大型钢结构桥梁工程腐蚀防护的涂装工艺及质量控制

针对目前长效防腐涂装行业存在质量问题,详细介绍了钢结构桥梁工程腐蚀防护的涂装工艺及质量控制手段,期望本标准工艺能对当前涂装施工企业提高涂装质量有所裨益。     

焦化厂钢结构涂层的失效及重涂

为解决某焦化厂钢结构涂层失效的问题,现场调查了环境腐蚀因素、原防护措施及其失效状况。厂区存在硫化物、氮化物、粉尘等污染物,在原防护施工中存在基材表面除锈不彻底、涂料种类搭配不合理、维护周期不合理、涂层厚度不达标等问题。通过制定适合该焦化厂各区域腐蚀环境特点的涂装方案,并在涂装环节严格控制施工质量,可解决原钢结构涂装防护层提前失效的问题。     

涂装前钢材表面处理标准的修订

涂装前钢材表面锈蚀等级和除锈等级标准,是钢结构腐蚀防护涂装的行动指南。随着技术的飞速发展,标准修订已提上议事日程。分析了部分钢结构标准中出现的问题,以及原标准的不足之处,供修订时参考。     

重防腐蚀涂料的涂装设计和应用

阐述了钢结构的腐蚀与防护,并对重防腐蚀涂料涂装设计方法进行了探讨,介绍了环氧型等重防腐蚀涂料的应用实例。     

国内外行业动态

全国钢结构防腐蚀与涂装技术研讨会在哈尔滨召开由中国腐蚀与防护学会建筑工程专业委员会、北京腐蚀与防护学会联合召开的“全国钢结构防腐蚀涂装技术专题研讨会”日前在哈尔滨汇融大厦召开。大会交流论文15篇,内容涉及钢结构防腐和涂层配套体系以及应用实例、集装箱涂装技术、当前我国防腐涂装工程若干问题等。第六届全国石油和化工行业优秀期刊颁奖大会在海拉尔召开由中国化工情报信息协会主办的“第六届全国石油和化工行业优秀期刊颁奖大会暨中国化工情报信息协会信息与刊物分会三届二次理事会8月25日-29日在海拉尔召开。来自石油和化工…     

散粮泊位码头室外钢结构涂装失效分析

介绍了某港区散粮泊位码头钢筒仓室外钢结构防护涂装工程竣工1a后即出现大面积早期泛锈、涂层起泡和涂层脱落等现象。通过现场勘查,采用宏观、微观观察和涂层附着腐蚀物无机盐含量分析等方法进行了涂层失效分析。结果表明,涂装预处理不当、涂层涂装控制不当以及焊接缺陷和焊缝处理不当等是造成钢结构涂装质量事故的的主要原因。     

钢结构建筑工程的防护涂装

简单介绍了建筑钢结构的特点和类型,并主要对建筑钢结构的防护涂装设计做了阐述。同时对建筑钢结构防护涂装体系的常见问题做了探讨。     

国内外专家“会诊”跨海大桥防腐难题

10月24日在华东理工大学，300多位国内外专家学者研讨了“现代跨海桥梁结构百年防腐技术问题”。会上，国内外专家针对跨海大桥结构防腐进行了交流。大家就“百年大桥——东海大桥的防护体系”、“海湾大桥的防护控制”、“钢铁设施在海洋浪花飞溅区腐蚀行为及其防护技术”、“钢结构桥梁防护涂料与涂装”、“海湾大桥腐蚀防护国内外进展”。     

用防火涂料筑牢钢结构建筑的消防安全防火墙

正众所周知,钢结构是以钢材制作为主的结构。钢结构建筑一般是由型钢和钢板等制成的钢梁、钢柱、钢桁架,是主要的建筑结构类型之一。钢结构防腐蚀涂装是利用涂层的保护作用,防止钢结构腐蚀,延长其使用寿命。由于钢结构的耐腐蚀性差,必须定期采取防护措施,防止钢材腐蚀生锈,而涂刷钢结构防锈漆正是对钢材进行维护的一项必要措施。防火涂料     

ISO 12944钢结构防护涂料系统的防腐蚀保护

介绍了ISO 12944的主要内容,着重于对腐蚀环境分级,不同的防护期和相应的漆膜厚度的说明。以体育场馆的钢结构为例,说明了如何利用ISO 12944来配套防腐蚀涂装体系。     

重防腐涂料施工推荐方案

对适用于埋地管道和架空管道的重防腐涂料的涂装工艺流程以及普通钢材、铸铁和镀锌钢材的埋地管道、无保温层架空管道和有保温层架空管道的防腐配套方案分别进行了介绍。对其表面处理和涂装环境要求、油漆调配、施工、涂层检验以及钢结构件耐高温重防腐涂料涂装方法等进行了说明。指出了各环节注意事项。     

跨海大桥钢结构防腐涂料设计方案

介绍了跨海大桥钢结构防护涂层(包括防锈底漆、中间漆和面漆)的选择标准、原则以及主桥钢箱梁热喷涂防腐蚀涂层体系和热喷涂锌、铝涂层钢铁防护标准.通过实例说明了跨海大桥钢箱梁防腐涂料体系设计方案及其涂装注意事项.论述了钢丝主缆涂装工艺及钢质护栏内、外表面防腐涂装方案.     

工程车活塞杆用45~#钢电沉积Ni-WC纳米复合镀层的研究

在工程车活塞杆常用材料45#钢表面电沉积Ni-WC纳米复合镀层。分析了纳米复合镀层的表面形貌和物相结构,测试了纳米复合镀层的耐磨性和耐蚀性,并与45#钢的性能做比较。结果表明:纳米复合镀层表面较平整、均匀,结构较致密,主要由Ni相、WC相组成,Ni相的质量分数为81.25%,WC相的质量分数为6.53%,孔隙率低于0.5%,平均摩擦因数约为0.28;相同条件下,纳米复合镀层的腐蚀速率低于45~#钢的;纳米复合镀层能够提供有效的磨损防护和腐蚀防护,提高45~#钢的耐磨性和耐蚀性。     

Effect of Al on the galvanic ability of Zn-Al coating under thin layer of electrolyte

The effect of Al on the galvanic ability of Zn-Al coating has been studied under thin electrolyte layers by measuring surface potential and surface pH. The changes of surface potential and surface pH over Zn-Al/steel galvanic couple corroding in artificial sea water (ASW) were measured at 60% and 90% RH at 298 K. In the initial stage of corrosion, Zn-55Al coating has shown better galvanic protection ability than Zn-5Al coating in both 60% and 90% RH. However, Zn-5Al coating was better in long term corrosion. The better galvanic ability of Zn-55Al coating in the initial stage of corrosion was related to the observation of pH as low as low as 2 on its surface. The low pH value was due to hydrolysis of Zn²⁺ and Al³⁺ ions. The low pH value was further confirmed by observing evolution of gas due to H⁺ reduction on the Zn-55Al coating. With the progress of corrosion, the low pH region of coating layer extended towards the base steel. This helped expand the deposition of zinc corrosion products on the steel surface. The enhanced dissolution of zinc in Zn-55Al coating led to the formation of a barrier layer which limited the galvanic protection of remaining steel. This was not the case in Zn and Zn-5Al coating. The X-ray analyses of the corroded samples have shown the deposition of zinc corrosion products on the steel surface, which greatly depended on the RH value. The part of the steel surface covered with zinc corrosion products has shown relatively less noble potential than other part indicating that zinc corrosion products took a role to protect the base steel against corrosion. The results from surface potential and surface pH measurements were substantiated by the surface observation of the corroded sample during and after the corrosion test.     

TiCN and metallic coatings for corrosion protection of separator plates in MCFCs

Stainless steel 304 substrates were coated with different materials in order to find a suitable coating material for corrosion protection of separator plates in molten-carbonate fuel cells (MCFCs). Five titanium carbonitride coatings differing in composition and morphology and a titanium monoxide coating were deposited with chemical vapour deposition techniques. Also double-layer coatings of TiN/Au and TiN/Ni were prepared. The coatings were tested on their corrosion protection of separator plates in four different environments: under MCFC-cathode or anode gas, at load or at open circuit conditions. The corrosion behaviour was characterized using cyclic voltammetry. Corrosion rates were determined with electrochemical methods and cross-section analyses of corrosion layers. Titanium nitride coatings showed the best corrosion protection. The titanium carbide and titanium monoxide coating showed respectively less and no protection. The thin gold and Ni-coatings were unstable. Under cathode gas, the most important corrosion protection is given by keeping the cell at load, and then a titanium nitride coating might provide lifetime protection. Under anode gas, corrosion is most severe at load conditions. A titanium nitride coating also gives corrosion protection, but not enough for lifetime protection.     

海工装备用Q390E钢表面腐蚀防护实验研究

鉴于海工装备用Q390E钢的耐蚀性不理想,对其进行表面处理,在其表面制备Ni-SiO2纳米复合镀层。对Ni-SiO2纳米复合镀层的表面形貌、耐蚀性及腐蚀形貌进行了测试与分析。结果表明:与Q390E钢相比,Ni-SiO2纳米复合镀层表面更为平整,表面粗糙度降低21.2%,相同实验条件下腐蚀率明显降低,表面发生均匀腐蚀,腐蚀程度轻。Ni-SiO2纳米复合镀层的耐蚀性优于Q390E钢的耐蚀性,能起到腐蚀防护作用,提高Q390E钢的耐蚀性。     

海南国际会展中心钢结构涂层防腐配套方案设计

介绍了海南国际会展中心钢结构所处的腐蚀环境──C5-M,论述了钢材结构形式对其防腐蚀设计的影响。根据ISO12944:2007标准和ISO2808:1997标准,设计了4种防腐蚀涂层配套方案,即室内、外钢结构防腐涂层体系和有防火功能的室内、外钢结构防腐蚀涂层体系。介绍了涂装技术条件、工艺流程和漆膜质量评定方法。     

Encapsulation of aliphatic amines into nanoparticles for self-healing corrosion protection of steel sheets

A noble approach based on the encapsulation of corrosion inhibitors has been presented, which are capable of improving the active corrosion protection without negatively influencing the barrier properties of the coating layers. Polymeric nanocapsules loaded with six types of amine corrosion inhibitors were synthesized by multi-stage emulsion polymerization. Depending on the basicity and water solubility of amines, different amounts of releasable corrosion inhibitors were encapsulated into the polymer capsules. Encapsulated organic amines were generally well released under alkaline conditions, and linear amines were more easily released from inside capsules than branched ones. The nanocapsules were incorporated into the coating resin and were coated on cold-rolled steel sheets to investigate corrosion protection efficiencies. The corrosion inhibitive efficiencies of the nanocapsule-containing coating layers were evaluated by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). In this study, it was revealed that the intrinsic properties of the amines as well as their encapsulation/release behaviors determined the barrier property and self-healing protection capability of the coating layer.     

耐热,耐油防腐涂料的研制

研制成耐热、耐油防腐涂料。该涂料是以生漆为主要原料,经改性,拼入多种颜填料配制而成,解决了热油介质下热交换器的防腐。阐述了漆酚甲醛树脂和环氧有机钛改性漆酚甲醛树脂的制法,以及涂料的配制。列举了该涂料的物理机械性能和耐化学品性能指标。讨论了影响涂层性能的因素。