林学亮,王友彬,辛延琛,高锋,韦悦周,Toyohisa FUJITA.热浸镀锌层界面的微区电化学腐蚀行为[J].表面技术,2022,51(9):217-225.
LIN Xue-liang,WANG You-bin,XIN Yan-chen,GAO Feng,WEI Yue-zhou,Toyohisa，FUJITA.Localized Electrochemical Corrosion Behavior of the Interface of Hot-dip Galvanized Coating[J].Surface Technology,2022,51(9):217-225 |
| 热浸镀锌层界面的微区电化学腐蚀行为 |
| Localized Electrochemical Corrosion Behavior of the Interface of Hot-dip Galvanized Coating |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.022 |
| 中文关键词: 微区电化学 热浸镀锌 界面 扫描电化学显微镜 腐蚀行为 |
| 英文关键词:localized electrochemistry hot-dip galvanized interface scanning electrochemical microscopy (SECM) corrosion behavior |
| 基金项目:广西自然科学基金面上项目(2021GXNSFAA196046);国家自然科学基金(11975082) |
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| Author | Institution |
| LIN Xue-liang | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
| WANG You-bin | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
| XIN Yan-chen | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
| GAO Feng | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
| WEI Yue-zhou | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
| Toyohisa，FUJITA | Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China;School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China |
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| 中文摘要: |
| 目的 探究钢铁热浸镀锌的镀层/钢基体界面的微区电化学特性及腐蚀行为。方法 采用扫描电化学显微镜(SECM)分析技术，研究镀层/钢基体界面在0.1 mol/L NaCl溶液腐蚀过程中微区电流的演变过程，结合扫描电镜(SEM)、能谱仪(EDS)、3D显微镜以及X射线衍射技术(XRD)等分析腐蚀产物的物相组成与分布规律。结果 在腐蚀过程中，镀锌钢的腐蚀产物主要分布在热浸镀锌层界面处靠近钢基体的一侧，在镀锌层表面的分布较少，腐蚀产物主要由Zn5(OH)8Cl2、Zn5(OH)6(CO3)2与ZnO等物相组成。在腐蚀开始阶段，钢基体区域的SECM还原电流(I=1.2)大于镀锌层(I=1.1)。随着腐蚀时间的延长，镀层/钢基体界面处的SECM还原电流整体降低，同时在界面靠近钢基体一侧存在电流凹陷区(I=1.0)，表明腐蚀产物主要沉积在此处，并对镀层的腐蚀起到保护作用。此外，在腐蚀过程中氧气的消耗主要发生在钢基体区域，随着腐蚀时间的增加，镀层和钢基体表面的溶解氧含量都逐渐降低。结论 在浸泡腐蚀过程中，镀锌层作为阳极，溶解生成Zn2+，并向钢基体区域扩散，同时钢基体表面消耗氧气，还原形成OH–向镀锌层区域扩散。Zn2+与OH–以及溶液中其他离子结合，生成腐蚀产物，在靠近镀层/钢基体界面处的钢基体一侧沉淀，对钢基体起到一定的保护作用。 |
| 英文摘要: |
| This work aims to explore the localized electrochemical characteristics and corrosion behavior of the Zn coating/steel substrate interface of the hot-dip galvanized steel. The evolution of the localized electrochemical current of the Zn coating/steel substrate interface in the 0.1 mol/L NaCl solution is studied by scanning electrochemical microscope (SECM). The distribution and composition of corrosion products are analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), 3D microscopy, and X-ray diffraction (XRD). In the corrosion process, the corrosion products are mainly distributed on the surface of the steel substrate close to the interface of coating/steel substrate, and the corrosion products are less distributed on the surface of Zn coating. XRD results show that the corrosion products are mainly composed of Zn5(OH)8Cl2, Zn5(OH)6(CO3)2 and ZnO. The SECM reduction current of the steel substrate (I=1.2) is larger than that of the Zn coating (I=1.1) at the beginning of corrosion, and the whole reduction current of the Zn coating and steel decreases with the prolonging of corrosion time. There is a current depression area (I=1.0) on the steel substrate close to the interface, indicating that the corrosion products are mainly deposited in this area and play a protective role in the steel corrosion. In addition, oxygen consumption mainly occurs on the steel substrate area during the corrosion process. With the prolonging of corrosion time, the dissolved oxygen content on the coating and steel substrate gradually decreases. During the process of immersion corrosion, the Zn coating acts as an anode, dissolving to generate Zn2+ and spreading to the steel substrate area. At the same time, the OH－forms on the surface of the steel substrate by the oxygen reduction, and diffuses to the Zn coating area. Zn2+ combines with OH－and other ions in the solution to form corrosion products, which will deposit on the steel substrate near the interface of coating/steel substrate, and play a protective role in the steel substrate. |
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