissolved to liberate Zn 2+ /Zn(OH) + that would recombine with ( ) − Al OH 4 to form LDH. 64 The detection of ZnO was also suspected in a previous study focusing on the LDH growth outside the IMC regions. 36 Therefore, both oxide and hydroxide forms can be considered as relevant for the LDH growth.…”

Section: Discussionmentioning

confidence: 90%

The Role of Cu-Based Intermetallic on the Direct Growth of a ZnAl LDH Film on AA2024

Bouali

Serdechnova

Yasakau

et al. 2022

J. Electrochem. Soc.

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The direct ZnAl layered double hydroxide growth on AA2024 is a fast-occurring reaction, yet is characterized by an inhomogeneous film thickness. It has been shown that at the periphery of Cu-rich intermetallic, the flakes tend to be larger and denser. A combination of in situ and ex situ measurements were used to monitor the changes in the layered double hydroxide film grown on the regions of intermetallics. Immediately after immersion, an activation of the intermetallics is observed due to the dealloying process with an almost immediate film growth. Dealloying is followed by trenching of the adjacent Al matrix leading to an excessive production of large and dense layered double hydroxide flakes at the periphery of the intermetallic. However, the scanning electron microscopy cross-section images revealed that the trenching process leads to defects in the area surrounding the intermetallic. This could weaken the corrosion resistance performance of the layered double hydroxide conversion coating and lead to adhesion failure of consecutive polymer coatings. Nevertheless, this work highlights a few advantages and drawbacks of the layered double hydroxide conversion coatings and pathways to its potential optimization and improvement.

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Section: Discussionmentioning

confidence: 90%