近年来部分工程案例显示环氧富锌涂层在钢桥面防护效果不理想，尤其是在南方沿海的大跨径钢桥面防护中会过早发生腐蚀破坏，主要原因是富锌涂料中的锌粉在高湿热、高温环境下与水气反应而失效，另一方面富锌涂料颜料体积浓度（ PVC）高，脆性大，渗透能力弱，在车载压力下容易与基材、中间层滑移等。本文采用韧性环氧树脂、增韧剂、柔性固化剂制备了一种高韧性非锌环氧重防腐涂料，通过拉伸试验、耐热盐水浸泡试验、盐雾试验、高温附着力等方法研究了其力学性能和防腐性能。结果表明，采用聚氨酯增韧改性环氧树脂 SLpu、低相对分子质量聚氨酯改性环氧树脂增韧剂 Dslu以及复配固化剂 [m（聚醚胺固化剂 T）∶m（柔性固化剂 F）=5∶1]制备的高韧性非锌环氧重防腐涂料拉伸性能、耐盐雾性能和耐热盐水性能优异，尤其是耐热盐水性能远超于环氧富锌涂料，更适合南方沿海高湿环境大跨径钢桥面铺装体系的防护，对解决目前钢桥面防护体系使用寿命不足的问题有一定的参考意义。

In recent years，some engineering cases showed that the protection effect of epoxy zinc-rich coatings on bridge deck was not ideal，especially premature corrosion damage would occur for long-span steel bridge deck in the south coast. The main reason is that the zinc powder fails due to the reaction with water and gas in high humidity and high temperature environment. On the other hand，the zinc-rich coating is prone to slip with substrates and intermediate layer under vehicle pressure for its high pigment volume concentration（PVC），high brittleness and weak penetration ability. In this paper，a high toughness non-zinc heavy-duty coatings was prepared using tough epoxy resin，toughening agent and flexible curing agent. Its mechanical and anticorrosive properties were studied through tensile tests，heat-resistant salt water immersion tests，salt spray tests and high-temperature adhesion tests. The results showed that the high toughness non-zinc heavy-duty coatings prepared by polyurethane toughened modified epoxy resin（SLpu）， low molecular weight polyurethane modified epoxy resin toughening agent（Dslu）and composite curing agent［m（polyether amine curing agent T）∶m（flexible curing agent F）=5∶1］had excellent tensile performance，salt spray resistance，and heat-resistant salt water performance. In particular，the heat saltwater resistant performance far exceeded that of epoxy zinc-rich coatings，making it more suitablefor the protection of long-span steel bridge deck pavement systems in southern coastal withhigh humidity environments. It has certain reference significance for solving the problem ofinsufficient service life of steel deck protection systems at present.