模拟海洋和一般大气环境下锈蚀钢材表面形貌差异研究  

Difference in Surface Characteristics of Corroded Steel Under Simulated Marine and General Atmosphere Environment

作　　者：徐善华[1] 宋翠梅 李晗 XU Shanhua;SONG Cuimei;LI Han(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Wuhan Zhenghua Architectural Design Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安7100552 [2]武汉正华建筑设计有限公司,武汉430000

出　　处：《材料导报》2021年第2期2125-2132,共8页Materials Reports

基　　金：国家自然科学基金(51678477)。

摘　　要：为了研究海洋和一般大气环境下锈蚀钢材表面形貌的差异,开展了模拟两种环境下钢试件的加速腐蚀试验。采用非接触式三维形貌扫描仪PS50获得锈蚀钢材的表面形貌,并通过编程提取钢材表面的蚀坑参数,包括平均蚀坑深度h、平均蚀坑深宽比A r、蚀坑密度P d,以及粗糙度参数如均方根高度S q、界面扩展面积比S dr和分形维数D。通过分析以上各参数和测试区域非均匀体积损失率ξs之间的关系,得到了两种环境下锈蚀钢材表面形貌的演化规律及差异。结果表明,与模拟一般大气环境相比,模拟海洋大气环境下的试件具有更小的平均蚀坑深度h和更大的平均蚀坑深宽比A r,蚀坑形状更加浅而窄;模拟海洋大气环境下试件的粗糙度参数S q、S dr和D均大于模拟一般大气环境下的试件,其表面具有更大的高度差异、褶皱面积和更显著的形貌幅值变化;模拟海洋大气环境下试件表面蚀坑分布集中,局部腐蚀更为显著;模拟一般大气环境下试件表面蚀坑分布分散,更偏向全面腐蚀。In order to investigate the difference in surface characteristics of corroded steel under simulated marine atmosphere and simulated general atmosphere environment, two accelerated corrosion tests were carried out. The corrosion morphology was obtained by a non-contact 3D profiler PS50. By extracting the average pit depth h , the average aspect ratio A r, the pit density P d and calculating the corrosion parameters such as the root mean square height S q、the developed interfacial area ratio S dr and the fractal dimension D , the evolution of corrosion and the environment effects were studied. The results show that compared with the specimens in the simulated general atmosphere environment, those in the simulated marine atmosphere environment have a smaller h and a larger A r, which refers to shallower and narrower pits;the roughness parameters S q, S dr and D of the specimens in the simulated marine atmosphere environment are larger than those in the simulated general atmospheric environment, which means a greater height difference, fold area and more significant changes in topographic amplitude;the specimens in the simulated marine atmosphere environment have concentrated pits and local corrosion is significant while the specimens in the simulated general atmosphere environment have scattered pits and are more inclined to overall corrosion.

关 键 词：表面形貌 非均匀体积损失率 蚀坑分析 粗糙度参数 

分 类 号：TU511[建筑科学—建筑技术科学]