文献类型：期刊文献

英文题名：Failure analysis of microcracks formation and expansion in nickel plated pure iron riveting of relays

作者：Li, Qin Wang, Qiang Shi, Lei Yang, Xiufu Ma, Xing Xiao, Huayu Lin, Wenhai

第一作者：李琴

通信作者：Lin, WH[1]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang, Guizhou, Peoples R China;[2]Guizhou Zhenhua Qunying Elect Co Ltd, State Owned Factory 891, Guiyang, Guizhou, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang, Guizhou, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2026

卷号：184

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20254819581613);WOS:【SCI-EXPANDED(收录号:WOS:001629354200001)】；

基金：This work was respectively supported by Guizhou Provincial Basic Research Program (Natural ScienceProgram) (Qiankeheji-ZK [2024] General517) , Guizhou Institute of Technology High-level Talent Scientific Research Fund Launch Project (2023GCC022) , Guizhou Institute of Technology High-level Talent Scientific Research Fund Launch Project (2023GCC026) , The Young Scientific and Technological Talents Growth Project of Department of Education of Guizhou Province (Qianjiaohe KY [2022] 353) ,The Teaching Reform Research Project of Guizhou Institute of Technology (2022TDFJG04) .

语种：英文

外文关键词：Eletromagnetic relay; Iron core; Riveting; Microcracks mechanism; Nickel plating layer

摘要：For a long time, researchers have been focusing on the mechanism of occasional cracking in nickel plating layers in order to take effective preventive measures to avoid its occurrence. However, existing theories cannot explain the phenomenon of occasional microcracks appearing in the nickel plating layer of relay cores after riveting. Our team, through years of research on critical processes such as heat treatment, nickel plating, and chemical polishing, proposed a mechanism for the generation and propagation of microcracks in nickel plating core riveting: the chemical nickel plating layer grows along the surface crystal orientation; after riveting, the tearing degree increases under pressure, and pure iron fails to completely fill the tear gaps in the nickel layer, resulting in visible cracks during visual inspection. Guided by this theory, we manufactured and screened dozens of relay batches using improved processes, and no recurrence of the nickel plating layer cracking was found, thus systematically solving this persistent challenge in the miniature relay industry. This research not only theoretically explains the cause of occasional cracking in nickel plating layers but also provides a theoretical basis for subsequent preventive measures.