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采用氧化/冷凝液浸泡循环实验方法模拟汽车消声器内部环境,研究了409和304两种不锈钢在冷凝液中的电偶腐蚀行为。结果表明,无氧化作用时两种不锈钢间电偶腐蚀效应较弱,304钢对409钢的加速腐蚀作用很小。循环实验过程中,偶合电位较低时偶合电流密度往往较大。热氧化将明显增大两种不锈钢发生电偶腐蚀的倾向性,但氧化温度为250℃时稳定偶合电流密度较小、电偶腐蚀效应不显著,而氧化温度为400℃时409钢在循环过程中将发生局部腐蚀,呈现出较大的偶合电流密度,电偶腐蚀效应较强。
Oxidation / condensate immersion cycle experiment was used to simulate the internal environment of the muffler. The galvanic corrosion behavior of 409 and 304 stainless steel in condensate was studied. The results show that the galvanic corrosion effect between the two stainless steels is weak when no oxidation is applied and the accelerating corrosion of 304 steels to 409 steel is very small. During the cyclic experiment, the coupling current density tends to be larger when the coupling potential is lower. Thermal oxidation will obviously increase the galvanic corrosion tendency of the two stainless steels. However, when the oxidation temperature is 250 ℃, the stable coupling current density is small and the galvanic corrosion effect is not significant. When the oxidation temperature is 400 ℃, Will occur in the local corrosion, showing a larger coupling current density, strong galvanic corrosion effect.