钝性纳米金属材料的电化学腐蚀行为研究:钝化膜生长和局部点蚀行为<sup>*</sup>

doi:10.3724/SP.J.1037.2013.00617

金属学报

2014, Vol. 50

Issue (2): 212-218 DOI: 10.3724/SP.J.1037.2013.00617

本期目录 | 过刊浏览

钝性纳米金属材料的电化学腐蚀行为研究:钝化膜生长和局部点蚀行为^*

刘莉(

), 李瑛, 王福会

中国科学院金属研究所金属腐蚀与防护国家重点实验室, 沈阳 110016

ELECTROCHEMICAL CORROSION BEHAVIOR OF NANOCRYSTALLIZED MATERIALS: GROWTH OF PASSIVE FILM AND LOCAL PITTING CORROSION

LIU Li(

), LI Ying, WANG Fuhui

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

刘莉, 李瑛, 王福会. 钝性纳米金属材料的电化学腐蚀行为研究:钝化膜生长和局部点蚀行为^*[J]. 金属学报, 2014, 50(2): 212-218.
Li LIU, Ying LI, Fuhui WANG. ELECTROCHEMICAL CORROSION BEHAVIOR OF NANOCRYSTALLIZED MATERIALS: GROWTH OF PASSIVE FILM AND LOCAL PITTING CORROSION[J]. Acta Metall Sin, 2014, 50(2): 212-218.

全文: PDF(702 KB) HTML

摘要:

与同成分的传统粗晶材料相比, 纳米晶材料的腐蚀电化学行为发生显著改变. 纳米化会影响材料表面形成钝化膜的各种性能, 但关于纳米化如何影响决定其腐蚀行为的钝化膜生长机制以及点蚀行为目前尚不明确. 本文综述了近期针对纳米晶材料在含Cl^-的常温水溶液中的钝化膜生长及点蚀行为2个动态历程的研究结果, 发现纳米化通过促进钝化膜的形核过程并提高钝化膜的生长速度, 从而改善了钝化膜的致密性. 纳米化改变了点蚀的萌生位置, 抑制了稳态点蚀的形成和生长过程, 从而提高材料抗局部腐蚀的能力.

关键词 ：纳米晶金属材料, 钝化, 点蚀, 原位AFM观测, 电化学腐蚀

Abstract：

Compared with the traditional coarse-grained materials, the electrochemical corrosion behavior of nanocrystalline materials has changed obviously. Nanocrystallization influences the properties of passive film on passive materials. In this paper, the current understanding of the growth of passive film and local pitting corrosion on nanocrystalline materials by dynamic research techniques were reviewed. The results indicate that nanocrystallization changed the nucleation mechanism of the passive film from progressive to instantaneous, and which promotes the growth rate of the passive film, both of which promote the compact properties of the passive film. The effects of nanocrystallization on local pitting corrosion behavior are concluded: (1) more frequent occurrence of metastable pits, but with lower probability of transition to stable pits, which is attributable to differences in morphologies of sulfur and manganese as well as outstanding repassivation ability of nanocrystalline thin film; (2) nanocrystallization decreases stable pit generation rate and its propensity to form larger pit cavities, and modifies the morphology of stable pit cavity.

Key words： nanocrystalline material passivation pitting in-situ AFM observation electrochemical corrosion

收稿日期: 2013-09-27

ZTFLH:

TG172.5

基金资助:* 国家自然科学基金资助项目50801063和51271187

作者简介: null

刘莉, 女, 1979年生, 研究员, 博士

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00617 或 https://www.ams.org.cn/CN/Y2014/V50/I2/212

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