桥梁作为一种常见的交通基础设施,便捷了我们的生活,带动了国民经济的发展。但每年国内外都有报道桥梁倒塌事故的发生,不仅产生巨大的经济损失,同时给我们的生命安全造成严重的威胁。分析造成事故的原因可以得出:桥梁的腐蚀失效是其中...桥梁作为一种常见的交通基础设施,便捷了我们的生活,带动了国民经济的发展。但每年国内外都有报道桥梁倒塌事故的发生,不仅产生巨大的经济损失,同时给我们的生命安全造成严重的威胁。分析造成事故的原因可以得出:桥梁的腐蚀失效是其中一个重要因素。因此,如何解决桥梁的腐蚀问题已日渐成为其使用过程中不容忽视的一大难题,如何形成长效、绿色、环保的解决桥梁腐蚀情况的机制成为了国内外亟待解决的一大研究热点。本文分析了桥梁锚室、拉索等部位服役过程中的主要腐蚀因素及规律,简单阐述了目前应对桥梁锚室、拉索等部位腐蚀问题采取的防腐措施,最后提出两种新型桥梁防腐技术,分别为复层矿脂包覆防腐蚀技术(Petrolatum Tape and Covering system,PTC)和氧化聚合型包覆防腐蚀技术(Oxidation Tape and Covering system,OTC),并对两种技术的特点及应用情况分别做了具体阐述。展开更多
By laser multi-layer cladding using a pulsed Nd-YAG irradiation the thickness of the cladding zone Mg-based alloys(ZM2 and ZM5) can reach about 1.0 mm.The microstructure of the substrate and the cladding zone was stud...By laser multi-layer cladding using a pulsed Nd-YAG irradiation the thickness of the cladding zone Mg-based alloys(ZM2 and ZM5) can reach about 1.0 mm.The microstructure of the substrate and the cladding zone was studied using optical microscope, scanning electron microscopy(SEM), X-ray diffractometry(XRD) and micro hardness analysis. It is observed that constituent of ZM5 alloy is δ+Mg 17Al 12, that of ZM2 alloy is α+MgZn+Mg 9Ce. That of cladding layer ZM2 alloy(L-ZM2) is Mg+Mg 2Zn 11+MgCe; while that of the cladding layer ZM5 alloy(L-ZM5) is Mg+Mg 32(Al, Zn) 49. The hardness of the cladding area can be increased to values above HV127. Very fine uniform microstructure and the produced new phases of nanometer/sub-micrometer order were obtained. Now, many repaired Mg-based alloy components have been passed by flying test in outside field.展开更多
文摘桥梁作为一种常见的交通基础设施,便捷了我们的生活,带动了国民经济的发展。但每年国内外都有报道桥梁倒塌事故的发生,不仅产生巨大的经济损失,同时给我们的生命安全造成严重的威胁。分析造成事故的原因可以得出:桥梁的腐蚀失效是其中一个重要因素。因此,如何解决桥梁的腐蚀问题已日渐成为其使用过程中不容忽视的一大难题,如何形成长效、绿色、环保的解决桥梁腐蚀情况的机制成为了国内外亟待解决的一大研究热点。本文分析了桥梁锚室、拉索等部位服役过程中的主要腐蚀因素及规律,简单阐述了目前应对桥梁锚室、拉索等部位腐蚀问题采取的防腐措施,最后提出两种新型桥梁防腐技术,分别为复层矿脂包覆防腐蚀技术(Petrolatum Tape and Covering system,PTC)和氧化聚合型包覆防腐蚀技术(Oxidation Tape and Covering system,OTC),并对两种技术的特点及应用情况分别做了具体阐述。
文摘By laser multi-layer cladding using a pulsed Nd-YAG irradiation the thickness of the cladding zone Mg-based alloys(ZM2 and ZM5) can reach about 1.0 mm.The microstructure of the substrate and the cladding zone was studied using optical microscope, scanning electron microscopy(SEM), X-ray diffractometry(XRD) and micro hardness analysis. It is observed that constituent of ZM5 alloy is δ+Mg 17Al 12, that of ZM2 alloy is α+MgZn+Mg 9Ce. That of cladding layer ZM2 alloy(L-ZM2) is Mg+Mg 2Zn 11+MgCe; while that of the cladding layer ZM5 alloy(L-ZM5) is Mg+Mg 32(Al, Zn) 49. The hardness of the cladding area can be increased to values above HV127. Very fine uniform microstructure and the produced new phases of nanometer/sub-micrometer order were obtained. Now, many repaired Mg-based alloy components have been passed by flying test in outside field.
