采用失重法和XRD法研究了AF1410钢在中性盐雾环境中的耐蚀性能,并对中性盐雾预腐蚀不同时间后的试样进行疲劳性能测试,研究了不同预腐蚀时间对材料疲劳寿命的影响.结果表明:AF1410钢发生了严重的全面腐蚀,腐蚀产物主要由FeO(OH)和Fe_3O_4组成,并得到其腐蚀失重曲线;疲劳断口形貌分析表明,随预腐蚀时间的延长,腐蚀损伤程度增加,在疲劳加载过程中易形成较多的疲劳裂纹扩展源而导致疲劳断裂失效;最终获得中性盐雾预腐蚀AF1410钢结构疲劳寿命特性以及预腐蚀对疲劳寿命的影响系数C(t)曲线.
The corrosion resistance of AF1410 steel in the neutral salt spray environment was studied using the methods of weight loss and XRD. After different precorrosion time in the neutral salt spray, the fatigue properties of the specimens were tested, and the influences of the different precorrosion time on the fatigue life of the material were investigated. The results showed that serious all-around corrosion happened on the AF1410 steel, and the corrosion products are mainly FeO(OH) and Fe_3O. The corrosion weight loss curve was plotted, and the fatigue fracture morphology was observed. It was shown that with the increasing of the corrosion time, the degree of the corrosion damage increased and more fatigue crack initiations were apt to take shape, which led to the final fatigue rupture. Finally, the fatigue life properties of AF1410 steel after neutral salt spray corrosion were obtained and the influence coefficient C(t) of the pre-corrosion on the fatigue life was plotted.
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