【摘要】 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。更多还原

【Abstract】 One oxidation-condensate immersion cyclic method was used to simulate muffler internal service environment under the long-distance driving conditions. The corrosion behavior of type409, 429, 436, 439 and 441 stainless steels was investigated in the condensate solutions. The results show that the oxidation/corrosion product films on the surfaces of these five steels are mainly composed of Cr2O3 and Fe2O3. The alloying elements Cr and Mo play the most important role in the resistance of product films and charge transfer processes on steel surfaces. Pit depth decreases in order of 409, 439, 441, 429 and 436, but there is small depth difference between 439 and 441 as well as 429 and 436. Moreover, these five stainless steels show good pit resistance in the simulated processes of long-distance driving trips.更多还原