In recent years, the rapid development of railway transportation has driven the need for higher performance and more advanced design in locomotive and rolling stock manufacturing. As a result, the requirements for surface treatment and coating processes have become increasingly stringent. Traditional methods such as manual rust removal or chemical phosphating are no longer sufficient to meet the demands of modern steel structures. To address this, a new surface treatment and coating process was developed and tested at the Sifang Locomotive and Rolling Stock Factory Measuring and Physical Testing Center in Qingdao, Shandong.
This new method combines sandblasting with the application of a pre-coat primer, significantly improving the adhesion and durability of the final coating. The process involves first blasting the steel surface with angular sand to create a rough texture that enhances the contact area between the coating and the substrate. This is followed by the application of a magnet epoxy ester anti-rust paint as a pre-coat primer, which provides excellent corrosion resistance and ensures compatibility with subsequent layers.
The testing process involved preparing two groups of samples: one treated with sandblasting and the other not. Each group was coated with different layers of primer and evaluated for adhesion, salt water resistance, and overall compatibility. Results showed that the sandblasted samples with the pre-coat primer exhibited superior adhesion and corrosion resistance compared to those without sandblasting. Moreover, the compatibility between the pre-coat primer and the zinc phosphate polyurethane primer was excellent, with no signs of blistering or peeling.
This innovative process has been successfully implemented in several projects, including the Sri Lanka EMU models since 1999, with no reported quality issues. It has proven to be highly effective in meeting the design and production standards of modern railway vehicles, ensuring long-lasting protection and reliable performance under various environmental conditions. The adoption of this new process marks a significant advancement in the field of steel structure surface treatment and coating.
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