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Performance of Ferritic Stainless Steels for Automobile Muffler Corrosion

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Abstract Corrosion behavior of ferritic stainless steels was studied in artificial exhaust gas condensates containing corrosive ions such as Cl− and SO32−. Continuous immersion tests in flasks and Dip & Dry tests by using the alternate corrosion tester with a heating system clarified the effects of chromium and molybdenum additions on the corrosion resistance of a ferritic stainless steel in the artificial exhaust gas condensates. Effects of surface oxidation on the corrosion behavior were investigated in a temperature range of 573K to 673K. Oxidation at 673K reduced the corrosion resistance of the ferritic stainless steels in the artificial environment of the automobile muffler. Particulate matter deposited on the muffler inner shell from the automobile exhaust gas was also examined. Deposited particulate matter increased the corrosion rate of the ferritic stainless steel. Finally, we also investigated the corrosion of the automobile mufflers made of Type 436L ferritic stainless steel with 18% chromium - 1.2% molybdenum after 24 months, in Japan. The sets of results clarified that Type 436L ferritic stainless steel as the material for the automobile muffler exhibited acceptable corrosion resistance.
Title: Performance of Ferritic Stainless Steels for Automobile Muffler Corrosion
Description:
Abstract Corrosion behavior of ferritic stainless steels was studied in artificial exhaust gas condensates containing corrosive ions such as Cl− and SO32−.
Continuous immersion tests in flasks and Dip & Dry tests by using the alternate corrosion tester with a heating system clarified the effects of chromium and molybdenum additions on the corrosion resistance of a ferritic stainless steel in the artificial exhaust gas condensates.
Effects of surface oxidation on the corrosion behavior were investigated in a temperature range of 573K to 673K.
Oxidation at 673K reduced the corrosion resistance of the ferritic stainless steels in the artificial environment of the automobile muffler.
Particulate matter deposited on the muffler inner shell from the automobile exhaust gas was also examined.
Deposited particulate matter increased the corrosion rate of the ferritic stainless steel.
Finally, we also investigated the corrosion of the automobile mufflers made of Type 436L ferritic stainless steel with 18% chromium - 1.
2% molybdenum after 24 months, in Japan.
The sets of results clarified that Type 436L ferritic stainless steel as the material for the automobile muffler exhibited acceptable corrosion resistance.

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