Microscopic Study on the Blister Formation Mechanism in Electrogalvanized Steel

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-06-27 DOI:10.1007/s12540-024-01723-8

Sang-Hoon Shin, T. T. T. Trang, Bong-Hoon Chung, Yong-Gyun Jeong, Jae-Sang Lee, Yoon-Uk Heo

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Abstract

The blister formation mechanism in electrogalvanized steel was studied by analyzing the blister’s internal structure. Electrochemical hydrogen charging was employed to absorb hydrogen into the steel plate and to induce blister formation. Analysis of the blister interior revealed that the initial formation of blisters occurred at the cracks located at the interface between the zinc layer and the steel substrate. These cracks originated from the steel substrate’s intergranular fracture or carbon contaminants’ adsorption on the steel surface. Grain boundary precipitates in hot-rolled plates form the intergranular crack after cold-rolling. A hydrogen anion was found inside the blister formed at the pre-existing intergranular crack. However, methylidyne (CH⁻) and methylene anion (CH₂⁻) dissociated from methane, as well as hydrogen anions were detected inside the blister formed at the carbon-contaminated steel surface. Methane gas is generated by the combination of absorbed hydrogen with carbon inside the crack. This research clarifies the detailed formation mechanism of blisters in electrogalvanized steel.

Graphical Abstract

Abstract Image

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电镀锌钢中水泡形成机理的显微研究

通过分析水泡的内部结构，研究了电镀锌钢板中水泡的形成机理。采用电化学充氢方法将氢气吸收到钢板中，诱导水泡的形成。对水泡内部结构的分析表明，水泡最初是在锌层与钢基板之间的界面裂缝处形成的。这些裂缝源于钢基体的晶间断裂或钢材表面的碳污染物吸附。热轧板中的晶界析出物在冷轧后形成晶间裂纹。在已经存在的晶间裂纹处形成的水泡内发现了氢阴离子。然而，在碳污染钢表面形成的水泡内检测到了从甲烷中离解出的甲基乙炔（CH-）和亚甲基阴离子（CH2-）以及氢阴离子。甲烷气体是由裂缝内吸收的氢与碳结合产生的。这项研究阐明了电镀锌钢中水泡的详细形成机制。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.