摘要
针对核电和航天工程不锈钢设备服役在高温高盐海洋环境中钝化和损伤的质检评估,提出显色检测图像分析钝化膜完整性分级的方法。以不同钝化及其损伤状态的316L不锈钢为研究对象,通过显色检测的红色色度图像分析与电化学腐蚀行为检测,建立显色色度与耐蚀性的关系,并获得分级范围。结果表明,显色色度随钝化膜损伤程度增加而增大,随自钝化时间的延长而减小;二次局部损伤在直方图中具有双峰特征;色度百分比和面积百分比呈现双对数线性二阶段特征;动电位极化和阻抗表明,点蚀电位和界面反应阻抗随损伤程度的增加而减小;耐蚀性随显色色度的增加而下降;最终获得了316L不锈钢钝化膜完整性的三个色度等级范围。这可为不锈钢钝化膜质检分级评估提供理论基础。
The quality inspection and evaluation of passivation and damage of stainless steel equipment in nuclear power and aerospace engineering in the high temperature and high salt marine environment and a method of grading the integrity of passive film based on chromaticity image analysis were proposed.Taking 316L stainless steel with different passivation and its damage state as the research object,through the analysis of red chromaticity image and electrochemical corrosion behavior detection,the relationship between chromaticity and corrosion resistance was established,and the grade range was obtained.The results show that the chromaticity increased with the increase of passive film damage and decreased with the increase of self-passivation time.There were two peaks in the histogram of secondary local damage.The chromaticity percen-tage and area percentage showed the characteristics of double logarithm linear two-stage.Potentiodynamic polarization and impedance showed that the pitting potential and interface reaction impedance decreased with the increase of damage degree.The corrosion resistance decreased with the increase of chromogenic chromaticity,and finally three chromaticity grades of 316L stainless steel passivation film integrity was obtained.This can provide a theoretical basis for the quality inspection and grading evaluation of stainless steel passivation films.
作者
赵晓燕
王冬颖
程从前
曹铁山
刘宝军
姚景文
赵杰
ZHAO Xiaoyan;WANG Dongying;CHENG Congqian;CAO Tieshan;LIU Baojun;YAO Jingwen;ZHAO Jie(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Nuclear Power Pump Industry Co.,Ltd.,Shenyang Blower Works Group Corporation,Shenyang 110869,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第3期168-172,共5页
Materials Reports
基金
国家自然科学基金(51571051)。
关键词
不锈钢
钝化膜损伤
化学钝化
显色检测
stainless steel
passive film damage
chemical passivation
color detection
