目的 研究E690钢在热带大气环境下的早期腐蚀行为。方法 采用腐蚀图像识别技术,结合失重法、电化学方法和形貌观察,通过大气暴露试验,利用无人机图像采集系统获取E690钢表面腐蚀形貌图像,采用灰度直方图法确定图像阈值,并对灰度图像进行二值化处理,以获得E690钢表面腐蚀产物覆盖率。结合图像二值化结果、腐蚀产物覆盖率、开路电位、腐蚀速率及腐蚀截面形貌特征,对E690钢在热带大气环境下的早期腐蚀行为进行分析。结果 E690钢在热带大气环境中暴露后,表面腐蚀产物随时间的延长不断增多,腐蚀产物覆盖率持续提高。暴露7 d后,达到72.4%,暴露30 d后,试样表面基本被腐蚀产物覆盖,覆盖率达到95.2%,后期覆盖率变化较小。随着腐蚀产物的生成和锈层致密性的提高,腐蚀速率随暴露时间的延长逐渐降低,暴露30 d后,腐蚀速率变化较小,腐蚀趋于稳定。结论 基于腐蚀图像识别技术能够较好地反映E690钢在热带大气环境中的早期腐蚀行为规律,可实现对表面腐蚀产物分布进行定量表征,其结果与失重法、电化学测试及腐蚀截面形貌分析结果具有一致性,可应用于评估和预测E690钢在大气环境下的早期腐蚀行为。
Abstract
The work aims to investigate the early corrosion behavior of E690 steel in the tropical atmospheric environment. A corrosion image recognition technology was combined with the weight loss method, electrochemical testing, and morphological observation to obtain surface corrosion morphology images of E690 steel with a UAV image acquisition system during atmospheric exposure. The grey threshold was determined by the grey histogram method, and the images were binarised to obtain the corrosion product coverage on the steel surface. Combined with the binarisation results, corrosion product coverage, open circuit potential, corrosion rate, and cross-sectional morphology, the early corrosion evolution of E690 steel in atmospheric environment was analyzed. After exposure of E690 steel to the tropical atmospheric environment, the corrosion products on the steel surface increased continuously with exposure time, and the corrosion product coverage reached 72.4% after 7 days of exposure. After 30 days of exposure, the specimen surface was almost fully covered by corrosion products, the corrosion product coverage reached 95.2%, and the variation in coverage became slow. The corrosion rate gradually decreased as the exposure time increased, the corrosion rate changed little, and the corrosion tended to stabilize after 30 days of exposure. The corrosion image recognition technology can effectively reflect the evolution of early corrosion behavior of E690 steel in the tropical atmospheric environment and quantitatively characterize the distribution of surface corrosion products. The obtained results are consistent with those from the weight loss method, electrochemical testing, and cross-sectional morphology analysis, and can be used to evaluate and predict the early corrosion behavior of E690 steel in the atmospheric environment.
关键词
腐蚀形貌 /
图像分割 /
E690钢 /
热带大气环境 /
腐蚀产物覆盖率
Key words
corrosion morphology /
image segmentation /
E690 steel /
atmospheric environment /
corrosion product coverage
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基金
国家自然科学基金（52203293）; 广西重点研发计划项目（GK AB23026069）
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