EVOLUTION OF CORROSION PRODUCTS OF 20 CARBON STEEL IN ATMOSPHERE CONTAINING SO2

被引：0
|
作者：
Lin Cui [1 ,2 ]
Zhao Qing [1 ,2 ]
Liu Yue'e [1 ]
Liang Jianneng [1 ]
机构：
[1] Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China
[2] Nanchang Hangkong Univ, Sch Mat Sci & Technol, Nanchang 330063, Peoples R China
来源：
ACTA METALLURGICA SINICA | 2010年 / 46卷 / 03期
基金：
中国国家自然科学基金;
关键词：
20 carbon steel; SO2; atmospheric corrosion; growth characteristics; IN-SITU; MILD-STEEL; EXPOSURE; IRON;
D O I：
10.3724/SP.J.1037.2010.00358
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The evolution of corrosion products of 20 carbon steel in simulated humidity atmosphere containing SO2 was investigated by means of OM, SEM, XRD and localized electrochemical impedance spectrum (LEIS). Results showed ferrous hydroxide film firstly formed on the sample surface; the film ruptured in the acidic medium, and then filaments with green heads occurred. The filaments grew along the grain boundaries and into ferrite grain. Ferrite phase was dissolved when SO2, O-2 and H2O continuously penetrated into the ruptured ferrous hydroxide film and sulphate nests formed. Inside the nests FeSO4 reacted with O-2 and H2O to form FeOOH, finally the cellular corrosion products formed. The cellular corrosion products and its impedance increased, and the rust layer became even and compact with further corrosion. Cellular products grew faster with the increasing SO2 concentration.
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页码：358 / 365
页数：8
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