Q235和Q450钢在吐鲁番干热大气环境中长周期暴晒时的腐蚀行为研究

doi:10.11902/1005.4537.2017.153

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 431-437 DOI: 10.11902/1005.4537.2017.153

研究报告

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Q235和Q450钢在吐鲁番干热大气环境中长周期暴晒时的腐蚀行为研究

王力¹, 郭春云², 肖葵¹, 吐尔逊·斯拉依丁², 董超芳¹(

), 李晓刚¹

1 北京科技大学腐蚀与防护中心北京 100083
2 新疆吐鲁番自然环境试验研究中心吐鲁番 838200

Corrosion Behavior of Carbon Steels Q235 and Q450 in Dry Hot Atmosphere at Turpan District for Four Years

Li WANG¹, Chunyun GUO², Kui XIAO¹, Tuerxun·Silayiding², Chaofang DONG¹, Xiaogang LI¹

1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2 Xinjiang Turpan Natural Environmental Test Research Center, Turpan 838200, China

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摘要:

在吐鲁番干热大气环境中对Q235和Q450钢进行4 a大气暴晒实验。结果表明,两种钢表面均有较为明显的锈层,Q450耐候钢4 a的平均腐蚀速率为12 g·m^-2·a^-1,Q235钢平均腐蚀速率为14 g·m^-2·a^-1,Q450钢腐蚀速率相对较低,腐蚀坑深度较浅。腐蚀产物主要由α-FeOOH,γ-FeOOH和Fe₂O₃·H₂O组成,其中Q450钢腐蚀产物中α-FeOOH比例相对较高,腐蚀产物致密。电化学阻抗测试结果表明：Q450钢腐蚀产物电阻远大于Q235钢的,表面电荷转移电阻也大于Q235钢的,即Q450钢耐蚀性较好,腐蚀产物对基体保护作用相对较好。

关键词 ：碳钢, 吐鲁番, 大气腐蚀

Abstract：

Atmospheric exposure of carbon steels Q235 and Q450 were conducted for 4 a in dry hot atmospheric environment at Turpan district of Xinjiang Uygur Autonomous Region. The results showed that the surface of the two steels presented obvious corrosion products scale. The average corrosion rate of Q450 and Q235 was 12 and 14 g·m^-2·a^-1 respectively. Thus, Q450 steel exhibits corrosion rate lower than Q235 steel, and while the corresponding corrosion pits were relatively shallow. The corrosion products of the two steels composed mainly of α-FeOOH, γ-FeOOH and Fe₂O₃·H₂O, while the proportion of α-FeOOH for Q450 was higher than that for Q235. The corrosion products on Q450 were relatively dense. Thereby, it hindered the absorption of water and sediment, leading to the decrease of corrosion rate. The result of EIS demonstrated that the resistance of corrosion products and surface charge transfer of Q450 was greater than that of Q235, i.e. the corrosion products of Q450 had better protectiveness.

Key words： carbon steel Turpan atmospheric corrosion

收稿日期: 2017-09-20

ZTFLH:

TG172

基金资助:国家重点研发项目 (2017YFB0702300),国家自然科学基金 (51671029) 和中央高校基本科研基金 (FRF-TP-17-002B)

作者简介:

作者简介王力,男,1992年生,硕士生

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引用本文:

王力, 郭春云, 肖葵, 吐尔逊·斯拉依丁, 董超芳, 李晓刚. Q235和Q450钢在吐鲁番干热大气环境中长周期暴晒时的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 431-437.
Li WANG, Chunyun GUO, Kui XIAO, Tuerxun·Silayiding, Chaofang DONG, Xiaogang LI. Corrosion Behavior of Carbon Steels Q235 and Q450 in Dry Hot Atmosphere at Turpan District for Four Years. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 431-437.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.153 或 https://www.jcscp.org/CN/Y2018/V38/I5/431

表1 Q235和Q450钢的化学成分

表2 吐鲁番暴晒试验场2012.07~2013.07气象数据[5]

图1 Q235和Q450钢吐鲁番大气环境中暴晒4 a后的宏观形貌

图2 Q235和Q450钢经吐鲁番大气环境中暴晒4 a后的表面显微形貌

图3 Q235和Q450钢在吐鲁番大气环境中暴晒不同时间的腐蚀速率

图4 Q235和Q450钢在吐鲁番大气环境中暴晒4 a的腐蚀坑深度分布图

图5 Q235和Q450钢在吐鲁番大气环境中暴晒4 a的腐蚀坑深度

图6 Q235钢吐鲁番大气环境中暴晒4 a的腐蚀产物截面形貌及EDS分析结果

图7 Q450钢吐鲁番大气环境中暴晒4 a的腐蚀产物截面形貌及EDS结果

图8 Q235和Q450钢在吐鲁番大气环境中暴晒4 a后表面锈层的XRD谱

图9 Q235和Q450钢在吐鲁番大气环境中暴晒4 a后在0.1 mol/L Na2SO4溶液中的EIS曲线

图10 EIS结果拟合电路

表3 EIS拟合电路各元件参数值

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