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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (3): 233-238    DOI: 10.11902/1005.4537.2014.080
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Galvanic Corrosion Behavior of Two Stainless Steels in Simulated Muffler Environments
Qiang WEI,Moucheng LI(),Jianian SHEN
Institute of Materials, Shanghai University, Shanghai 200072, China
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Abstract  

The cyclic method of hot air oxidation/immersion in condensates was adopted to simulate the internal service conditions of automotive mufflers. The galvanic corrosion between type 409 and 304 stainless steels was investigated during the condensates immersion by using electrochemical measurements. The results of coupling potential and current indicate that the galvanic corrosion effect is very weak between these two steels without suffered from hot air oxidation. This means that 304 stainless steel can hardly accelerate the corrosion of 409 stainless steel as they contact directly in the condensate solutions. During the cyclic tests, the two steels show relatively higher values for the coupling current in the low coupling potential cases. Hot air oxidation will enhance the galvanic corrosion tendency between the two steels. However, they show small coupling current densities after cyclic oxidation at 250 ℃, with weak galvanic corrosion effect between them. Whereas they display large coupling current densities (i.e. strong galvanic corrosion effect) with the occurrence of localized corrosion after cyclic oxidation at 400 ℃.
Key words:  automotive exhaust system      muffler      stainless steel      galvanic corrosion      condensate corrosion     
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Qiang WEI
Moucheng LI
Jianian SHEN

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Qiang WEI,Moucheng LI,Jianian SHEN. Galvanic Corrosion Behavior of Two Stainless Steels in Simulated Muffler Environments. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 233-238.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.080     OR     https://www.jcscp.org/EN/Y2015/V35/I3/233

Steel Cr Ni Mn Si C P S N Cu Ti Fe
304 18.11 8.19 1.06 0.43 0.05 0.025 0.001 0.039 0.55 --- Bal.
409 11.46 0.09 0.54 0.45 0.007 0.025 0.002 --- 0.02 0.19 Bal.
Table 1  Chemical compositions of two stainless steels used in the experiments
Fig.1  Corrosion potential vs time curves for 409 and 304 steels in the condensate solution
Fig.2  Galvanic potential (Eg) and current density (Ig) vs time curves of 409 and 304 steels
Fig.3  Variations of corrosion potential of two steels with cyclic times of oxidation/immersion tests under 250 ℃ (a) and 400 ℃ (b) oxidation conditions
Fig.4  Galvanic potential Eg (a) and current density Ig (b) vs time curves of 409 and 304 steels after 250 ℃ oxidation-immersion test for different time
Fig.5  Eg (a) and Ig (b) vs time curves of 409 and 304 steels after 400 ℃ oxidation-immersion test for different time
Fig.6  Variations of galvanic potential and current density of two steels with cyclic times of the oxidation-immersion tests under 250 ℃ (a) and 400 ℃ (b) oxidation conditions
Fig.7  SEM morphologies of 409 steel after 30 cycles of oxidation-immersion test under different conditions: (a) 250 ℃-oxidation without coupling, (b) 250 ℃-oxidation with coupling, (c) 400 ℃-oxidation without coupling, (d) 400 ℃-oxidation with coupling
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