无机富锌涂层的诞生和应用

本文全面阐述了无机富锌涂层的研究、发展、特性和应用，指出无机富锌涂层具有杰出的耐环境侵蚀性、耐化学性、耐溶剂性、耐辐射性、耐热性，在恶劣腐蚀环境下它是钢结构件的最佳底涂层。     

无机富锌涂层的研究和发展

本文全面阐述了无机富锌涂层的研究、发展、特性和应用，指出无机富锌涂层具有杰出的耐环境侵蚀性能、耐化学性、耐溶剂性、耐辐射性和耐热性，在恶劣腐蚀环境下它是钢结构件的最佳底涂层。     

水性无机富锌涂料的防腐性能研究

无机富锌涂料具有杰出的耐侵蚀性能、耐溶剂性、耐辐射性、耐热性,在恶劣腐蚀环境下是用于钢结构件的最佳涂料之一。选取了几种具有代表性的水性无机富锌涂料进行研究,通过测试涂层的渗水性、抗盐雾性能、电化学保护性能,深入分析并比较了这几种水性无机富锌涂料防腐性能的优劣性。实验结果表明：GZH202型与FZ-1型无机富锌涂料具有较好的防腐性能,而LW-1型和IC531型水性无机富锌涂料的防腐性能相对较差。实验结果为进一步研究水性无机富锌涂料的使用提供了很好的参考价值。     

碳纳米管改性无机-有机水性富锌涂料的制备及其性能

在常见的水性无机硅酸盐富锌涂料中添加适量的硅丙乳液及碳纳米管,制成了无机-有机复合水性富锌涂料。对几种不同配比涂层的主要力学性能、电化学性能、耐盐雾性能及耐空蚀性能进行了测试分析,结果表明当硅丙乳液和碳纳米管分别占基料的20%和1%,颜基比为2:1时,涂料的基料稳定,喷涂粘度适中;同时涂层在保持了无机富锌涂料优异耐腐蚀性能的基础上,其耐空蚀性能也得到了很大提高。     

模数对水性硅酸钾富锌涂层电化学行为的影响

通过测量涂层腐蚀电位与涂层电化学交流阻抗,研究了水溶性K2SiO3溶液的模数(SiO2/K2O摩尔比)对水性无机富锌涂层电化学行为的影响.结果表明,水性无机富锌涂料随着水基模数的增加,涂层腐蚀电位增高,涂层对腐蚀介质的屏蔽性能增强,涂层中锌粉颗粒的活性溶解阻力增大.用扫描电子显微镜(SEM)观测不同模数水性无机富锌涂层的结构表明,水性无机富锌涂料水基模数的增加使涂层中锌粉颗粒之间充分交联,涂膜强度增大,涂层中锌粉颗粒之间的缝隙减小,涂层的致密性增强.     

无机富锌涂料用新型树脂在武汉开发成功

武汉现代工业技术研究院经过多年科技攻关成功开发出高模数纳米SiO2型无机富锌防锈涂料用树脂，用该树脂生产的无机富锌涂料在我国南海采油平台上五年多的实践证明，该无机富锌涂料质量达到进口同类产品水平，特别是耐盐雾性高达10000h，可与国际顶级的美国太空总署产品相媲美。     

氧化铝增强无机硅酸锌耐蚀抗磨涂层的研究

无机硅酸锌涂层常用于大型金属结构件的重防腐保护。文中对氧化铝增强无机硅酸锌涂层进行了研究，结果表明;在试验条件下，氧化铝增强无机硅酸锌涂层的耐蚀性提高了6倍；涂层的滑动摩擦因数为0．2左右，耐磨损性能提高了3倍。氧化铝增强无机硅酸锌涂层为钢铁材料表面的防护提供了新思路和新方法，具有广阔的应用前景。     

硅烷偶联剂处理对富锌涂层行为的影响

 采用测量涂层的腐蚀电位和电化学阻抗谱(EIS)等方法研究了硅烷偶联剂处理(钢铁表面的硅烷偶联剂预处理和富锌漆中掺入硅烷偶联剂)对富锌涂层在3.5mass%NaCl溶液中腐蚀行为的影响.结果表明，两种硅烷处理方式均明显延长了富锌涂层的阴极保护期.钢铁表面硅烷处理减弱了无机富锌涂层的阴极保护作用.      

无机富锌涂料在高纯氮罐内壁防腐中的应用

重点分析了无机富锌涂料在高纯氮气贮罐内表面防腐中应用的可行性，并列举了该涂料在这方面的应用实例。在钢制高纯氮气贮罐内表面的防腐中，岢采用无机富锌涂料，制备无机保护涂层。     

无机富锌涂料用新型树脂在武汉开发成功

高模数纳米SiO2型无机富锌防锈涂料用树脂已研制成功，用该树脂生产的无机富锌涂料在我国南海采油平台上5年多的应用证明，质量达到进口同类产品水平，特别是耐盐雾性高达10000h。使用该涂料时，可在钢铁表面形成硬度高达5H、附着力一级的无机硅酸锌防锈涂膜。该产品属绿色环保产品，适用于海上勘探和采油平台、港湾码头设施、桥梁、船舶、钢结构建筑、     

Zn粉含量及表面沾污对环氧富Zn漆电化学行为的影响

采用腐蚀电位、电化学阻抗谱(EIS)评价了Zn粉含量以及涂层／基体界面污染程度对环氧富Zn涂层的防腐蚀性能的影响并探索了富Zn涂层的失效机制。实验结果表明，当涂层中Zn含量较少时，Zn粉没有有效的阻挡作用。通过对可能的阻抗模型的分析，认为富Zn涂层的电化学阻抗谱的低频段是由Zn^2 从金属表面穿过腐蚀产物的扩散控制。涂层／基体界面污染不仅影响了环氧富Zn涂层的防腐蚀性能的发挥，也加速了钢铁基体的腐蚀。     

多道富锌基涂层在NaCl溶液中的电化学行为研究

多道富锌基涂层的电化学行为研究表明,涂层中的Zn粉未表现出明显的阴极保护作用,即使在富锌涂层上覆盖几个微米厚的环氧清漆涂层, Zn的阴极保护作用也会变得非常微弱. Zn粉对钢铁的保护作用在于Zn粉腐蚀产物对涂层的“自修复能力”.在环氧清漆覆盖条件下,无机富锌涂层中Zn粉的反应活性比有机富锌涂层中Zn粉的高,即Zn粉的反应速度更快.     

聚氨酯增韧环氧富锌涂料的制备及性能研究

目的增强环氧富锌涂层的韧性。方法利用末端带有环氧基的聚氨酯作为增韧剂,将其添加到环氧富锌涂料中,研究增韧剂的种类、添加量对富锌漆膜性能的影响,同时研究锌粉含量对漆膜性能的影响。结果增韧剂的添加提高了富锌漆膜的附着力、柔韧性和耐冲击性能,但使漆膜的耐水、耐盐雾性能稍微下降。结论当添加占树脂质量15%的聚氨酯时,含78%~85%锌粉(质量分数)的富锌涂层都能保持良好的力学性能。     

江苏LNG外输管道工程管线桥防腐管预制施工工艺改进

江苏LNG外输管道工程管线桥防腐管外防腐层采用环氧富锌底漆、环氧云铁中间漆、耐候氟碳面漆三层结构复合涂层.外防腐涂层的质量直接关系到天然气管道的长期有效安全稳定运行,也决定着管线的使用年限,而不同的外防腐施工工艺直接决定着涂层的质量和工期.作者在江苏LNG外输管道工程管线桥防腐管道施工过程中,对施工中存在的一些问题进行...     

一种高分散性富锌漆的制备及性能研究

目的 提高锌粉在富锌漆中的分散性。 方法 利用硅烷偶联剂 KH550 与过量环氧树脂 E-44 反应制备长链分散剂,之后与锌粉砂磨接枝,制得高分散性锌浆液;以有机膨润土与气相二氧化硅作为防沉剂,在二甲苯+正丁醇混合溶剂中高速分散后,加入改性锌浆和其它助剂,高速搅拌制得富锌漆 A 组份;B组份为聚酰胺 650 固化剂。 将 A,B 组份混合,制备涂层,测试涂层的性能。 结果 加入分散剂后,漆膜附着力由不加分散剂时的 2 级升高到 1 级,柔韧性由 3 mm 减小为 2 mm,抗冲击性能由 30 kg·cm 提高到 50kg·cm,电化学阻抗性能提升 1 倍以上。 结论 由高分散性涂料制备的富锌涂层具有良好的综合性能。     

Case study: Analysis of coating failure on hinged steel boxes

A systematic failure analysis was performed on three large steel boxes in which the coating system had blistered, extensively delaminated, and subsequently corroded. These boxes were a sample from a larger batch of boxes that had been recalled due to severe corrosion.Despite the fact that limited information on the process history was provided, we were able to determine that two out of three boxes were neither galvanized nor protected by a zinc-rich primer to provide cathodic protection. The coating system comprised an epoxy primer, zinc-rich intermediate coat followed by an acrylate urethane top coat. A zinc-rich coating should never be applied over a nonmetallic coating because cathodic protection of the underlying steel can only take place if the zinc-rich coating is in direct electrical contact with clean steel.The third box was galvanized and primed with a urethane-alkyd primer followed by an acrylate urethane top coat. Alkyd-type coatings should not be applied over zinc (galvanizing) because the corrosion products of zinc are alkaline. Alkyd-modified coatings are very sensitive to alkalinity and a saponification reaction occurs at the zinc-alkyd interface. This degrades the alkyd and causes it to peel or delaminate from the zinc alloy used for the galvanization.The epoxy primer showed unusually severe air bubbles (or pockets) that could have been due to saponification and/or solvent entrapment. In either case, these large pockets weakened the bond between the primer and galvanized layer and allowed delamination to occur.Our finding that chlorides were present on the surface of the epoxy primer indicated that the boxes might have been exposed to a marine or coastal atmospheric environment. Marine or coastal atmospheric corrosion is generally considered to be one of the most severe atmospheric corrosion environments and the presence of chlorides explains the severity of the corrosion.The boxes were presumed to have been powder coated, yet microscopic and chemical analysis showed the coatings were probably applied as liquids. This was further supported by the thinning of the coatings at the sharp edges and corners of the boxes.     

An electrochemical study of zinc-containing epoxy coatings on mild steel

A comparative electrochemical study has been carried out between conventional zinc-rich and novel zinc-containing paints. To study the cathodic protection performance of these coatings an assessment method based on a galvanic couple was employed. Current and potential were monitored with immersion time in 3.5% NaCl. The zinc-rich paint offered cathodic protection for about 7 days compared with 40 days for the new paint. However, the steel coupled with the zinc-rich remained corrosion free for a further period. This was probably due to the inhibitive effect of zinc salts deposited at the cathode. Thereafter a reversal in polarity was obtained once rust formed. Thus it is concluded that established cathodic protection criteria cannot be solely used to assess the protection properties of zinc-containing paints. Electrochemical impedance spectroscopy was also used to study the state of the coating with time. Diffusion parameters indicated that the new paints were covered with a lesser amount of corrosion products.     

Influence of surface roughness on performance of zinc-rich paint coatings

The influence of surface roughness on the performance of zinc-rich paint(ZRP) coatings was studied.Electrochemical impedance spectroscopy(EIS) measurements were used to assess the corrison prevention performance of the ZRP coatings.Furthermore,the EIS data of the steel-ZRP-sea water system were interpreted according to equivalent circuit models and the corresponding parameters were derived to assess the coating deterioration with time.The results show that the rougher surface favors better protection effect of the ZRP coatings.The protection potential of ZRP coatings for the standards and codes of practice is -0.78V(vs SCE).     

上海铁路南站大型钢结构工程的涂装防护

介绍了上海铁路南站大型钢结构工程的涂装设计,并介绍了水性硅酸锂富锌底涂料、环氧封闭涂料、环氧云铁中间涂料、可覆涂性聚氨酯丙烯酸面涂料等相容涂料于工程中的涂装概况。