Effect of environmental temperature on condensate corrosion of type 409 stainless steel in automotive mufflers
The corrosion behaviour of 409 stainless steel oxidized cyclically at various environmental temperatures was studied in the simulated condensate solution of mufflers.The oxidation is accelerated by increasing the temperature from 200 to 400℃.The presence of condensates dipped on the specimen surface may enhance the oxidation process,leading to form defective oxide films and Cr-depletion underlying the films especially at 400℃.Sulfate from the condensate-dipping will give rise to sulfidation during the cyclic oxidation,being detrimental to both the oxidation and corrosion properties of stainless steel.The oxidation lower than 250℃ enhances the passive state of stainless steel while oxidations above 300℃ deteriorate its corrosion resistance,even into active corrosion.The active corrosion through the defects such as cracks and nodules in oxide films may be responsible for the perforation of mufflers.
stainless steel condensate corrosion oxidation automotive exhaust system
LI Moucheng WANG Shidong WEI Qiang BI Hongyun
Institute of Materials,Shanghai University,Shanghai 200072,China Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China
国内会议
上海
英文
1-9
2013-06-01（万方平台首次上网日期，不代表论文的发表时间）