<strong>Q235</strong>钢结构件表面热镀锌层的应力腐蚀及其机理

doi:10.11902/1005.4537.2023.324

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1305-1315 CSTR: 32134.14.1005.4537.2023.324 DOI: 10.11902/1005.4537.2023.324

研究报告

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Q235钢结构件表面热镀锌层的应力腐蚀及其机理

赵骞¹, 张洁¹, 毛锐锐², 缪春辉¹, 卞亚飞², 滕越¹, 汤文明²(

)

1 国网安徽省电力有限公司电力科学研究院合肥 230601
2 合肥工业大学材料科学与工程学院合肥 230009

Stress Corrosion and Its Mechanism of Hot-dip Galvanized Coating on Q235 Steel Structure

ZHAO Qian¹, ZHANG Jie¹, MAO Ruirui², MIAO Chunhui¹, BIAN Yafei², TENG Yue¹, TANG Wenming²(

)

1 Electric Power Research Institute, Anhui Electric Power Co., Ltd., State Grid, Hefei 230601, China
2 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

引用本文:

赵骞, 张洁, 毛锐锐, 缪春辉, 卞亚飞, 滕越, 汤文明. Q235钢结构件表面热镀锌层的应力腐蚀及其机理[J]. 中国腐蚀与防护学报, 2024, 44(5): 1305-1315.
Qian ZHAO, Jie ZHANG, Ruirui MAO, Chunhui MIAO, Yafei BIAN, Yue TENG, Wenming TANG. Stress Corrosion and Its Mechanism of Hot-dip Galvanized Coating on Q235 Steel Structure[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1305-1315.

全文: PDF(18955 KB) HTML

摘要:

采用自制的三点弯曲应力加载装置及浸泡腐蚀实验方法，开展电网设备常用的Q235镀锌钢结构件表面镀锌层应力腐蚀行为的研究。结果表明，Q235钢板镀锌层表面应力腐蚀是ZnO、Zn(OH)₂和Zn₅(OH)₈Cl₂∙H₂O等腐蚀产物的形成(明显的腐蚀坑)、脱落(无明显腐蚀坑)、再形成、再脱落的过程。随着外加应力的增大，Q235钢板镀锌层腐蚀表面的E_corr降低，I_corr增大，电化学阻抗减小，应力腐蚀程度增加，形成更多Zn₅(OH)₈Cl₂∙H₂O腐蚀产物。建立了Q235钢板镀锌层应力腐蚀模型，阐明其应力腐蚀过程及机理。外加应力在η-Zn层中腐蚀坑应力集中部位诱发应力腐蚀裂纹，突破η-Zn层，并沿ζ-FeZn₁₃/η-Zn界面扩展，加剧镀锌层的电化学腐蚀过程。

关键词 ： Q235钢结构, 热镀锌层, 应力腐蚀, 显微组织, 腐蚀机理

Abstract：

The corrosion behavior of hot-dip galvanized coating on the Q235 steel plates commonly-used in grid equipment by applied bending stress was studied via immersion test in 0.05 mol/L NaCl solution while applied bending stress with a home-made three-point bending stress loading device. The results showed that by the applied bending stress, the corrosion of the hot-dip galvanized coating on Q235 steel plate was a process of repeated formation and spallation of corrosion products, of which the former involves apparently the occurrence of corrosion pits, while the later does not. The corrosion products were mainly composed of ZnO, Zn(OH)₂ and Zn₅(OH)₈Cl₂·H₂O. As the applied stress increased, the E_corr was decreased, but the I_corr and the electrochemical impedance were increased for the hot-dip galvanized coating on Q235 steel plate. A corrosion model was established to illustrate the corrosion process and the relevant mechanism for the corrosion of the hot-dip galvanized coating/Q235 steel plate. That is, the corrosion of the hot-dip galvanized coating was speeded by the applied bending stress to form more corrosion product Zn₅(OH)₈Cl₂·H₂O, which induced the formation of cracks at the stress concentrated sites beneath the corrosion product, i.e., the corrosion pits in η-Zn layer. The cracks then penetrated through the η-Zn layer, and extended along the interface ζ-FeZn₁₃/η-Zn. As a result, electrochemical corrosion of the galvanized coating was accelerated.

Key words： Q235 steel structure hot-dip galvanized layer stress corrosion microstructure corrosion mechanism

收稿日期: 2023-10-16 32134.14.1005.4537.2023.324

ZTFLH:

TG174.3

基金资助:国网安徽省电力有限公司科技项目(B3120522001G)

通讯作者: 汤文明，E-mail: wmtang69@126.com，研究方向为材料失效与可靠性评估

Corresponding author: TANG Wenming, E-mail: wmtang69@126.com

作者简介: 赵骞，男，1990年生，硕士，工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.324 或 https://www.jcscp.org/CN/Y2024/V44/I5/1305

图1 Q235钢板表面镀锌层截面形貌与应力腐蚀试样示意图

图2 三点弯曲应力加载装置示意图

图3 镀锌钢试样的拉伸应力-应变曲线

图4 镀锌钢试样在不同应力下0.05 mol/L NaCl溶液中浸泡144 h后的光学显微镜照片

表1 在不同应力下镀锌钢试样浸泡前后的重量及重量变化

图5 镀锌钢试样镀锌层在不同应力条件下浸泡后表面的XRD谱

图6 无应力下镀锌钢试样腐蚀层的表面形貌及微区EDS分析结果

图7 89 MPa应力下镀锌钢试样腐蚀层的表面形貌及微区EDS分析结果

图8 178 MPa应力下镀锌钢试样腐蚀层的表面形貌及微区EDS分析结果

图9 在不同应力条件下镀锌钢试样浸泡腐蚀后的截面形貌

图10 不同应力下镀锌钢试样浸泡腐蚀后的Tafel曲线

表2 由图10的极化曲线拟合得到的电化学数据

图11 不同应力下镀锌钢试样浸泡腐蚀后的EIS谱

图12 不同应力下镀锌钢试样浸泡腐蚀后的等效电路图

图13 Q235镀锌钢镀锌层应力腐蚀模型

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