Influence of Ammonia Desulfurization Liquid Components on Localized Corrosion Development Stage of 304 Stainless Steel

doi:10.11902/1005.4537.2022.335

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1392-1398 DOI: 10.11902/1005.4537.2022.335

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Influence of Ammonia Desulfurization Liquid Components on Localized Corrosion Development Stage of 304 Stainless Steel

REN Wankai, LIAN Zhouyang(

), ZHOU Kang, LUO Zhengwei, WEI Wuji, ZHANG Xueying

School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China

Cite this article:

REN Wankai, LIAN Zhouyang, ZHOU Kang, LUO Zhengwei, WEI Wuji, ZHANG Xueying. Influence of Ammonia Desulfurization Liquid Components on Localized Corrosion Development Stage of 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1392-1398.

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Abstract

The influence of main components of ammonia desulfurization slurry on the development stage of localized corrosion for 304 stainless steel was studied by means of constant voltage occlusion battery and long-term static pitting corrosion test aiming to simulate the real local corrosion, as well as XPS and UV-VIS spectroscopy to characterize corrosion products and solutions. The results showed that low concentration (NH₄)₂SO₄ in ammonia desulfurization slurry can promote the effect on localized corrosion development of 304 stainless steel, while high concentration can inhibit it. With the increase of Cl^- concentration, the localized corrosion was intensified. The complex compounds on the surface resulted from the interaction of F^- and metal ions, while the competitive migration effect with Cl^- made the presence of F^- have a certain inhibitory effect on the localized corrosion of stainless steel.

Key words: ammonia desulfurization 304 stainless steel localized corrosion analog occlusion battery simulate static pitting corrosion

Received: 28 October 2022 32134.14.1005.4537.2022.335

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(21676144)

Corresponding Authors: LIAN Zhouyang, E-mail: lianzy@njtech.edu.cn

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	REN Wankai
	LIAN Zhouyang
	ZHOU Kang
	LUO Zhengwei
	WEI Wuji
	ZHANG Xueying

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.335 OR https://www.jcscp.org/EN/Y2023/V43/I6/1392

Fig.1 Schematic diagram of a local corrosion simulation occlusion battery

Fig.2 Schematic diagrams of 304 stainless steel specimen and static simulation pitting test device

Fig.3 Changes in system power consumption (a) and corrosion amount of internal electrode (b) at different mass fractions of ammonium sulfate

Fig.4 Changes of pitting corrosion amount of 304 stainless steel at different mass fractions of ammonium sulfate

Fig.5 Changes in system power consumption (a), internal electrode corrosion amount (b), dissolved oxygen in occlusion zone(c) and pH (d) at different Cl^- concentrations

Fig.6 Changes in the pitting corrosion amount of 304 stainless steel at different Cl^- concentrations

Fig.7 Changes in system power consumption (a), corrosion amount of internal electrode (b) and pH in occlusion area (c) at different F^- concentrations

Table 1 Comparison of data at different initial F^- concentrations

Fig.8 Changes in the pitting corrosion amount of 304 stainless steel at different F^- concentrations

Fig.9 XPS spectra of internal corrosion products of occlusion battery: (a) survey, (b) Fe 2p, (c) Cr 2p

Fig.10 UV-VIS absorption spectra of internal solution after occlusion closed cell test: (a) 0.1 mol/L Cl^- with different F^- concentration, (b) different Cl^- and F^- concentration

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