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

doi:10.3724/SP.J.1037.2009.00648

Acta Metall Sin

2010, Vol. 46

Issue (3): 358-365 DOI: 10.3724/SP.J.1037.2009.00648

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

LIN Cui^1;2); ZHAO Qing^1;2); LIU Yue'e¹⁾; LIANG Jianneng¹⁾

1) National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology; Nanchang Hangkong University; Nanchang 330063
2) School of Material Science and Technology; Nanchang Hangkong University; Nanchang 330063

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LIN Cui ZHAO Qing LIU Yue'e LIANG Jianneng. EVOLUTION OF CORROSION PRODUCTS OF 20 CARBON STEEL IN ATMOSPHERE CONTAINING SO₂. Acta Metall Sin, 2010, 46(3): 358-365.

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Abstract

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, O₂ and H₂O continuously penetrated into the ruptured ferrous hydroxide film and sulphate nests formed. Inside the nests FeSO₄ reacted with O₂ 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.

Key words: 20 carbon steel SO₂ atmospheric corrosion growth characteristics

Received: 25 September 2009

Fund:

Supported by National Natural Science Foundation of China (No.50601012) and Higher School Key Laboratory Research Project of Jiangxi Province (No.GJJ08520})

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00648 OR https://www.ams.org.cn/EN/Y2010/V46/I3/358

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