Active protection of Mg alloy by composite PEO coating loaded with corrosion inhibitors

被引：108

作者：

Chen, Yan ^{[1
,2
]}

Lu, Xiaopeng ^{[1
]}

Lamaka, Sviatlana V. ^{[2
]}

Ju, Pengfei

Blawert, Carsten ^{[2
]}

Zhang, Tao ^{[1
]}

Wang, Fuhui ^{[1
]}

Zheludkevich, Mikhail L. ^{[2
,3
]}

机构：

[1] Northeastern Univ, Shenyang Natl Lab Mat Sci, 3-11 Wenhua Rd, Shenyang 110819, Liaoning, Peoples R China

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, MagIC Magnesium Innovat Ctr, Max Planck Str 1, D-21502 Geesthacht, Germany

[3] Univ Kiel, Fac Engn, Kaiserstr 2, D-24143 Kiel, Germany

来源：

APPLIED SURFACE SCIENCE | 2020年 / 504卷

基金：

欧盟地平线“2020”; 中国国家自然科学基金;

关键词：

Magnesium; Plasma electrolytic oxidation; Sol-gel coating; Corrosion inhibitors; Active corrosion protection; PLASMA ELECTROLYTIC OXIDATION; MAGNESIUM ALLOY; LOCALIZED CORROSION; SODIUM ALGINATE; RESISTANCE; AZ31; PHOSPHATE; DEPOSITION; MECHANISM; OXIDES;

D O I：

10.1016/j.apsusc.2019.144462

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：

A PEO (Plasma Electrolytic Oxidation) /Sol-gel composite coating was prepared on AZ91 magnesium alloy. The porous layer produced by PEO was loaded with corrosion inhibitors (sodium salts of glycolic, 4-aminosalicylic and 2,6-pyridinedicarboxylic acids). Sealed with a thin sol-gel layer, this sandwich-like structure demonstrated durable barrier and active corrosion protection as shown by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). The active protection mechanism ensures self-healing ability of the coating system, which was obtained by suppression of the re-deposition of impurity and/or adsorption of the impregnated inhibitors upon the exposed surface.

引用

页数：10

共 56 条

[1] Synergistic influence of inorganic oxides (ZrO2 and SiO2) with N2H4 to protect composite coatings obtained via plasma electrolyte oxidation on Mg alloy [J].