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为了开发既经济又具有良好耐冷凝液腐蚀性能的汽车排气系统用不锈钢,采用冷凝液腐蚀试验方法,对一系列的铁素体不锈钢进行了10周期的腐蚀评价研究。研究结果表明:Cr当量高于17%的铁素体不锈钢与Cr的质量分数为17%的铁素体不锈钢耐冷凝液腐蚀性能相当,且平均腐蚀失重量均小于6 g/m2,平均最大腐蚀深度均小于0.03 mm。在此试验结果的基础上,对新开发的439M型铁素体不锈钢和409L型铁素体不锈钢进一步开展5、10、20周期的冷凝液腐蚀试验,并使用极值分析方法对三种周期冷凝液腐蚀试验后样品的最大点蚀深度进行统计分析,研究结果表明,新开发的439M型铁素体不锈钢的预测寿命是409L的1.6倍。
In order to develop a stainless steel exhaust system for automotive exhaust systems that is economical and has good condensate corrosion resistance, a series of ferritic stainless steels were subjected to a 10-cycle corrosion evaluation study using a condensate corrosion test method. The results show that the corrosion resistance of ferritic stainless steel with 17% Cr equivalent and that of 17% ferritic stainless steel is equivalent, and the average corrosion loss is less than 6 g / m2. The average maximum corrosion Depth less than 0.03 mm. Based on the results of this test, the corrosion tests on the newly developed 439M ferritic stainless steel and 409L ferritic stainless steel were carried out for 5, 10 and 20 cycles of condensate corrosion, and the extreme value analysis method was used for three cycles of condensing The maximum pitting depth of the sample after the liquid corrosion test is statistically analyzed. The results show that the predicted life expectancy of the newly developed 439M ferritic stainless steel is 1.6 times that of 409L.