Correlation between pitting susceptibility and surface acidity, point of zero charge of passive film on aluminum: Influence of alloying elements

被引：7

作者：

Chen, Dihao ^{[1
,2
]}

Li, Menglin ^{[1
,3
]}

Yue, Xiaoqi ^{[2
]}

Ji, Yucheng ^{[1
]}

Xu, Yongtao ^{[4
]}

Pan, Jinshan ^{[2
]}

Dong, Chaofang ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing Adv Innovat Ctr Mat Genome Engn, Key Lab Corros & Protect,MOE, Beijing 100083, Peoples R China

[2] KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden

[3] State Grid Smart Grid Res Inst Co Ltd, State Key Lab Adv Power Transmiss Technol, Beijing 102211, Peoples R China

[4] Natl Engn & Technol Res Ctr Nonferrous Met Composi, Beijing 101407, Peoples R China

来源：

CORROSION SCIENCE | 2024年 / 227卷

基金：

中国国家自然科学基金;

关键词：

Passive film; Surface acidity; Point of zero charge; Pitting potential; First-principles calculations; DUPLEX STAINLESS-STEEL; ISOELECTRIC POINT; OXIDE-FILMS; AL-MO; CORROSION; ADSORPTION; BEHAVIOR; METALS; MOLECULES; GROWTH;

D O I：

10.1016/j.corsci.2023.111726

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The pitting potential, intrinsic surface acidity, point of zero charge of passive film on Al are studied using firstprinciples calculations to establish their relationships. Influences of alloying elements Zn, Cr, Nb, Si, Mo and Sc on adsorption of NH3 and NaCl, pHpzc of Al2O3 and pitting susceptibility of Al are investigated. The efficiency for enhancing pitting resistance of Al is evaluated, yielding the ratios Si: Zn: Cr: Mo: Nb: Sc = 1.8: - 0.3: 1: 1.9: 1.4: 0.2. A model for the dependence of pitting potential on the concentration of alloying elements in Al alloy matrix is developed, based on effects of alloying elements on the surface charge of passive film. The effects of Sc on pitting potential and pHpzc of Al oxide are predicted based on the calculated results, which are supported by electrochemical measurement, XPS analysis and contact angle titration.

引用

页数：12

共 78 条

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