Effect of Exposure to Steam on Corrosion of Type 439 Stainless Steel for Automotive Mufflers

doi:10.11902/1005.4537.2015.227

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (2): 165-171 DOI: 10.11902/1005.4537.2015.227

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Effect of Exposure to Steam on Corrosion of Type 439 Stainless Steel for Automotive Mufflers

Changpeng WANG,Yufeng SHEN,Congcong CHEN,Moucheng LI(

)

Institute of Materials, Shanghai University, Shanghai 200072, China

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Abstract

The influence of steam on the corrosion behavior of 439 stainless steel for automotive mufflers was studied by means of cyclic hot air oxidation-immersion in condensate test and cyclic hot air oxidation-immersion in condensate-exposure to steam test as well as electrochemical measurements, SEM, XRD and pitting depth analyses. The results show that all the specimens, after cyclic hot air oxidation-immersion in condensate test and then with and without subsequent exposure to steam test, suffered from pitting corrosion with similar corrosion products. However, the specimens show lower corrosion resistance and deeper corrosion pits when they had experienced the exposure to steam test rather than those only experienced the cyclic hot air oxidation-immersion in condensate test. The exposure to steam may facilitate the growth of corrosion products and pits.

Key words: automobile exhaust system condensate corrosion steam pitting

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Changpeng WANG,Yufeng SHEN,Congcong CHEN,Moucheng LI. Effect of Exposure to Steam on Corrosion of Type 439 Stainless Steel for Automotive Mufflers. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 165-171.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.227 OR https://www.jcscp.org/EN/Y2016/V36/I2/165

Fig.1 Schematic diagrams of immersion test (a) and steam test (b)

Table 1 Single cycle procedures of GA and GB specimens in cyclic corrosion tests

Fig.2 SEM morphologies of corrosed specimens GA (a, c) and GB (b, d) before (a, b) and after (c, d) derusting, respectively

Fig.3 XRD patterns of corrosion products formed on the specimen surfaces after cyclic tests

Fig.4 Variations of corrosion potential of specimens with cyclic time

Fig.5 Nyquist (a, c) and Bode (b, d) plots for GA (a, b) and GB (c, d) specimens at different cycles

Fig.6 Equivalent circuit model for the corrosion of specimens in condensate solution

Fig.7 Fitted values for R_f (a) and R_t (b)

Fig.8 Pit depths of GA and GB specimens

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