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采用氧化-冷凝液浸泡循环方法模拟了汽车长距离行驶条件下消声器的内部服役环境,并对比研究了409,429,436,439和441等5种不锈钢的冷凝液腐蚀行为。结果表明:5种不锈钢表面氧化/腐蚀产物膜均主要由Cr2O3和Fe2O3组成。合金元素Cr与Mo对不锈钢表面产物膜电阻及电荷转移电阻的影响最为显著。腐蚀坑深度从大到小依次为409,439,441,429和436不锈钢,但439与441不锈钢以及429与436不锈钢的腐蚀深度相差很小,并且5种不锈钢在汽车长距离行驶条件下均表现出良好的耐蚀性。
The internal service environment of the muffler under long-distance driving conditions was simulated by oxidation-condensation immersion cycle method. The corrosion behavior of condensate of 409 stainless steel, 409, 436, 439 and 441 stainless steel was studied. The results show that the oxide / corrosion products of the five kinds of stainless steel are mainly composed of Cr2O3 and Fe2O3. The effects of alloying elements Cr and Mo on the surface resistance and charge transfer resistance of stainless steel are the most significant. The depths of the corrosion pits are 409,439,441,429 and 436 stainless steel in descending order, but the corrosion depths of 439 and 441 stainless steel and 429 and 436 stainless steel are very small, and the five kinds of stainless steel show good corrosion resistance under long-distance driving conditions .