Research on the Simulated Plateau Corrosion Behavior of Welded Joints of Q500qENH Weathering Steel
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摘要: 为研究Q500qENH耐候钢焊接接头在高原地区的耐腐蚀性能,针对青藏高原地区以工业大气为主的复杂污染环境进行了周期浸润腐蚀模拟试验,对Q500qENH耐候钢的母材试件及V形和Y形焊接接头试件进行了加速腐蚀试验。试验中设定了4个腐蚀周期,分别为0、9、18、27 d,通过对比不同腐蚀周期下的腐蚀率、截面损失率、腐蚀速率及腐蚀深度等数据,评估了周期浸润腐蚀试验的加速性。结果表明:Q500qENH耐候钢的腐蚀过程分层明显,突出呈现为快速腐蚀阶段和缓慢腐蚀阶段。在相同腐蚀周期下,焊接接头试件的腐蚀速率始终高于母材试件,但随着时间推移其差值呈先增大、后减小,最终趋于稳定的变化趋势,通过将周期浸润试验结果与自然大气曝露腐蚀试验结果进行当量转换,发现青藏高原地区以工业大气为主的复杂污染环境下的腐蚀速率极为缓慢,腐蚀时间远超30年阈值。Abstract: In order to study the corrosion resistance of Q500qENH weathering steel welded joints in the plateau area, a cyclic immersion corrosion simulation test was carried out for the complex polluted environment dominated by an industrial atmosphere in the Qinghai-Tibet Plateau region. Accelerated corrosion tests were carried out on the base metal specimens, as well as V-type and Y-type welded joint specimens of Q500qENH weathering steel. Four corrosion cycles were set in the test: 0 d, 9 d, 18 d, and 27 d. By comparing the corrosion rate, cross-section loss rate, corrosion velocity, and corrosion depth under different corrosion cycles, the acceleration of the cyclic immersion corrosion test was evaluated. The results showed that the corrosion process of Q500qENH weathering steel had obvious stratification, which was highlighted as a rapid corrosion stage and a slow corrosion stage. Under the same corrosion cycle, the corrosion speed of the welded joint specimens was consistently higher than that of the base metal specimens. However, the difference between them initially increased, then decreased, and eventually stabilized over time. By equivalently converting the results of the cyclic immersion test and the natural atmospheric exposure corrosion test, it was found that the corrosion speed was extremely slow in the complex polluted environment (dominated by an industrial atmosphere in the Qinghai-Tibet Plateau region), and the corrosion time would be far more than 30 years.
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Key words:
- weathering steel /
- cyclic immersion corrosion /
- corrosion resistance /
- welded joints /
- plateau area
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