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将QPQ技术应用于65Mn钢,利用SEM和盐雾试验箱对QPQ渗层的显微组织和耐腐蚀性进行了分析研究,与未处理试样、发黑试样和盐浴渗氮试样进行对照试验;通过选择典型的氮化温度、氮化时间、氧化温度和氧化时间,设计了一组正交试验,以开始腐蚀时间和腐蚀速度为依据分析了QPQ处理中四种工艺参数对其耐腐蚀性的影响。结果表明:QPQ渗层表面平整,渗层由外到内依次是氧化膜、疏松层、化合物层和扩散层;对照试验中QPQ试样的耐腐蚀性最好,开始腐蚀时间是未处理试样的30倍;QPQ处理获得最高耐腐蚀性的工艺参数为氮化温度600℃,氮化时间1 h,氧化温度410℃,氧化时间40 min,该工艺参数下开始腐蚀时间为45 h,为未处理试样的54倍,腐蚀速度为2.02 g/(m2·h),为未处理试样的16%。
The QPQ technology was applied to 65Mn steel. The microstructure and corrosion resistance of QPQ layer were analyzed by SEM and salt spray chamber. Compared with untreated sample, black sample and salt bath nitriding sample A series of orthogonal experiments were designed by choosing typical nitriding temperature, nitriding time, oxidation temperature and oxidation time. Based on the initial corrosion time and corrosion rate, the effects of four process parameters on the resistance of QPQ Corrosive effects. The results show that the surface of QPQ layer is smooth and the outer layer of oxide layer, loose layer, compound layer and diffusion layer are in turn infiltrated layer. The QPQ sample has the best corrosion resistance and the initial corrosion time is the untreated sample QPQ treatment for the highest corrosion resistance of the process parameters for the nitriding temperature 600 ℃, nitriding time 1 h, oxidation temperature 410 ℃, oxidation time 40 min, the process parameters began to corrode for 45 h, is not The sample was treated 54 times with an etching rate of 2.02 g / (m2 · h), which was 16% of the untreated sample.