Corrosion Behavior of Ferritic Stainless Steel in High Temperature Urea Environment

doi:10.11901/1005.3093.2020.065

Chinese Journal of Materials Research

2020, Vol. 34

Issue (9): 712-720 DOI: 10.11901/1005.3093.2020.065

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Corrosion Behavior of Ferritic Stainless Steel in High Temperature Urea Environment

HUANG Anran¹, ZHANG Wei²^,³, WANG Xuelin¹^,⁴, SHANG Chengjia¹(

), FAN Jiajie¹

1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2. Central Iron & Steel Research Institute, Beijing 100081, China
3. CITIC Metal Co. Ltd., Beijing 100004, China
4. Chongqing Tongliang High-tech Industrial Development Zone Management Committee, Chongqing 402560, China

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HUANG Anran, ZHANG Wei, WANG Xuelin, SHANG Chengjia, FAN Jiajie. Corrosion Behavior of Ferritic Stainless Steel in High Temperature Urea Environment. Chinese Journal of Materials Research, 2020, 34(9): 712-720.

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Abstract

In order to simulate the nitriding corrosion behavior of ferritic stainless steels in selective catalytic reduction (SCR) system of commercial vehicle, urea corrosion tests were carried out on three ferritic stainless steels (436L, 439M and 441) used in exhaust system of commercial vehicles. The influences of alloy composition and inclusions on high temperature urea corrosion resistance of ferritic stainless steels were investigated. The results show that under the synergistic effect of high temperature fatigue and oxidation, the high temperature and high nitrogen environment results in the rapid precipitation of chromium nitride particles at grain boundaris and in the local area of the ferritic stainless steels, resulting in chromium depletion. As 436L and 441 ferritic stainless steels contain higher Nb and Mo, thy present significantly higher resistance to high temperature urea corrosion rather than 439M. Moreover, due to the fine dispersion of inclusions in 436L and 441 stainless steels, the probability of nucleation and precipitation of chromium nitride on inclusions is also reduced, which is another cause for improving the resistance to high temperature urea corrosion of the relevant steels.

Key words: materials failure and protection high temperature urea corrosion intergranular corrosion EDS ferritic stainless steels nitriding mechanism inclusion

Received: 02 March 2020

ZTFLH:

TG142.71

Fund: CITIC Metal Co. Ltd(2018-D114/M611)

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	Anran HUANG
	Wei ZHANG
	Xuelin WANG
	Chengjia SHANG
	Jiajie FAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.065 OR https://www.cjmr.org/EN/Y2020/V34/I9/712

Table 1 Chemical composition of three test ferritic stainless steels (mass fraction, %)

Fig.1 Schematic diagram of experimental device

Fig.2 Thermal cycle process

Fig.3 SEM cross-sectional images of the oxidation products formed on three ferritic stainless steel samples: (a) 439M, (b) 436L and (c) 441

Fig.4 SEM images of internal corrosion layers of three ferritic stainless steel samples: (a) 439M, (b) 436L and (c) 441

Fig.5 Thicknesses of residual oxide layer and nitriding layer of three stainless steels: (a) 439M, (b) 436L, (c) 441

Fig.6 Total corrosion depths of three stainless steels

Fig.7 EDS results of 436L stainless steel: (a) secondary electron image and map scanning of (b) Cr, (c) Fe, (d) O, (e) C, (f) N

Fig.8 EDS results at the grain boundaries of 436L stainless steel: (a) secondary electron image, map scanning of (b) Cr, (c) N, (d) O, (e) C

Fig.9 EDS element area profiles of inclusion in (a) nitriding zone and (b) 436L steel substrate

Fig.10 Distributions of inclusions in three stainless steels: (a) 439M, (b) 441, (c) 436L

Fig.11 Statistical chart of inclusions sizes in three ferritic stainless steels

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