Abstract
Li-LDH sealing is accounted for being highly competitive to standard hot-water sealing as referred to reduced treatment temperature and higher corrosion protection efficiency.
Highlights
The escalating fabrication demands for “green” aircra s following the latest European guidelines have set new challenges in the selection of materials and processes in the aeronautic industry
Zn–Al-layered double hydroxide (LDH) sealing was successfully achieved on tartaric–sulfuric acid (TSA)-AA2024 at 95 C under an optimized pH conditions.[13]
The Electrochemical impedance spectroscopy (EIS) measurements, for long immersion time up to 1 month, in Fig. 6 show that the VOx species have a positive effect on the barrier properties of the TSA layer, both resistances of the inner and porous layers illustrated in Fig. 1 are higher than those for LDH-OH/CO3
Summary
The escalating fabrication demands for “green” aircra s following the latest European guidelines have set new challenges in the selection of materials and processes in the aeronautic industry. 13) and PEO coated substrates.[14] In these works a multi-level protection was explored with LDH working as (1) physical barriers to seal the pores (passive protection) and “smart” ion-exchanger providing synergistic active corrosion protection The latter is achieved via (2) on demand controlled release of corrosion inhibitors, together with (3) absorption/entrapping of corrosive ions (e.g. ClÀ, SO42À, OHÀ). The demonstrated results suggest that Li–Al LDH can be formed at relatively low temperature in a short time when Li cations are present in the solution This fact has triggered the idea that Li-based LDH can be a better alternative for sealing porous anodic layers in comparison to Zn–Al counterpart. Data sheds light on the corrosion protection of TSA treated AA2024 achieved through a cost-effective new environmentally friendly sealing process that can be run at room temperature and it is highly competitive with other current reference solutions, such as hot water sealing, here studied for comparative purposes
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