Improved electrochemical behavior of Mg-Li alloys by superhydrophobic layered double hydroxides/Ni-based composite coatings

被引：15
作者：
Li, Dayan [1 ]
Cui, Xiufang [1 ]
Wen, Xin [1 ]
Li, Yan [1 ]
Liu, Erbao [1 ]
Jin, Guo [1 ]
Zheng, Wei [1 ]
机构：
[1] Harbin Engn Univ, Inst Surface Interface Sci & Technol, Key Lab Superlight Mat & Surface Technol, Coll Mat Sci & Chem Engn,Minist Educ, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 947卷
基金：
中国国家自然科学基金;
关键词：
Mg-Li alloy; NiP coating; MgAl LDHs; Superhydrophobicity; Corrosion resistance; CORROSION-RESISTANCE; MAGNESIUM ALLOY; LDH FILMS; SURFACE; ACID; FABRICATION; PROTECTION;
D O I：
10.1016/j.jallcom.2023.169666
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
As a lightweight material, the wide application of Mg-Li alloy is restricted by its corrosion resistance. Focusing on this, an innovative superhydrophobic composite coatings of nickel-based metal coupled with layered double hydroxides (LDHs) was prepared on Mg-Li alloy. The microstructure, hydrophobic property and corrosion resistance of coatings were investigated by SEM, TEM, XRD, FT-IR, AFM, contact angle tester and electrochemical test. The results indicated that the MgAl LDHs uniformly grown in situ on the NiP coating deposited on Mg-Li alloy through electroless plating and hydrothermal treatment. The MgAl LDHs with a complex honeycomb micro-nano structure improved the surface roughness of the composite coating to 126 nm. The two-step treatment achieved an excellent coupling between the metal-based coating and inorganic compounds. The low surface energy treatment of micro-nano structure on NiP coating surface with stearic acid (@SA) realized the superhydrophobic transition of the composite coating (WAC=154.27 degrees +/- 2.56 degrees). Besides, MgAl LDHs showed better trapping properties for Cl-. Under the sy-nergistic effect of anion capture and hydrophobic effect, the corrosion current density (1.35 x10-7 A.cm-2) and impedance modulus of NiP/MgAl LDHs@SA coating were significantly better than those of NiP and NiP/ MgAl LDHs coating. The superhydrophobic composite coating provided a better anticorrosion choice for Mg-Li alloy. (c) 2023 Elsevier B.V. All rights reserved.
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页数：13
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