碳钢水冷器阻垢防腐涂料及其应用

介绍碳钢水冷器阻垢防腐涂料的特性、配方的选择及涂层冷却器的应用情况，并对涂层对热传导的影响、涂层的使用寿命及涂层冷却器应用的经济效益等问题进行了讨论。     

大型钢结构的腐蚀与长效涂层保护（Ⅰ）

介绍了大型钢结构的类型，腐蚀情况，并着重阐述了其多种长效涂层防护措施及应用情况。     

聚三氟氯乙烯耐蚀涂层的制备与应用

介绍了聚三氟氯乙烯／碳钢耐蚀复合塔耐蚀涂层的配方，制备工艺，性能测试及应用情况。     

射频法涂层碳纤维的高温氧化性

国内外为提高碳纤维的高温氧化性，采用化学气相沉积法在碳纤维表面涂覆抗氧化涂层技术已广泛应用。本文采用低温射频法对碳纤维涂覆碳化硅涂层，并对涂层碳纤维进行800℃高温抗氧化性研究。热重分析发现，此种涂层碳纤维具有一定的抗氧化性，其氧化失重与时间和温度呈现抛物线规律变化。利用电子探针及透射电镜研究发现，涂层的表面致密化程度和界面结合情况是影响其抗氧化性的关键因素。     

碳/碳复合材料高温抗氧化涂层的研究进展

抗氧化涂层体系主要用于高温长时间抗氧化的情况,是当前研究的重点。文章主要对复合涂层体系进行了综述,重点阐述了双层复合涂层、多层复合涂层、梯度复合涂层和晶须增韧复合涂层,并对目前涂层体系存在的不足及今后研究的方向进行了阐述。     

动车组涂层涂装工艺对涂层附着力影响的试验研究

动车组外表面使用的涂料及涂层体系均满足中国铁路总公司企业标准 Q/CR 546. 1— 2016中的技术指标要求，其本身性能并无问题。但在实际运行过程中仍然会出现诸如失光、起泡、开裂等涂层缺陷问题，这些问题缩短了涂层的使用年限，增加了维修成本。为解决上述问题，结合现车实际施工工艺的特点，通过对涂装工艺前处理方式包括打磨方式、清理方式、涂层固化时间、漆膜厚度和涂层喷涂间隔等进行改变，考察涂层附着力的变化情况。研究结果显示，不同前处理条件下，划格法附着力保持不变，拉开法附着力数据非常接近，表明实际的现场施工环境和不同的前处理条件对涂层系统的附着力几乎没有影响。     

复合材料及其涂覆层耐候性研究

本文介绍了复合材料及防护涂层在湿热区海洋性气候条件下的耐腐蚀性自然环境试验情况，并对结果进行了分析。     

从管道检测的角度,分析涂层失效的原因

本文首先阐明涂层对管道保护的重要作用，综述了目前长输管道涂层现状及常用涂层材料的特点，通过近几年来对数千公里管道的不同类型涂层检测、评价，总结出涂层失效的主要形式，从管道周围介质的腐蚀性、环境及涂层施工等方面，分析了外界条件与涂层失效的关系，以及导致涂层失效的主要原因。目前长输管道涂层失效的形式主要有：涂层的剥离、龟裂、破损及变形等。     

涂层织物的开发及应用

叙述了涂层织物的加工方法和涂层方式，介绍了用于涂层织物上的几种涂层剂，重点讨论了涂层织物的开发及应用。     

金属阳极涂层最终失活初探

阳极涂层由于涂层消耗而失去活性。本文初步讨论涂层最终失活期间其涂层消耗，析氯电位变化情况。     

阴极电泳涂料的发展动态

介绍了电泳涂料的特点及其发展现状。重点介绍了几类目前发展较快的阴极电泳涂料，并对其未来发展方向作了简要概述。     

阴极电泳涂料的发展趋势

阴极电泳涂料作为一种环保型的水性涂料,具有广阔的应用前景。介绍了电沉积原理,阴极电泳涂料树脂的特点以及阴极电泳涂料的优越性。概述了国内外阴极电泳涂料的现状及需求,重点介绍了几类目前发展较快的阴极电泳涂料,同时指出了阴极电泳涂料今后的发展趋势。     

Evaluation of thick organic coatings degradation in seawater using cathodic protection and thermally accelerated tests

Organic coatings are often associated with cathodic protection to fight against the corrosion of metallic structures when immersed in seawater. However, cathodic protection leads to the generation of a strong alkalinity at the metal/coating interface, which causes the degradation of the coating. It is then necessary to develop a reliable method to evaluate the compatibility between organic coatings and the application of cathodic protection.

On one hand, cathodic disbonding tests (ASTM G-8 and G-80) can be driven with an artificial defect but this defect is mainly responsible for the electrochemical response. In addition, calcareous deposit rapidly forms onto the defect zone when cathodic protection is applied which can make difficult the evaluation of coating delamination. On the other hand, immersion of defect-free specimens requires very long testing periods (several months or even years) in order to detect the coating degradation.

In this work, an attempt to accelerate the coatings degradation by imposing a high temperature and thermal cycles were made in order to decrease the test-time duration. The influence of the applied cathodic potential was also investigated. The coating degradation was evaluated by EIS, considering the defect-free zone of coatings. It was shown that the coating degradation is faster in the presence of a defect and for high temperature (45 °C). Moreover, thermal cycles allow to greatly accelerate the degradation of defect-free coatings and then to compare the compatibility of both coatings with cathodic protection.     

Cathodic disbonding of a thick polyurethane coating from steel in sodium chloride solution

The cathodic disbonding of a thick, pigmented polyurethane coating from steel in 3.5 wt.% NaCl solution was studied by using an electrochemical AC impedance technique. Double-cylinder electrolyte cells were designed to separate the measurements of cathodic disbonding process from the influence of the impedance of an artificial defect. It was found that for a thick, pigmented polyurethane coating, the more important transport pathway of the reactive species is along the coating/steel interface rather than through the coating. There existed a delay time for the cathodic disbonding process, and cathodic polarization was not a predominant factor in determining the cathodic disbonding behavior in the early stages. The thick polyurethane coating, which was applied on a well sand-blasted steel surface, had excellent resistance to cathodic disbonding.     

An investigation of cathodic oxygen reduction beneath an intact organic coating on mild steel and its relevance to cathodic disbonding

An epoxy-coated mild steel panel was coupled with bare mild steel to characterise the cathodic reaction underneath the paint and study the short term change in properties of the coating under cathodic polarisation. It showed that the cathodic reaction obeys the Tafel law and is not controlled by either the high coating resistance or oxygen transport through the coating.     

环氧树脂阴极电泳涂料的研究

阴极电泳涂料作为一种环保型的水性涂料,具有广阔的应用前景.在此采用半封闭的甲苯二异氰酸酯作为固化剂制得了环氧树脂阴极电泳涂料.探讨了合成树脂的反应条件,并对所得阴极电泳涂料的性能进行了测试.结果表明,在适宜的电泳工艺参数下,可以得到外观光滑平整,综合性能优良的漆膜.     

地下钢制管道阴极保护技术现状与应用

针对地下钢质管道腐蚀新情况、新问题,从延长油气输送管道的使用寿命角度出发,详细分析钢质管道腐蚀形态、腐蚀机理、防腐方案;以某地区埋地钢质管道为例,主要采用阴极保护和防腐涂层联动保护体系,是一种进行钢制管道防腐的有效方法,并得到了牺牲阳极、强制电流和阳极井等阴极保护技术相应各项指标和要求,以及对阴极保护技术系统管理经验,为类似的地下钢质管道防腐提供了技术支持。同时通过介绍国内外阴极保护技术研究现状,指出阴极保护与强电干扰软件的开发将是我国现阶段发展方向。     

Disbondment Mechanisms for a Heat Shrink Polyethylene Coating on a Cathodically Protected Hot Pipeline

Interfacial adhesive failure of a pipeline coating was found to be related to the operating temperature of the pipeline, the presence of moisture at the coating/steel interface and cathodic polarisation of the steel. The application of cathodic protection was found to be more detrimental to a pipeline coating than was the immersion of the coating specimens in alkaline environments without polarisation. It is suggested that in the system examined cathodic disbondment is initiated at a coating holiday by the electrochemical reduction of Fe₃O₄ in the interfacial oxide film and that propagation of the disbondment is associated with electrocapillary action which reduces the surface tension between the steel and the crevice solution. This process increases the thermodynamic disbonding force between the adhesive and the steel in the aqueous environment.     

埋地输油管道检测、维修与评估的探讨

为了保证某公司所属12条埋地管道的安全运行,基于国内外通用的管道完整性管理理念,对12条埋地管线进行了有针对性的检测、维护与改造。首先进行管道腐蚀环境调查、阴极保护效果测试,基本掌握管道防腐层破损严重、阴极保护效果较差的管段,同时,对腐蚀防护系统保护效果较差的管段,开展有针对性的全面检验检测。在此基础上,对存在严重安全隐患的管段,采取防腐层修复与阴极保护改造措施以确保管道运行安全。实践证明,对在用的输油管道,采取必要的全面检验与针对性维护措施是确保管道安全运行的有效手段。     

Electrochemical impedance spectroscopy as a tool to measure cathodic disbondment on coated steel surfaces: Capabilities and limitations

The disbondment of protective organic coatings under excessive cathodic protection potentials is a widely reported coating failure mechanism. Traditional methods of evaluating cathodic disbondment are based on ex situ visual inspection of coated metal surfaces after being exposed to standard cathodic disbondment testing conditions for a long period of time. Although electrochemical impedance spectroscopy (EIS) has been employed as an effective means of evaluating various anti-corrosion properties of organic coatings; its application for assessing the cathodic disbondment resistance of coatings has not been sufficiently exploited. This paper reports an experimental study aimed at developing EIS into a tool for in situ measurement and monitoring of cathodic disbondment of coatings. A clear correlation between EIS parameters and the disbonded coating areas has been confirmed upon short term exposure of epoxy-coated steel electrodes to cathodic disbondment conditions; however the degree of this correlation was found to decrease with the extension of exposure duration. This observation suggests that EIS loses its sensitivity with the propagation of coating disbondment, and that in order to achieve quantitative determination of the coating cathodic disbondment localized EIS measurements are required to measure the parameters related to local disbonded areas.