Q235钢在薄液膜下腐蚀行为与图像信息的相关性研究

doi:10.11902/1005.4537.2017.068

中国腐蚀与防护学报

2017, Vol. 37

Issue (5): 444-450 DOI: 10.11902/1005.4537.2017.068

研究报告

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Q235钢在薄液膜下腐蚀行为与图像信息的相关性研究

张新新¹,高志明¹(

),胡文彬¹,伍志鹏¹,韩连恒¹,卢丽花¹,修妍²,夏大海¹

1 天津大学材料科学与工程学院天津市材料复合与功能化重点实验室天津 300350
2 天津城建大学理学院天津 300384

Correlation Between Corrosion Behavior and Image Information of Q235 Steel Beneath Thin Electrolyte Film

Xinxin ZHANG¹,Zhiming GAO¹(

),Wenbin HU¹,Zhipeng WU¹,Lianheng HAN¹,Lihua LU¹,Yan XIU²,Dahai XIA¹

1 Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300350, China
2 Faculty of Science, Tianjin Chengjian University, Tianjin 300384, China

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摘要:

研究了大气腐蚀环境下Q235钢腐蚀行为,通过图像处理获取锈层组成的信息。将电化学监测和图像分析相结合,通过提取图像特征参数,并与电化学信息进行对比分析,研究Q235钢在薄液膜下腐蚀行为与图像信息的相关性。结果表明,Q235钢大气腐蚀始于珠光体,出现局部区域优先腐蚀特征;随着腐蚀进行,出现均匀化特征。丝束电极分析表明,随着时间增加,Q235钢腐蚀电位降低,腐蚀电位标准差减小,阳极区域不断扩大。神经网络图像分析表明,随时间增加,锈层中α-FeOOH的含量增加,对氧的扩散出现阻挡作用,促使局部腐蚀向均匀腐蚀转变。腐蚀行为与图像特征信息具有相关性,即与局部腐蚀向均匀腐蚀转变进而速率减缓相对应,表面出现完整腐蚀产物层。

关键词 ：大气腐蚀, Q235钢, 彩色图像处理, 锈层演化

Abstract：

The corrosion behavior of Q235 steel beneath electrolyte thin films of 0.01 mol/L NaCl solution was conducted to simulate marine atmospheric corrosion by simultaneous electrochemical measurements and acquisition of corrosion images. The results show that atmospheric corrosion of Q235 steel initiates around pearlites and presents the character of local corrosion which developed to become uniform corrosion afterwards. According to the result of wire beam electrode (WBE) measurement, the mean corrosion potential and the corrosion potential standard deviation decreased, and the anode area enlarged with the exposure time. Analysis of the neural network shows that the content of α-FeOOH in rust layers increased with exposure time, which blocked the process of oxygen diffusion, resulting in the transformation of corrosion mode from local ones to uniform ones. In conclusion, when the electrochemical information shows that the corrosion tends to transform from the local ones to the uniform ones, correspondingly the image information also shows that a protective rust gradually formed with the increasing exposure time. Therefore, the corrosion behavior of Q235 steel presents well correlation with the feature of image information.

Key words： atmospheric corrosion Q235 steel color image processing rust layer

收稿日期: 2017-05-05

基金资助:国家自然科学基金 (51371124和51671144),国家基础研究发展计划 (2014CB046805) 及教育部人文科学研究青年基金项目 (11YJCZH202)

作者简介: 张新新,女,1993年生,硕士生

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引用本文:

张新新,高志明,胡文彬,伍志鹏,韩连恒,卢丽花,修妍,夏大海. Q235钢在薄液膜下腐蚀行为与图像信息的相关性研究[J]. 中国腐蚀与防护学报, 2017, 37(5): 444-450.
Xinxin ZHANG, Zhiming GAO, Wenbin HU, Zhipeng WU, Lianheng HAN, Lihua LU, Yan XIU, Dahai XIA. Correlation Between Corrosion Behavior and Image Information of Q235 Steel Beneath Thin Electrolyte Film. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 444-450.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.068 或 https://www.jcscp.org/CN/Y2017/V37/I5/444

图1 Q235钢在模拟海洋大气环境下腐蚀不同时间后的表面形貌图

图2 Q235钢腐蚀不同时间后腐蚀电位和电流的分布

图3 平均腐蚀电位随时间变化曲线

图4 腐蚀电位标准偏差随时间的变化

图5 阳极区域随时间变化

表1 样品RGB与α-FeOOH比重的关系

图7 RGB色彩分布的柱状图

图8 神经网络拟合分析图

图6 锈层由外至内的彩色形貌图

表2 锈层组成分析结果

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