Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process

doi:10.11902/1005.4537.2017.215

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 43-50 DOI: 10.11902/1005.4537.2017.215

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Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process

Changgang WANG¹,Jie WEI¹,Xin WEI¹,Xin MU¹,Fang XUE¹,Junhua DONG¹(

),Wei KE¹,Guoping LI²

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Technology Center of Taiyuan Iron and Steel Group Co. Ltd., Taiyuan 030003, China

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Abstract

The crevice corrosion of 316, 904L, 254sMo and 2507 stainless steels in a liquid of the so called green death at 70 ℃, which aims to simulate the corrosive environment of flue gas desulfurization process, was comparatively investigated by means of electrochemical cyclic polarization test and SEM. The results showed that 254sMo and 2507 stainless steel have excellent resistance to crevice corrosion, while the crevice corrosion induced damage of SS316 and SS904L is serious. The "lace cover" structures were observed on the edges of the gap of SS316 and SS904L, but not on that of SS254sMo and SS2507. At the bottom of crevice corrosion pit, duplex super stainless steel 2507 exhibits galvanic corrosion characteristics.

Key words: super stainless steel flue gas desulfurization death green solution artificial crevice electrode crevice corrosion

Received: 25 December 2017

ZTFLH:

TG174

Fund: Supported by National Natural Science Foundation of China(51071160);National High Technology Research and Development Plan(2015AA034301)

Corresponding Authors: Junhua DONG E-mail: jhdong@imr.ac.cn

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	Changgang WANG
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	Wei KE
	Guoping LI

Cite this article:

Changgang WANG,Jie WEI,Xin WEI,Xin MU,Fang XUE,Junhua DONG,Wei KE,Guoping LI. Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 43-50.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.215 OR https://www.jcscp.org/EN/Y2019/V39/I1/43

Table 1 Elemental compositions and PREN values of four tested stainless steels (mass fraction / %)

Fig.1 Schematic diagram of the artificial gap electrode: (a) polyethylene bite unit, (b) stainless steel elect-rode plate, (c) physical photograph

Fig.2 Cyclic voltammetric curves of artificial gap electrodes of 316 (a), 904L (b), 254sMo (c) and 2507 (d) stainless steels in death green liquid at 70 ℃

Fig.3 Statistics of crevice corrosion of four stainless steels

Fig.4 Statistical counts of crevice corrosion depth of four stainless steels

Fig.5 Corrosion morphology of 316 stainless steel artificial gap electrode after cyclic voltammetry in death green liquid at 70 ℃ (a) and the magnified images of the areas I (b), II (c) in Fig.5a, III (d) and IV (e) in Fig.5b

Fig.6 Corrosion morphology of 904L stainless steel artificial gap electrode after cyclic voltammetry in death green liquid at 70 ℃ (a) and the magnified images of the areas I (b), II (c), III (d) in Fig.6a, IV in Fig.6b (e) and V in Fig.6c (f)

Fig.7 Corrosion morphology of 254sMo stainless steel artificial gap electrode after cyclic voltammetry in death green liquid at 70 ℃ (a) and the magnified images of the areas I (b), II (c) in Fig.7a, III (d) and IV (e) in Fig.7b

Fig.8 Corrosion morphology of 2507 stainless steel artificial gap electrode after cyclic voltammetry in death green liquid at 70 ℃ (a) and the magnified images of the areas I (b), II (c) in Fig.8a, III (d) and IV (e) in Fig.8b

Fig.9 Schematic diagram of IR reduction mechanism for crevice corrosion of stainless steels^[14,15]

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