带氧化皮<strong>Q345q</strong>钢在模拟西北典型大气环境中的腐蚀行为研究

doi:10.11901/1005.3093.2019.088

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 Yanwen^1,²,GUO Tieming^1,²(

),SONG Zhitao^1,²,NAN Xueli^1,²,XU Xiujie^1,²,DONG Zhilin^1,²

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+NaHSO₃solution, 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 words： metallic 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

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.088 或 https://www.cjmr.org/CN/Y2019/V33/I10/749

表1 Q345q钢的化学成分

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

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

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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