Abstract

High-strength bolt attachment parts of steel bridges are prone to corrosion at an early stage, and blast nozzles and power tools cannot be inserted due to the structural shape during repairs, and there are many cases where rust remains partially. To solve such a problem, the Cold Spray technology, which uses a powder that mixes zinc and alumina, exhibits corrosion resistance by depositing a film even if rust remains. In this paper, first the anticorrosion mechanism on the residual rust was examined by focusing on the permeation prevention of the corrosion factor of the Cold Spray anticorrosion film and the adhesion of the residual rust boundary. Findings indicate that the Cold Spray anticorrosion film exhibits a porosity approximately one-tenth that of films engendered via the thermal spraying method, thereby constituting a denser film with heightened environmental barrier attributes. The firm adherence of the Cold Spray anticorrosion film to the residual rust interface is explained by differences in hardness between Cold Spray, residual rust, and zinc. Furthermore, the physical characteristics of zinc undergo modifications influenced by the temperature environment during construction, imparting a plasticity to zinc on uneven rust surfaces.

中文翻译：

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腐蚀钢桥低压冷喷涂涂层的致密性和附着力

摘要

钢桥高强螺栓附着部位早期容易腐蚀，修复时因结构形状原因无法插入喷砂嘴和电动工具，局部锈迹残留的情况较多。为了解决这个问题，冷喷涂技术使用了锌和氧化铝混合的粉末，即使有锈迹，也可以通过沉积薄膜来表现出耐腐蚀性。本文首先从冷喷涂防腐膜腐蚀因子的防渗透性和残锈边界的附着力两个方面探讨了残锈的防腐机理。研究结果表明，冷喷涂防腐膜的孔隙率约为热喷涂法形成的膜的十分之一，从而构成更致密的膜，具有更高的环境屏障属性。冷喷涂防腐膜与残锈界面的牢固粘附是通过冷喷涂、残锈和锌之间的硬度差异来解释的。此外，锌的物理特性会受到施工过程中温度环境的影响而发生变化，从而赋予锌在不平坦的锈表面上的可塑性。