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材料研究学报  2019, Vol. 33 Issue (10): 749-762    DOI: 10.11901/1005.3093.2019.088
  研究论文 本期目录 | 过刊浏览 |
带氧化皮Q345q钢在模拟西北典型大气环境中的腐蚀行为研究
张延文1,2,郭铁明1,2(),宋志涛1,2,南雪丽1,2,徐秀杰1,2,董志林1,2
1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室 兰州 730050
2. 兰州理工大学材料科学与工程学院 兰州 730050
Corrosion Behavior of Q345q Steel with Oxide Scale in Simulated Typical Atmospheric Environmentin Northwest China
ZHANG Yanwen1,2,GUO Tieming1,2(),SONG Zhitao1,2,NAN Xueli1,2,XU Xiujie1,2,DONG Zhilin1,2
1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
引用本文:

张延文,郭铁明,宋志涛,南雪丽,徐秀杰,董志林. 带氧化皮Q345q钢在模拟西北典型大气环境中的腐蚀行为研究[J]. 材料研究学报, 2019, 33(10): 749-762.
Yanwen ZHANG, Tieming GUO, Zhitao SONG, Xueli NAN, Xiujie XU, Zhilin DONG. Corrosion Behavior of Q345q Steel with Oxide Scale in Simulated Typical Atmospheric Environmentin Northwest China[J]. Chinese Journal of Materials Research, 2019, 33(10): 749-762.

全文: PDF(13457 KB)   HTML
摘要: 

采用XRD、扫描电子显微镜、电化学技术、干湿交替腐蚀试验研究了Q345q钢的热轧氧化皮结构及其在三种模拟西北几种典型大气环境中的腐蚀行为,并探讨了不同介质环境下热轧氧化皮的破坏机理和锈层形成机理。结果发现,热轧氧化皮的相组成主要是Fe3O4和Fe2O3,氧化皮的结构为多孔状,并带有裂纹等缺陷;带氧化皮钢在进行干湿交替加速腐蚀实验后,虽然在NaHSO3溶液中腐蚀增重最高,但自腐蚀电位随腐蚀时间的延长增大,腐蚀后期自腐蚀电流密度减小,锈层保护性较好;而在除冰盐介质中的腐蚀速率最小,主要发生以Cl-为主的点蚀,形成“大阴极-小阳极”腐蚀特征,而且含有β-FeOOH、HFeCl4(H2O)6等腐蚀产物,导致锈层疏松脱落,锈层的自腐蚀电流密度增大,锈层不具保护性;在除冰盐+NaHSO3溶液中,既发生点蚀又伴随全面腐蚀,由于Cl-和HSO3-的协同作用,降低了一部分Cl-的自催化效应,但多数α-FeOOH是由β-FeOOH转化而来的,锈层保护性不强。

关键词 金属材料Q345q钢氧化皮除冰盐NaHSO3混合溶液西北典型大气    
Abstract

The structure of the oxide scale on the as received hot-rolled bridge steel Q345q and the corrosion behavior of the steel Q345q with oxide scale in three simulated atmospheric environments in Northwest China were studied by XRD, scanning electron microscopy, electrochemical technique and wet-dry alternating corrosion test. The results show that the hot-rolled oxide scale composes mainly of Fe3O4 and Fe2O3, which is porous with cracks and other defects. After the dry-wet alternating accelerated corrosion test of the steel Q345q with oxide scale, although the corrosion weight loss is the highest in NaHSO3 solution, the free-corrosion potential increases with the corrosion time, and the free-corrosion current density decreases in the later stage of corrosion. As far as the morphology of the rust layer and the ratio of γ/α* are concerned, the rust layer formed on the steel presents good stability; However, in deicing salt solution, the corrosion rate is the smallest, but the steel suffered mainly from Cl--dominated pitting corrosion with the corrosion characteristics of "large cathode and small anode". Its corrosion products contain such as β-FeOOH and HFeCl4(H2O)6, which results in loose rust layer with poor protectiveness and increased free-corrosive current density; In deicing salt+NaHSO3 solution, both pitting corrosion and general corrosion occur. Due to the synergistic effect of Cl- and HSO3-, the autocatalytic effect of a part of Cl- is reduced, but most α-FeOOH is converted from β-FeOOH, which resulted in the poor protective rust layer.

Key wordsmetallic materials    Q345q steel    oxide scale    deicing salt    sodium bisulfite    mixed solution    typical atmosphere in northwest China
收稿日期: 2019-01-30     
ZTFLH:  TG172.3  
基金资助:国家自然科学基金(51461029);广东省“扬帆计划”引进创新创业团队专项(2015YT02G090);甘肃省交通厅科研项目(2017-16);甘肃省交通厅科研项目(2017-19)
作者简介: 张延文,男,1993年生,硕士生
CSiMnPSCEVFe
0.1580.2461.2450.0230.0220.370Bal.
表1  Q345q钢的化学成分
Corrosion solutionCompositionpHGB
Mixed solutionDeicing salt+0.01 mol/L NaHSO34.8±0.2-
Deicing saltNa2SO4 0.500±0.002 g9±0.2GB/T 19746-2005
Na2SO3 0.250±0.002 g
Na2S2O3 0.100±0.002 g
NaCl 52.5±1 g
CaCl2·2H2O 52.5±1 g
NaHSO30.01 mol/LNaHSO34.4±0.2TB/T2375-1993
表2  三种腐蚀溶液的成分
图1  带氧化皮Q345q钢在三种不同溶液中的腐蚀动力学曲线
图2  腐蚀动力学双对数拟合曲线
图3  氧化皮原始样及带氧化皮试样在三种溶液中腐蚀不同时间的XRD谱图
Sampleβ-FeOOHγ-FeOOHα-FeOOHFe2O3Fe3O4α/γ*
Deicing salt0.220.160.060.250.310.0869
NaHSO3-0.190.240.310.350.4444
Deicing salt+NaHSO30.260.170.120.200.250.1765
表3  带氧化皮Q345q钢腐蚀480 h后锈层物相的相对含量及α/γ*值
图4  带氧化皮Q345q钢在3种溶液中腐蚀不同时间的宏观形貌
图5  带氧化皮Q345q钢的表面形貌和截面形貌
图6  带氧化皮Q345q钢在3种溶液中腐蚀不同时间的微观形貌
图7  带氧化皮Q345q钢在3种溶液中腐蚀480 h的微观形貌
图8  带氧化皮Q345q钢在3种溶液中腐蚀不同时间的截面形貌
图9  带氧化皮Q345q钢在除冰盐和混合溶液中腐蚀不同时间的截面局部放大形貌
图10  带氧化皮Q345q钢在3种溶液中腐蚀480 h的截面形貌
图11  带氧化皮Q345q钢在三种溶液中腐蚀不同时间后的极化曲线
Corrosion solutionParameters24 h72 h144 h288 h480 h
Deicing saltEcorr/V-0.6693-0.6969-0.7279-0.6797-0.6316
Icorr/mA·cm-20.13890.18040.13380.18430.2977
NaHSO3Ecorr/V-0.9795-0.9758-0.8899-0.7693-0.6764
Icorr/mA·cm-20.13050.10480.10920.14750.0558
Deicing salt+NaHSO3Ecorr/V-0.6659-0.7141-0.7798-0.7074-0.6868
Icorr/mA·cm-20.17370.18360.19510.18930.1747
表4  带氧化皮Q345q钢在3种溶液中腐蚀不同时间后的电化学参数
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