Influence of stoichiometry on the corrosion response of titanium oxide coatings produced by plasma electrolytic oxidation

被引：10
|
作者：
Casanova, L. [1 ]
Arosio, Mattia [1 ]
Hashemi, Mohammad Taghi [2 ]
Pedeferri, M. [1 ]
Botton, G. A. [2 ]
Ormellese, M. [1 ]
机构：
[1] Politecn Milan, Dept Chem, Mat & Chem Engn G Natta, Via Mancinelli 7, I-20131 Milan, Italy
[2] Engn McMaster Univ, Dept Mat Sci, 1280 Main St West, Hamilton, ON L8S 4L7, Canada
来源：
CORROSION SCIENCE | 2022年 / 203卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Titanium; EIS; TEM; Acid corrosion; Anodic films; Hydrogen absorption; SULFURIC-ACID; HYDROGEN EMBRITTLEMENT; PROTONIC CONDUCTIVITY; FILMS; BEHAVIOR; MORPHOLOGY; STABILITY; KINETICS; STATE; WATER;
D O I：
10.1016/j.corsci.2022.110361
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study the corrosion mechanism leading to coating debonding in acidic environments, produced by plasma electrolytic oxidation (PEO) on Ti, is investigated through electrochemical impedance spectroscopy (EIS), potential step chronometric, and a detailed structural characterization according to the use of electron energy loss spectroscopy (EELS). It will be demonstrated that a slightly reduced oxide will enhance proton adsorption and percolation leading to oxide debonding, while the synthesis of a barrier layer mainly composed by Ti 4 + oxide bearing phases and low sulfur content will retard H + permeation enhancing H2 evolution in correspondence of the oxide surface.
引用
收藏
页数：13
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