The nanostructure and microstructure of steels: Electrochemical Tafel behaviour and atomic force microscopy

被引：11

作者：

Alves, VA

Paquim, AMC

Cavaleiro, A

Brett, CMA ^{[1
]}

机构：

[1] Univ Coimbra, Dept Quim, P-3004535 Coimbra, Portugal

[2] FAFEID, Fac Fed Integradas Diamantina, Dept FarmBioquim, BR-39100000 Diamantina, MG, Brazil

[3] Univ Coimbra, Dept Engn Mecan, P-3030 Coimbra, Portugal

来源：

CORROSION SCIENCE | 2005年 / 47卷 / 12期

关键词：

carbon steel; chromium steel; high speed steel; carbides; Tafel plots; atomic force microscopy;

D O I：

10.1016/j.corsci.2005.05.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of chemical composition and heat treatment on a low-carbon steel, chromium steel and high speed steel has been examined by polarisation curves and electrochemical parameters deduced from the Tafel plots. The electrochemical corrosion resistance, which is small between the as-received steels become greater after heat treatment, following the order: carbon steel < chromium steel similar to high speed steel. To explain these differences, the nano- and microstructure of the steels has been characterized by the ex situ techniques of atomic force microscopy and optical microscopy, before and after surface etching with Nital (a solution of 5% HNO3 in ethanol). This causes preferential attack of the ferrite phases showing the carbide phases more clearly. From these nanostructural studies it was possible to better understand why the passive films formed on chromium steel and high speed steel have superior protective properties to those formed on carbon steel. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2871 / 2882

页数：12

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