镀锌钢在模拟广州地区大气环境中的室内加速腐蚀研究

doi:10.11901/1005.3093.2017.543

材料研究学报

2018, Vol. 32

Issue (8): 631-640 DOI: 10.11901/1005.3093.2017.543

研究论文

本期目录 | 过刊浏览

镀锌钢在模拟广州地区大气环境中的室内加速腐蚀研究

王劲¹, 黄青丹¹, 刘静¹, 张亚茹¹, 乔创², 郝龙³, 董俊华³(

), 柯伟³

1 广州供电局有限公司电力试验研究院广州 510410
2 河南农业大学林学院郑州 450002
3 中国科学院金属研究所材料环境腐蚀研究中心沈阳 110016

Accelerated Indoor Corrosion of Galvanized Steel in a Simulated Atmospheric Environment of Guangzhou Area

Jin WANG¹, Qingdan HUANG¹, Jing LIU¹, Yaru ZHANG¹, Chuang QIAO², Long HAO³, Junhua DONG³(

), Wei KE³

1 Electric power test and Research Institute, Guangzhou Power Supply Co. Ltd. (GZPS), Guangzhou 510410, China
2 College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
3 Environmental Corrosion Center of Materials, Institute of Metal Research,

引用本文:

王劲, 黄青丹, 刘静, 张亚茹, 乔创, 郝龙, 董俊华, 柯伟. 镀锌钢在模拟广州地区大气环境中的室内加速腐蚀研究[J]. 材料研究学报, 2018, 32(8): 631-640.
Jin WANG, Qingdan HUANG, Jing LIU, Yaru ZHANG, Chuang QIAO, Long HAO, Junhua DONG, Wei KE. Accelerated Indoor Corrosion of Galvanized Steel in a Simulated Atmospheric Environment of Guangzhou Area[J]. Chinese Journal of Materials Research, 2018, 32(8): 631-640.

全文: PDF(5189 KB) HTML

摘要:

采用室内干/湿交替模拟大气腐蚀试验方法(CCT)、腐蚀失重、扫描电子显微镜(SEM)、X-射线衍射(XRD)、拉曼光谱(Raman)等手段,研究了输电杆塔用热浸镀锌钢在模拟广州地区大气环境条件下的腐蚀动力学、产物形貌与结构、相组成等性质的演化。结果表明：在当前模拟条件下,单位面积镀锌钢在实验室120 cycles后的腐蚀失重量与广州地区实场曝晒6个月的腐蚀失重量相当;镀锌钢120 cycles的腐蚀过程分为两个阶段,初期腐蚀速率较大,锈层较薄、疏松、多孔、不连续、与基体结合不紧密;随着腐蚀周期的延长,腐蚀速率明显降低,锈层逐渐增厚、致密、完整连续、与基体结合紧密的内锈层逐渐形成。此外,镀锌钢大气腐蚀产物主要由ZnO、Zn(OH)₂、ZnCO₃、ZnSO₄、Zn₅(OH)₆(CO₃)₂、Zn₄(OH)₆SO_4·xH₂O、Zn₅(OH)₈Cl₂和Zn₁₂(OH)₁₅Cl₃(SO₄)₃等组成,但结晶度不高;随着腐蚀周期的延长,锈层中稳定性相Zn₄(OH)₆SO_4·xH₂O和Zn₅(OH)₆(CO₃)₂含量逐渐增多,不稳定性相Zn₁₂(OH)₁₅Cl₃(SO₄)₃含量逐渐减少。

关键词 ：材料失效与保护, 输电杆塔, 镀锌钢, 热镀锌, 大气腐蚀, 二氧化硫, 氯离子

Abstract：

The corrosion kinetics and corrosion product of galvanized steel, which is widely used for making power transmission tower, in a simulated atmosphere of Guangzhou area were investigated by means of wet/dry-cyclic corrosion test (CCT), scanning electron microscopy (SEM), X-ray diffractometer (XRD) and Raman spectroscopy (Raman). Results indicate that, under the present simulated conditions, the corrosion weight loss of galvanized steel after 120 cycles test by CCT is equivalent to that of the same steel exposed to the atmosphere at a designed test site at Guangzhou area for 6 months. The corrosion process of the CCT test can be divided into two stages, and the corrosion rate in the early corrosion stage is relatively higher and the corrosion product scale is thin, loose and porous with poor adhesion to the matrix. With the progress of corrosion, the corrosion rate decreases obviously, and the corrosion product scale gradually becomes thicker and compact with good adhesion to the matrix, while an inner rust layer emerges. In addition, the corrosion product of the Zn-coating consists of ZnO, Zn(OH)₂, ZnCO₃, ZnSO₄, Zn₅(OH)₆(CO₃)₂, Zn₄(OH)₆SO_4·xH₂O, Zn₅(OH)₈Cl₂, and Zn₁₂(OH)₁₅Cl₃(SO₄)_3, however, which present rather low crystallization degree. As the corrosion process proceeds, among others, the proportion of stable phases of Zn₄SO₄(OH)_6·xH₂O and Zn₅(OH)₆(CO₃)₂ increases, while that of the unstable phase of Zn₁₂(OH)₁₅Cl₃(SO₄)₃ decreases.

Key words： materials failure and protection electricity transmission tower galvanized steel hot-dip Zn coating atmospheric corrosion SO₂ Cl^-

收稿日期: 2017-09-13

ZTFLH:

TG146.2

基金资助:资助项目沿海大型城市复杂大气环境下输电线路杆塔腐蚀分布及防腐措施研究(GZM2014-2-0004)

作者简介:

作者简介王劲, 男, 1977年生, 高工

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	王劲
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	董俊华
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https://www.cjmr.org/CN/10.11901/1005.3093.2017.543 或 https://www.cjmr.org/CN/Y2018/V32/I8/631

表1 广州市降雨年平均数据分析结果

表2 室内加速腐蚀模拟溶液组成与来源

图1 实场曝晒条件下镀锌层厚度随曝晒时间的腐蚀减薄

图2 实验室模拟大气腐蚀条件下镀锌层厚度减薄与腐蚀速率随腐蚀周期的演化

图3 模拟大气腐蚀条件下镀锌钢腐蚀不同周期后的表面及截面SEM照片

图4 镀锌钢表面腐蚀产物形貌演化的SEM观察

图5 镀锌钢表面不同形状腐蚀产物的EDX谱

图6 不同腐蚀周期后镀锌钢表面腐蚀产物的XRD物相分析

图7 镀锌钢腐蚀120 cycles后表面腐蚀产物的Raman光谱表征

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