The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

Electrochemical impedance spectroscopy (EIS) in the l00 kHz-10 mHz frequency range was employed as the main electrochemical technique to study the corrosion protection behaviour of zinc rich epoxy paint in 3% NaCl solution. The EIS results obtained at the open-circuit corrosion potential have been interpreted using a model involving the impedance of particle to particle contact to account for the increasing resistance between zinc particles with immersion period, in addition to the impedance due to the zinc surface oxide layer and the electrical resistivity of the binder. Galvanic current and dc potential measurements allowed us to conclude that the cathodic protection effect of the paint takes some time to be achieved. The loss of cathodic protection is due to a double effect: the decrease of the Zn/Fe area ratio due to Zn corrosion and the loss of electric contact between Zn to Zn particles. Even when the cathodic protection effect by Zn dust become weak, the substrate steel is still protected against corrosion due to the barrier nature of the ZRP film reinforced by Zn.

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 corrosion 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 -0.78 V(vs SCE).

石墨烯改性水性环氧富锌防腐涂层的制备及耐蚀性研究

[目的]将石墨烯(GE)作为改性剂引入水性环氧富锌(ZRE)涂层之中,探讨不同锌含量下添加石墨烯对其力学、电学及防腐性能的影响。[方法]通过划格附着力和耐冲击性测试考察了涂层的力学性能,根据表面电阻率、体积电阻率、吸水率和中性盐雾测试结果来评价石墨烯改性水性环氧富锌涂层的防腐效果。[结果]随着锌粉含量的增加,引入少量石墨烯能明显提高涂层的导电性和耐蚀性,但添加过多会导致涂层性能变差。综合力学、电学和耐腐蚀性能得出在锌含量70%的水性环氧富锌涂层中加入约0.9%的石墨烯效果最好。[结论]石墨烯添加量增大而导致的腐蚀微电池增多是涂层防腐蚀性能下降的主要因素,明确涂层中石墨烯与锌、铁之间的共存关系有望进一步提升水性环氧富锌涂层的综合性能。

抗腐蚀蔓延水性环氧富锌涂料的制备与性能

[目的]要延长涂层的使用寿命,需阻止腐蚀介质沿着涂层被划伤的部位侵入而腐蚀金属基材,抑制腐蚀蔓延。[方法]选用环氧树脂乳液、胺类固化剂、颜填料、腐蚀抑制剂及其他助剂制备了一种具有优异抗腐蚀蔓延能力的水性环氧富锌涂料,讨论了成膜物质含量、固化剂种类和颜填料复配形式对涂层耐蚀性的影响,探讨了涂层抗腐蚀蔓延的机理。[结果]在成膜物质的质量分数为15%,选用聚酰胺固化剂,以绢云母、超磷锌白和石墨烯作为颜填料,并加入适量腐蚀抑制剂的情况下,所制备的涂料综合性能最好,其涂层经中性盐雾试验2 160 h后依然具有良好的附着力,平均扩蚀宽度仅为1.43 mm。[结论]腐蚀抑制剂对涂层湿态附着力的提升,以及石墨烯对锌粉利用率的提升,共同赋予了该涂层优异的抗腐蚀蔓延性能。

南沙大桥钢桥面铺装防腐层施工工艺

为指导钢桥面防腐层施工,通过钢桥面板喷砂除锈及环氧富锌漆施工工艺研究,确定了喷砂除锈和环氧富锌漆施工关键技术控制指标,研究表明,抛丸机采用丸砂比为2∶1时,行走速度不得>3.0 m/min;采用喷枪喷涂环氧富锌漆,漆膜厚度均匀性要优于人工滚涂,且合格率相对较高;喷枪喷涂和人工滚涂环氧富锌漆对其拉拔强度影响不大。通过防腐层施工工艺研究,验证了防腐层施工关键技术与工艺的合理性。

市区跨江桥梁钢结构防腐涂装更新施工工艺

随着使用年限增长,市区桥梁钢结构防腐能力的恢复和更新,是桥梁维修的一项重要工作。该文研究了市区跨江桥梁钢结构,其具有性能良好的铝锌底涂层,复合涂装中的中漆层和面漆层老化。经过分析研究、试验段验证,得出最佳的维修涂装方案,既保护原有铝锌底涂层,又恢复桥梁钢结构的防腐性能。

Electrochemical behavior of organic and inorganic zinc-rich coatings in 3.5% NaCl solution

Performance comparisons between organic and inorganic zinc rich paints (ZRPs) were carried out. Electrochemical impedance spectroscopy (EIS) measurements were used to assess the corrosion prevention performance of the ZRP coatings. The results show that during the cathodic protection period the potentials of the epoxy systems are less negative than those of the silicate system. For the zinc rich ethyl silicate paints, the initial values of the resistance through the binder and the charge transfer resistance associated with zinc dissolution are several orders of magnitude lower than those of the organic zinc paints, while the initial values of the capacitance due to the binder layer between Zn dust and the double layer capacitance for zinc dissolution are several orders of magnitude higher than those of the organic zinc paints. Furthermore, the deterioration with time of capability of the zinc particles in the paint to provide cathodic protection to the steel was interpreted.

Alternative System of Industrial Paint Applied to Spherical Mount for Liquefied Petroleum Gas

The present article reports the application of zinc ethyl silicate paint and the use of internal and external paint schemes on carbon steel spheres for the storage of liquefied petroleum gas. The new paint scheme eliminates the steps of blasting in the field and minimizes the collection of waste generated and the environmental impact, reducing the service time onsite and therefore providing a productivity gain and better health and cleanliness at work. The results were obtained through test runs and qualified in bodies-of-proof made with the same characteristics as the sphere, that is, using the same material (carbon steel), thickness, and mechanical formation and subject to the same conditions of design and implementation process. The paint scheme was approved, qualified, and committed to the supplier’s warranty with the paint manufacturer and assembler of the storage spheres for liquefied petroleum gas.

Optimising the corrosion performance of pre-painted steels

Pre-painted steel is one of the most important structural material of the 20th century well known for its excellent corrosion resistance and wide ranging applications.A typical pre-painted steel usually consists of a layer of metal coating system,preferably zinc or zinc alloy coating and a combination of layers of inorganic - organic coatings usually referred to as paint system.The corrosion resistance of the metal coating as well as the paint system may vary considerably based on their composition and the environment.For optimal corrosion performance of pre-painted steel,a judicious selection of both metal and inorganic-organic coating systems are essential.This paper reviews different types of possible corrosion issues in pre-painted steels and methods to optimise their performance.

环氧乳液和防锈剂对水性防腐涂料性能的影响

研究了不同环氧乳液和防锈剂配比对水性防腐涂料主要性能的影响。结果发现:当DER-425环氧改性乳化剂的质量分数为14%,DER-439环氧树脂的质量分数为56%时,合成的环氧乳液的平均粒度为923 nm,黏度为4.1 Pa·s,涂层表现出良好的耐硫酸、盐酸、丙酮和二氯乙烷性能。当采用质量分数为0.6%的石墨烯对环氧乳液进行改性,且石墨烯改性乳液与复合亚磷酸锌铝盐防锈剂的质量比为(6~8)∶1时,涂料通过了1104 h的中性盐雾试验,最大冲击高度达到50 cm,耐酸和耐有机介质的性能较佳。

锌铝双金属涂层的制备和性能

首先研究了成膜物质(包括改性环氧树脂、聚苯乙烯树脂和丙烯酸树脂)对冷涂锌涂层基本性能的影响,然后考察了膨润土和聚酰胺蜡作为防沉剂对冷涂锌涂料的贮存稳定性,添加特殊聚酯类和磷酸酯类附着力促进剂后的效果,以及防锈填料的组成对涂层耐盐雾性能的影响。结果表明,采用丙烯酸树脂为成膜物质,添加质量分数分别为1.2%和0.3%的膨润土与聚酰胺蜡作为防沉剂,使用0.7%的特殊聚酯类附着力促进剂,由质量比为25∶22∶13的球锌、片锌和片铝组成防锈填料,可以得到一种防腐蚀性能优异的锌铝涂料,其耐中性盐雾性能可达3 000 h。

硅酸锌-硅酸钾水性防腐涂料的制备与性能表征

针对蒸压加气混凝土(AAC)板材中钢筋常用的有机溶剂型防腐涂料存在挥发性有机物(VOC)、易老化等问题,采用改性高模数硅酸钾溶液、硅酸锌粉末和助剂制备水性无机硅酸盐防腐涂料,研究了硅酸锌掺量对涂料施工性能、附着力和粘结强度的影响,对涂料的化学组成、物相构成、微观形貌进行了表征,并对涂料的防腐性能进行分析。结果表明:随着硅酸锌掺量的增加,涂料粘结强度下降,附着力先增大后减小,当硅酸锌掺量为50%(质量分数)时,因成膜物质与颜填料比例适中,制备的涂层物理力学性能和防腐性能较优,附着力、粘结强度分别为3.90 MPa和1.80 MPa,且浸泡7 d后,开位电路、极化电阻分别为-221 mV、39470Ω·cm^(2),平整光滑的漆膜、基材表面的钝化膜和AAC与涂料界面处相对致密的水合硅酸钙为基材提供了良好的物理屏蔽。

利用废富锌油漆渣制备氧化锌及其资源化利用

采用了湿法浸出的方法,进行了硫酸回收废富锌油漆渣中的锌并将其制备成高纯度氧化锌的研究,考察了在硫酸浓度10%,固液比20%、浸出时间10 h,温度25℃,转速50 r/min的条件下,锌的浸出浓度为95.03 g/L,浸出率为94.50%。将浸出液的pH值调到3.5,反应温度80℃,反应50 min后,浸出液中的铁完全沉淀。向浸出液中加入碳酸钠溶液制备碳酸锌,过滤洗涤干燥后,马弗炉中600℃分解2 h得到高纯度的氧化锌。锌的回收率为84.86%,损失率为15.14%。对浸出渣的浸出毒性进行测试,结果表明浸出渣没有浸出毒性,且主要成分为SiO_(2),可以用于制备水泥、陶瓷、玻璃,从而实现废富锌油漆渣的资源化利用。

车间生产过程中影响石墨烯锌粉涂料性能的因素

以车间生产1000 kg涂料为例,通过将石墨烯颗粒制成浆料后在最初的环氧树脂稀释阶段投加,解决了石墨烯的团聚问题,同时少量多次地投加锌粉,提高了涂料的分散效率,最终获得批量生产稳定的高性能石墨烯锌粉涂料。

海运集装箱无锌粉末涂层体系的实验研究

本文通过对比试验研究的方法,验证了集装箱用无锌粉末涂层具有全面优于水性漆涂层的质量性能,消除了客户对粉末涂层无锌的质量担忧,并且验证了无锌粉末涂层与现有集装箱制造工艺的相容性。

浅谈燃气轮机铸件用溶剂型无机富锌涂料的过程控制

结合溶剂型无机富锌涂料在燃气轮机铸件上的应用经验,系统地分析了溶剂型无机富锌涂料施工过程中表面处理、施工环境、涂料调配、涂装方法和干燥等因素的控制对涂装质量的影响,并提出适用于溶剂型无机富锌涂料的施工工艺和设备。

富锌漆研究进展

综述了 70年来富锌漆的研究与应用的若干进展 ,对富锌漆的分类、防蚀机理、耐久性、性能特点以及存在的问题和补救措施等 ,进行了比较全面的评价 .简单介绍了用于富锌漆的锌粉的分类和性能特点 ,此外 ,还介绍了有关富锌涂层电化学研究的一些进展 .

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.

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。

水性无机富锌涂料

概述了由高摩尔比的硅酸钾和锌粉制成的水性无机富锌涂料的组成、性能、防腐机理和应用。测试结果表明，该涂料综合性能优良，是一种发展前景十分广阔的重防腐涂料。