Zn-Al layered double hydroxides as chloride nanotraps in active protective coatings

被引：238
|
作者：
Tedim, J. [1 ]
Kuznetsova, A. [1 ]
Salak, A. N. [1 ]
Montemor, F. [2 ]
Snihirova, D. [2 ]
Pilz, M. [3 ]
Zheludkevich, M. L. [1 ]
Ferreira, M. G. S. [1 ]
机构：
[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal
[2] Inst Super Tecn, ICEMS, P-1049001 Lisbon, Portugal
[3] SINTEF Mat & Chem, N-0373 Oslo, Norway
来源：
CORROSION SCIENCE | 2012年 / 55卷
关键词：
Organic coatings; X-ray diffraction; HYDROTALCITE-LIKE COMPOUNDS; CORROSION PROTECTION; FILIFORM CORROSION; COATED AA2024-T3; ALUMINUM-ALLOY; INHIBITOR; PIGMENTS; NANOCONTAINERS; RELEASE; ANIONS;
D O I：
10.1016/j.corsci.2011.10.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Zn-Al layered double hydroxides (LDHs) intercalated with nitrate anions are suggested as chloride nanotraps for organic polymeric coatings. The addition of such nanotraps to a polymer layer drastically reduces the permeability of corrosive chloride anions through the protective coatings. In solution, Zn(2)-Al-NO3 LDHs are responsive to the concentration of chlorides and the release of nitrates is accompanied by entrapment of chlorides, with the process governed by ion-exchange equilibrium. In particular, a coating modified with LDH-NO3 was found to exhibit significantly lower permeability to chlorides when compared to both unmodified and LDH-Cl-containing coatings, which proves the applicability of LDHs in delaying coating degradation and corrosion initiation. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：1 / 4
页数：4
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