火力发电厂循环水管防腐蚀涂料系统

分析了火电厂埋地钢质循环水管的腐蚀环境和涂层使用要求等,介绍了埋地管道应用的多种涂层体系,着重介绍了高固体分改性环氧防腐蚀涂料系统在循环水管上的应用。     

无溶剂环氧饮水管路防腐涂料的制备及性能研究

介绍了无溶剂环氧饮水管路内壁防腐涂料的制备及性能研究。该涂料无溶剂、无毒无味,试验表明具有与管道、管壁良好的附着力、耐磨性、耐腐蚀性,对多种介质具有抵抗性能等特点,适用于城市饮用水管路和远距离输配水管道内壁的防腐保护。     

Enamel coatings based on slag wastes from heat and electric power plants

The possibility of manufacturing a protective corrosion-resistant enamel coatings that are based on slag wastes from heat and electric power plants and intended for oil steel pipes has been considered. A number of compositions of glass-slag-enamel coatings have been developed. The prepared samples have been tested for strength of adhesion to metal, chemical resistance, and corrosion resistance. It has been demonstrated that the synthesized protective corrosion-resistant glass-slag coatings satisfy all the specified requirements.     

环保型油田管道内壁纳米环氧防腐涂料的研究

油田管道腐蚀和结垢造成了巨大的损失，防腐、防结垢比较困难，而且涂料在热镀锌管上难以附着，为此进行了大量的研究工作，首先，通过合成固化剂，解决了涂料在热镀锌管上附着力差的问题；其次，合理选用颜填料以及纳米SiO2和纳米TiO2．同时选用有效降低表面张力的助剂，使表面结垢得到了比较好的控制。另外，通过控制混合溶剂的挥发速率，使产品能较好地适应长管道、小直径的特殊施工工艺及设备，并使产品施工固体分高。施工产生的漆雾少．具有很好的环保性能。     

球墨铸铁管新型防腐涂层喷涂设备及工艺的研究

介绍了球墨铸铁管防腐涂层喷涂设备和工艺,确定了喷涂的工艺参数。通过所得到的涂层性能表明此工艺和设备适用于球墨铸铁管防腐涂层的涂装,此技术在球墨铸铁管防腐领域有着广阔的发展前景。     

Nanocrystalline Coatings in Copper Pipes for Cold Water Plumbing Systems

Copper is the most important raw material for cold‐water plumbing systems in private and public buildings. One disadvantage of copper pipes is that small amounts of copper dissolve into the drinking water. Protective layers of cuprite (anodic coatings industrially applied) typically have lattice imperfections that can facilitate general corrosion. In this study, cuprite coatings were applied cathodically using electrolysis. The galvanic deposition at fixed voltage resulted in a coarse crystalline coating; the crystallites had a [111] fibre texture. Pulsed electrodeposition (PED) resulted in a variety of layers with different semiconducting characteristics. With this procedure, nanocrystalline arrangements could also be produced. In this case however, it was only possible to coat short sections of piping, which led to increased disorder at the edges. All coated pipes, together with untreated control pipes, were connected for a period of one to three years to the public drinking water system. During this time, nearly all of the coated pipes demonstrated a lower level of copper solubility than the control pipes.     

Highly reliable energy-efficient glass coatings for pipes transporting energy carriers, liquids, and gases

Comparative characteristics of known materials which are used to increase the longevity of steel pipes are presented. It is shown that glass enamel coatings provide effective protection from corrosion. The physical and technological characteristics of fused frits (water resistance, impact strength, microhardness) fall within the GOST 24405-80 limits. __________ Translated from Steklo i Keramika, No. 3, pp. 23–25, March, 2007.     

钢质热煨弯管用无溶剂液体环氧涂料的研究

热煨弯管是整条管线外防腐层的薄弱环节,不仅涂敷操作困难,而且对搬运、堆放的要求也较高,因此热煨弯管的外防腐层应选用性能可靠、技术经济性好、搬运、堆放和施工操作方便的材料。无溶剂液体环氧涂料用于热煨弯管的外防腐在国内外均有较多的使用实例,西气东输工程部分管道就采用了液体环氧涂料防腐层,从施工效果来看,其主要优点是环氧涂料与钢管表面粘结性优异、耐化学介质侵蚀、防腐性能好、阴极剥离半径小,适于在现场施工;但存在固化时间长、韧性差等缺点。钢质热煨弯管用新型无溶剂液体环氧涂料研究的试验证明,新型无溶剂液体环氧涂料既具有良好的防腐蚀功能,又具有快干和机械强度高的特点。     

Physico-chemical properties of ceramic pigments for high-temperature application

Heat resistant coatings are required primarily for stacks, exhaust pipes, reactors, space crafts and similar equipments that are permanently or occasionally exposed to elevated temperatures. High-temperature coatings are generally based on silicone resin with ceramic and metallic pigments. In this study, iron oxide, cobalt oxide (thermo chromic compound) and aluminum oxide are used for the preparation of four new types of coloured pigments. The thermal resistant characteristics of these ceramic pigments were studied by differential thermal analysis, thermo gravimetric analysis and differential scanning calorimetric analysis. These ceramic pigments are found to be thermally stable up to 400 °C.     

YG系列油管防腐蚀涂料的性能研究

针对井下油管的腐蚀环境和防腐蚀涂覆的需要,研制了YG系列油管防腐蚀涂料,包括YG-01烘烤固化型油管涂料和YG-03常温固化型油管涂料等。性能研究结果表明:YG系列油管防腐蚀涂料具有优异的耐盐雾、耐酸和耐油田污水等耐腐蚀性能;以及在高温高压下耐H2S/CO2腐蚀和耐碱等性能,并具有较好的综合性能,可以满足不同腐蚀环境下井下油管内防腐的涂覆需要。其中YG-01满足国内现有进口油管/钻杆内防腐涂覆作业线的工艺要求。     

重力下水道中混凝土的微生物诱导腐蚀及防护涂层(英文)

Microbiologically induced corrosion of concrete(MICC) and its protective coatings has a high economic impact on sewer maintenance and rehabilitation.A better understanding of the micro-organisms and the biogenic acids that are generated in the sewer is essential in controlling the corrosion of concrete pipes and protective coatings.The role of succession of micro-organisms growth in the corrosion of concrete and protective coatings was evaluated in this study.Examination of various sewer pipe materials exhibiting various extents of degradation,including concrete,cement based and epoxy based coating revealed the presence of both organic and biogenic sulphuric acids.This reflects the activity of fungi and the thiobacilli strains.Organism growth and metabolism were strongly related to the substrate pH.Fungi were found to grow and metabolise organic acids at pH from 2.0-8.0.Whilst the thiobacilli strains grew and generated sulphuric acids at pH below 3.0.The successive growth of the organisms provides an important bearing in developing improved strategies to better manage sewers.     

一例无溶剂环氧涂层失效分析

西气东输管道沿线压气站的埋地管线使用了无溶剂环氧涂料,在过去新疆段的部分压气站内出现了埋地管道泄露的情况,为了解无溶剂涂层在四道班压气站的应用状况,进行了开挖调查,结果发现,管线上的无溶剂环氧涂层总体质量较差,出现了大量的剥离、破损和脱落等现象,防腐层厚度不均匀,小管线上涂层厚度严重不足,给管线的正常运行带来了严重安全隐患,因此建议及时对防腐层进行修复。     

无溶剂环氧输油气管内低表面处理防腐减阻涂料的研制

以液态环氧树脂、稀释剂为基体树脂,以腰果壳液改性酚醛胺为固化剂,以复合铁钛粉、磷酸锌、氧化铁红、聚四氟乙烯、沉淀硫酸钡、陶瓷微珠等为填料,在多种功能助剂的配合下制备成无溶剂环氧输油气管内低表面处理防腐减阻涂料.集带锈带油、带湿涂装为一体,具有防腐、减阻、耐磨等特性.     

Rapid development of thickness‐controllable superamphiphobic coating on the inner wall of long narrow pipes

A novel electrochemical technique had been introduced to prepare nanocrystalline superamphiphobic coatings inside of narrow pipes of significant length. The axially propagated ultrasound was utilized to ensure the scaling‐up potential of this technique. The coating had strong mechanical strength, durability in low/high pH solutions and the potential of controlling its thickness while preserving a stable nonwetting performance. In addition, the properties of anti‐scaling and drag reduction under the flowing circumstance had been demonstrated. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3636–3641, 2017     

铁基形状记忆合金管道接头的性能研究

针对环氧粉末内防腐涂层的内补口问题,将铁基形状记忆合金管道接头应用于环氧粉末内防腐涂层管道,并对其进行了水压、拉拔和腐蚀等性能试验。结果表明,铁基形状记忆合金管道接头连接系统的密封性能、耐压性能和抗拉拨性能得到了显著提高,且耐蚀性及抗氧化性能优良。     

钢铁企业旧管网系统防腐施工

旧管网系统腐蚀严重，需要对管道、支架等钢结构及砼支架进行防腐，根据现场条件，采用机械除锈达到St3级，并制定配套防腐方案。施工组织中要求进行配套性试验，对防腐涂料进行检验，并对每一道工序进行严格验收，以保证施工质量。     

铝塑复合管的市场和发展前景

北京塑料工业协会对于铝塑复合管的调查和研究结果表明要正确认识铝塑复合管的优点和缺点;要看到在建筑给水管领域内有多种塑料管道都在发展;要注意到国外应用铝塑复合管总量和比例都不很大;国内大量应用铝塑复合管的条件还没有成熟;建筑给冷热水管的总用量有限,过多过急投资铝塑复合管很可能引发恶性竞争。     

Analysis of corrosion protection behavior of Al2O3-TiO2 oxide ceramic coating on carbon steel pipes for petroleum industry

Corrosion is the deterioration of materials by chemical interaction with their environment. In the oil and gas industry, corrosion of the pipelines and other equipment is one of the leading causes of failure and the corrosion-related costs are very high. Hence, corrosion protection is an essential requirement. In this study, the objective is to analysis of the corrosion protection behavior of spray Alumina-Titania (Al₂O₃-TiO₂) oxide ceramic coating on carbon steel pipes C45 using two different thermal spray coatings processes. These two different thermal spraying coating, High velocity oxy-fuel (HVOF) and plasma thermal spraying techniques can be used instead of extensive treatment by expensive chemical formation of coatings on pipelines and equipment to improve or restore a component's surface properties or dimensions and to protect them from corrosion. Molten or semi-molten ceramic composite powders are sprayed on the surface in order to produce a dense coating layer. FESEM of coated samples showed that a high temperature of plasma coating method end in melting the ceramic powders and creation of completely melted regions on the coated samples’ surface compared to HVOF coating techniques. Corrosion testing of coated samples in seawater (3.5% NaCl) was conducted within 30 days. Electrochemical impedance spectroscopy (EIS) as well as potentiodynamic polarization outcomes represented that the corrosion resistivity of plasma coating technique for this type of ceramic composite is better than HVOF coating technique. However, both types of coating techniques are protecting the substrate against seawater.     

The effect of MIO pigments on corrosion resistance and adhesion of synthetic rubber-based primer

In this research, the corrosion resistance and adhesion property of a synthetic rubber-based primer reinforced with different ratios of micaceous iron oxide (MIO) pigments were studied. Coatings were applied on carbon steel panels and also on steel pipes of 219.1 mm outer diameter. Scanning electron microscopy (SEM) was used to investigate the dispersion of MIO particles in the rubbery matrix. The anticorrosion performance of the coatings was studied, using electrochemical impedance spectroscopy (EIS) and salt spray tests. In addition, the adhesion of primers to carbon steel substrates was evaluated by pull-off test. In order to investigate the effect of MIO particles on the flexibility of the pigmented primers, a cupping test was conducted. The adhesion of cold-applied tape to the formulated primers was assessed by peel adhesion test using hanging mass method. The results indicated that adding 5, 10, and 15 wt% of MIO pigments into the primer improved corrosion resistance of the coatings. An increase in the MIO loading up to 10 wt%, improved the adhesion of the primer to both steel substrate and cold-applied tape.     

Modern developments and design criteria for unmodified,modified and oriented PVC pipes

Abstract

Pipe materials technology and market needs have combined to advance developments in material savings while enhancing pipe properties. Progress in increasing PVC pipe material design stresses from 10 to 32 MPa and the corresponding reduction in wall thicknesses and safety factors are described. The concepts of strength and toughness as applied to design criteria for PVC-U, PVC-M and PVC-O pressure pipes are considered. The fulfilment of stringent requirements of modified pipes for the mining industry and other applications is described to illustrate the versatility and durability of PVC pipes.