大跨径钢箱梁桥面锌系防腐蚀涂层研究  

Zinc-Based Anticorrosion Coatings for Steel Box Bridge Deck with Long Span

作　　者：沈承金[1] 明图章[2] 张健康[2] 胡光伟[2] 汪洋[1] 

机构地区：[1]中国矿业大学材料科学与工程学院,江苏徐州221008 [2]江苏省交通规划设计院,江苏南京210005

出　　处：《材料保护》2008年第8期58-61,共4页Materials Protection

基　　金：江苏自然科学基金(BK2005020);江苏省交通科学研究基金(06Y24)资助

摘　　要：钢桥面防腐蚀涂层介于钢箱梁桥面板与桥面沥青铺装层2种完全不同的材料之间,既是钢桥面的防腐蚀涂层、防水涂层,又是二者的连接层。因此,对该防腐蚀涂层的腐蚀失效问题及其对钢桥面沥青混凝土铺装层弱化的影响规律进行研究具有实际意义。通过电化学腐蚀试验、涂层结合力试验、XRD分析等方法,研究了在环氧沥青和改性沥青混凝土2种钢桥面铺装层下的无机富锌、环氧富锌和电弧喷锌涂层的腐蚀性能以及涂层与钢桥面板间结合性能,考察了涂层腐蚀对桥面铺装层抗剪切性能的影响。结果表明:喷锌防腐蚀涂层与桥面板之间的结合力受制于钢板除锈预处理方式,喷砂处理的涂层结合力优于抛丸处理;铺装层的抗剪切能力受防腐蚀涂层腐蚀产物影响,锌系涂层的可溶性腐蚀产物破坏了钢桥面铺装体系界面的连续性,锌系涂层腐蚀使铺装层抗剪切强度下降1倍左右,喷锌涂层腐蚀对铺装层结合性能的影响大于富锌涂料涂层。The anticorrosion coatings lying between steel box bridge deck and asphalt concrete paved layer act as anticorrosion and waterproof coatings of the steel bridge deck and the intermediate coatings of the bridge deck and paved layer,which makes it imperative to study the corrosion-induced failure of the coatings and its effect on the strength of the asphalt concrete paved layer on steel bridge deck.Thus electrochemical corrosion test,adhesion force test of the coatings,and X-ray diffraction analysis were carried out to investigate the corrosion behavior of inorganic zinc-rich coating,epoxy resin zinc-rich coating,and arc sprayed zinc coating.The adhesive strength between the coatings and the panel,and the effect of the corrosion of the coatings on the shear behavior of the paved layers including cast asphalt,thermal asphalt mortar,epoxy asphalt,and modified asphalt concrete were also examined.Results showed that the adhesive strength between the coatings and the bridge panel was dependent on the rust removing pre-processing mode,and the sandblast coating had stronger adhesion strength than the shot-peening coating.At the same time,the shear strength of the paved layer was affected by the corrosion products of zinc coatings,namely,the corrosion of the zinc-based coatings led to decrease of the shear strength of the paved layer by about 50%.And the arc sprayed zinc coating led to a larger decrease in the shear strength of the paved layer than the zinc-rich coatings.

关 键 词：钢桥面 防腐蚀 锌涂层 界面腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]