Investigations on the Post-Annealing Adhesion Capability of Coated Electrical Steels

塗膜電磁鋼片退火附著性之研究

彭剛勇(Kang-Yung Peng)

《防蝕工程》 34卷4期 (2020/12) Pp. 33-46

https://doi.org/10.6376/JCCE.202012_34(4).0004

摘要

Electrical steels (ES) are the core for electrical motors, power generators, etc. To restore the electromagnetic property of ES after stamping, stress-relieving annealing is required. However, annealing can be very destructive to the insulation coating on ES and an inappropriate annealing usually results in coating adhesion failure, which badly affects the performance of ES facilities. Therefore, effects of the atmosphere in a practical (not absolutely air-tight) furnace on the post-annealing adhesion capability of ES coating were investigated to qualitatively reveal the influences of O_2, CO_2, H_2, and H_2O, respectively. The presence of CO_2 has little effect while both O_2 and H_2O can deteriorate the post-annealing adhesion capability. Contrarily, H_2 has protecting effects so that good post-annealing adhesion capability of coating can be fulfilled. Therefore, to ensure good post-annealing adhesion capability to the coating, minimal contents of oxygen and humidity in the furnace atmosphere is required and the presence of some hydrogen in the furnace atmosphere can be helpful.

關鍵字

Electrical steel ； Annealing ； Coating ； Adhesion ； Atmosphere