目的 系统探讨30CrMnMoRE特种结构钢在海洋大气环境下的腐蚀损伤行为。方法 在海南试验站对30CrMnMoRE钢开展为期1.5 a的海洋大气环境暴露试验,通过宏观腐蚀形貌、腐蚀截面形貌、表面微观形貌、腐蚀质量损失、拉伸性能等性能参数,综合分析该材料的海洋大气环境腐蚀损伤演变规律及机制。结果 30CrMnMoRE钢在海洋大气环境中发生了全面腐蚀,其腐蚀产物呈现红褐色,随时间推移逐渐从表面脱落。随着暴露时间的延长,平均腐蚀速率呈下降趋势,平均腐蚀深度变深。全面腐蚀行为对30CrMnMoRE钢的拉伸性能产生了显著不利影响。在暴露1.5 a后,其抗拉强度和断后伸长率分别下降14.0%和78.9%,表明腐蚀对材料塑性的影响远大于对抗拉强度的影响。结论 30CrMnMoRE钢在海洋大气环境中的适应能力较差,实际使用过程必须采取有效的防护措施,以确保其在海洋环境中长期可靠使用。
Abstract
The work aims to systematically investigate the corrosion damage behavior of 30CrMnMoRE steel in the marine atmospheric environment. A 1.5-year marine atmospheric exposure test was conducted on 30CrMnMoRE steel at a test station in Hainan. The corrosion behavior and mechanism of the material in the marine atmospheric environment were comprehensively analyzed based on macroscopic and microscopic corrosion morphologies, corrosion weight loss, tensile properties, etc. 30CrMnMoRE steel underwent general corrosion in the marine atmospheric environment, with its corrosion products appearing reddish-brown and gradually peeling off from the surface over time. The average corrosion rate showed a decreasing trend with the increasing exposure time, while the average corrosion depth increased. The general corrosion behavior had a significant adverse effect on the tensile properties of 30CrMnMoRE steel. After 1.5 years of exposure, the tensile strength and elongation after fracture decreased by 14.0% and 78.9%, respectively, indicating that the impact of corrosion on material ductility was much greater than that on tensile strength. In summary, 30CrMnMoRE steel exhibits poor adaptability in the marine atmospheric environment, so effective protective measures must be taken during actual use to ensure its long-term reliability in such conditions.
关键词
海洋大气环境 /
30CrMnMoRE特种结构钢 /
腐蚀行为 /
拉伸性能 /
腐蚀截面形貌 /
能谱分析 /
腐蚀速率
Key words
marine atmospheric environment /
30CrMnMoRE special structural steel /
corrosion behavior /
tensile properties /
corroded cross-sectional morphology /
energy spectrum analysis /
corrosion rate
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基金
XX材料及构件典型自然环境效应研究（XXXX2020209B001）
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