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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.
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Received: 18 January 2017
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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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