期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 8, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac83f5
关键词
layered double hydroxide; conversion coating; intermetallic; corrosion
资金
- SURF group at Vrije Universiteit Brussel
- I2B fond
- Portuguese Foundation for Science and Technology [IF/01284/2015]
- Portuguese Foundation for Science and Technology/MCTES [UIDB/50011/2020, UIDP/50011/2020]
- FCT/MEC (PIDDAC) [LA/P/0006/2020]
- VLAIO [HBC.2017.0300]
Direct growth of ZnAl layered double hydroxide on AA2024 is a fast reaction with an inhomogeneous film thickness. The flakes are larger and denser at the periphery of Cu-rich intermetallic. Trenching process during dealloying leads to defects and may weaken the performance of the layered double hydroxide conversion coating.
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 intermetallic phases 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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