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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (1): 20-24    DOI: 10.11902/1005.4537.2015.006
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Condensate Corrosion Behavior of Stainless Steels for Automotive Mufflers
Hui ZHANG,Guoli ZHANG,Xing LIU,Congcong CHEN,Moucheng LI()
Institute of Materials, Shanghai University, Shanghai 200072, China
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Abstract  

One oxidation-condensate immersion cyclic method was used to simulate muffler internal service environment under the long-distance driving conditions. The corrosion behavior of type 409, 429, 436, 439 and 441 stainless steels was investigated in the condensate solutions. The results show that the oxidation/corrosion product films on the surfaces of these five steels are mainly composed of Cr2O3 and Fe2O3. The alloying elements Cr and Mo play the most important role in the resistance of product films and charge transfer processes on steel surfaces. Pit depth decreases in order of 409, 439, 441, 429 and 436, but there is small depth difference between 439 and 441 as well as 429 and 436. Moreover, these five stainless steels show good pit resistance in the simulated processes of long-distance driving trips.
Key words:  automotive muffler      condensate corrosion      oxidation      stainless steel      long-distancedriving     
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Hui ZHANG
Guoli ZHANG
Xing LIU
Congcong CHEN
Moucheng LI

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Hui ZHANG,Guoli ZHANG,Xing LIU,Congcong CHEN,Moucheng LI. Condensate Corrosion Behavior of Stainless Steels for Automotive Mufflers. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 20-24.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.006     OR     https://www.jcscp.org/EN/Y2016/V36/I1/20

Steel C Si Mn S P Cr Ni Mo Nb Ti N Fe
409 0.009 0.35 0.21 0.001 0.023 11.40 0.09 0.005 0.14 0.14 0.0074 Bal.
429 0.011 0.94 0.93 0.001 0.025 14.26 0.22 0.45 0.40 0.20 0.0092 Bal.
439 0.011 0.40 0.25 0.002 0.017 16.76 0.08 0.004 0.021 0.23 0.0076 Bal.
436 0.012 0.42 0.28 0.002 0.018 17.61 0.08 0.75 0.01 0.22 0.0095 Bal.
441 0.009 0.44 0.27 0.001 0.028 18.18 0.13 0.005 0.42 0.17 0.0063 Bal.
Table 1  Chemical compositions of stainless steels used in the experiments(mass fraction / %)
Fig.1  Plots of corrosion potential vs time for five stainless steels after 100 cycles test in condensate solution
Fig.2  Nyquist (a) and Bode (b) plots for five stainless steels in condensate solution after 100 cycles test
Fig.3  SEM morphologies of 409 (a), 429 (b), 439 (c), 436 (d) and 441 (e) stainless steels after the cyclic tests
Fig.4  XRD spectra of different specimens after the cyclic tests
Fig.5  Maximum and average values of pit depth for different specimens after the cyclic tests
Fig.6  Equivalent circuit model for the corrosionsystems
Fig.7  Fitted values of impedance parameters for different specimens after 100 cycles test
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