Author(s)

Motoki Kuratani¹, Kenji Yamakawa², Ryuji Kurono³, Yuma Kano¹, Takato Sasaki¹, Yutaka Yamada^1,4, Osamu Sakurada^1*

¹Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu-shi, Gifu, Japan.
²Daiwa Inc., Kakamigahara-shi, Gifu, Japan.
³Tsutsui Industries, Handa-shi, Aichi, Japan.
⁴Daiwa Techno Co., Ltd., Gifu-shi, Gifu, Japan.

Steel structures are often painted to protect against corrosion. Repainting is one of the most important factors in maintaining the corrosion protection function of the coating. Various factors affect the life of the coating film, such as the surface preparation, the type of coating, and the number of coats. Surface preparation is important for the life of the coating film. However, appropriate surface treatment is difficult due to the complex shape of perforated panels, and it has been confirmed that corrosion progresses from the machined area. Therefore, appropriate pretreatment of the machined area is important for corrosion prevention. In this study, we investigated the effects of the repainting process on the atmospheric corrosion behavior of perforated panels. To reproduce the repainting process, a number of pretreatments were performed, such as salt spraying, blasting, and zinc phosphate treatment. In the salt spray test after pretreatment and painting, the corrosion progressed in cases with no zinc phosphate treatment and those left untreated for 48 h before painting. In addition, the coating film on the processed area was confirmed to be thin. These results suggested that appropriate pretreatment and sufficient thickness of the coating on the machined area would affect the occurrence of corrosion.

Repaint, Perforated Panel, Pretreatment, Machined Area, Painting Thickness

Kuratani, M. , Yamakawa, K. , Kurono, R. , Kano, Y. , Sasaki, T. , Yamada, Y. and Sakurada, O. (2021) Effect of Repainting Process on Atmospheric Corrosion Behavior of Perforated Panel. Materials Sciences and Applications, 12, 534-541. doi: 10.4236/msa.2021.1211035.