Effect of Soot on Corrosion Behavior of 409 Stainless Steel

doi:10.11902/1005.4537.2017.013

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (5): 467-472 DOI: 10.11902/1005.4537.2017.013

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Effect of Soot on Corrosion Behavior of 409 Stainless Steel

Congcong CHEN¹,Yong YANG¹,Cheng ZHANG¹,Hongyun BI²,Moucheng LI¹(

)

1 Institute of Materials, Shanghai University, Shanghai 200072, China
2 Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China

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Abstract

The influence of soot on the corrosion behavior of 409 stainless steel for automotive muffler was studied by means of oxidation-immersion-evaporation cycle test with electrochemical impedance spectroscopy, XRD, SEM as well as pitting depth-and corrosion weight loss-measurement. The results show that the corrosion products formed on the sample surfaces are similar in the condensate liquids with and without soot. However, the corrosion potential increases lightly and both the pitting depth and weight loss become higher for the steel in the presence of soot. These can be attributed mainly to the galvanic effect between deposited soot and the stainless steel, which reduces the charge transfer resistance of the corrosion system and accelerates the corrosion of 409 stainless steel in the condensate solution.

Key words: soot automotive exhaust system corrosion stainless steel

Received: 18 January 2017

Fund: Supported by National Natural Science Foundation of China (51134010, U1660205) and Project of Science and Technology Commission of Shanghai Municipality (15XD1520100)

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Cite this article:

Congcong CHEN,Yong YANG,Cheng ZHANG,Hongyun BI,Moucheng LI. Effect of Soot on Corrosion Behavior of 409 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 467-472.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.013 OR https://www.jcscp.org/EN/Y2017/V37/I5/467

Fig.1 Variations of corrosion potentials of two kinds of specimens with cyclic times during oxidation-immersion test

Fig.2 Nyquist (a, b) and Bode (c, d) plots of S1 (a, c) and S2 (b, d) specimens after oxidation-immersion test fordifferent cycles

Fig.3 SEM morphologies of S1 (a, c) and S2 (b, d) specimens before (a, b) and after (c, d) removal of corrosion products on the surfaces

Fig.4 XRD patterns of the corrosion products formed on S1 and S2 specimens after oxidation-immersion test for 50 cycles

Fig.5 Depth values of the ten deepest pits on the surfaces of S1 and S2 specimens

Fig.6 Equivalent circuit for the corrosion of 409 stainless steel in condensate solution

Fig.7 Fitted values of R_f (a) and R_t (b) from EIS spectra of S1 and S2 specimens after test for different cycles

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