Abstract
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.
Highlights
We investigated the effects of the repainting process on the atmospheric corrosion behavior of perforated panels
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
These observations confirmed the usefulness of zinc phosphate treatment and it was suggested that the rust was removed by the process of zinc phosphate treatment
Summary
In the field of architecture, perforated panels, which are often used for the exterior walls of apartment buildings as well as corporate and social infrastructure facilities, are painted for protection against corrosion. In addition to their decorative purpose, perforated panels have advantages, such as providing shade from the sun, reducing noise, and saving energy [7] [8] [9]. In the painting of steel structures, especially in the repainting process, it is important to perform appropriate pretreatment before painting and to obtain a sufficient coating thickness on the machined parts
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