An ESEM in situ investigation of initial stages of the KCl induced high temperature corrosion of a Fe-2.25Cr-1Mo steel at 400 °C

被引：67

作者：

Jonsson, T. ^{[1
]}

Folkeson, N. ^{[1
]}

Svensson, J. -E. ^{[1
]}

Johansson, L. -G. ^{[1
]}

Halvarsson, M. ^{[2
]}

机构：

[1] Chalmers Univ Technol, Dept Chem & Biol Engn, High Temp Corros Ctr, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

来源：

CORROSION SCIENCE | 2011年 / 53卷 / 06期

关键词：

Low alloy steel; SEM; XRD; High temperature corrosion; Chlorination; ALLOY SANICRO 28; IRON OXIDATION; FE; DIFFUSION; CHROMIUM; BIOMASS; NICKEL; TRACES;

D O I：

10.1016/j.corsci.2011.03.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The initial oxidation of a low-alloyed steel (Fe-2.25Cr-1Mo) in the presence of small amounts of KCl(s) have been investigated through ESEM in situ exposure and analysis at 400 degrees C. The samples were also characterized by XRD, SEM/EDX and FIB. The present study shows the corrosive nature of KCl towards the low alloyed steel. It is concluded that the initial KCl distribution is important and that a KCl/FeCl2 liquid phase film forms on large parts of the oxide surface in the presence of KCl. It is proposed that Cl increases the oxidation rate (by decorating oxide grain boundaries) and decreases the oxide scale adhesion. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2233 / 2246

页数：14

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