Preparation and Study of Accelerated Corrosion Test Spectrum of Low Alloy High Strength Steel in Polar Environment
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摘要: 针对低合金高强钢在极地低温环境下的腐蚀演化行为与寿命预测需求,开展极地环境加速试验环境谱及加速腐蚀试验方法研究,为探究低合金钢在低温、冻-融循环服役环境下的耐蚀性及腐蚀机理提供技术手段。根据中山站大气环境数据建立极地自然环境谱,将南极环境分为潮湿空气、冻融循环、低温冰冻3个阶段。利用大气腐蚀传感器,采用电化学工作站监测电偶电流变化,计算当量折算系数。通过盐雾-冻融-冰冻耦合加速腐蚀试验完成对南极腐蚀环境的仿真过程,为低温环境谱的编制提供方法及依据,编制的极地环境加速腐蚀试验环境谱与室外环境腐蚀具有较好的相关性。Abstract: Based on the requirement of the corrosion evolution and life prediction of high strength low alloy steel in the polar environment, the accelerated test environment spectrum and accelerated corrosion test method of steels in Antarctic environment are investigated, which can provide techniques for the study of the corrosion behaviors and resistance of low alloy steels serving in the low temperature and freeze-thawing environments. According to the atmospheric environmental parameters of Zhongshan station in the polar region, the Antarctic environment can be divided into three stages including the moist air, freeze-thaw cycle, and low temperature freezing environments. Then, the equivalent conversion factor is calculated based on the monitor of the galvanic corrosion current using atmospheric corrosion sensor. In the end, the simulation and acceleration process of the Antarctic corrosion environment are completed through salt spray, freeze-thaw, frozen coupling accelerated corrosion test, which provides references for the preparation of the accelerated corrosion test spectrum in the low temperature environment. The results demonstrate that the corrosion behavior under the accelerated spectrum exhibits superior consistency with the outdoor exposure test.
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