DEMONSTRATION OF LONG-TERM CORROSION RESISTANCE OF COLD SPRAY TECHNOLOGY APPLIED TO ANTI-CORROSION REPAIR OF STEEL BRIDGE GIRDER ENDS

Abstract

 The ends of steel bridge girders are prone to significant corrosion at an early stage, and the development of highly durable anti-corrosion technology is necessary to ensure safety and security. To address this issue, the authors developed a corrosion repair technology using cold spray technology and conducted test applications on the girder ends of actual bridges where corrosion damage had occurred. In this paper, through continuous observation of the corrosion environment of actual girder ends over a 100-month period, the authors focused on the edges, which are weak points in painting, and demonstrated the long-term corrosion resistance of cold spray corrosion protection technology. As a result, it was proven that even on component edges where rust remained after simple surface preparation, a high-purity zinc coating could be applied and adhere to the surface during on-site construction, ensuring long-term corrosion resistance even in environments where corrosion is likely to occur, such as at the ends of girders.