鳞片衬里在大型钢筋混凝土贮池防腐中的应用

本文介绍了钢筋混凝土贮池的几种典型腐蚀形态。分析了钢筋混凝土在不同类型介质中的腐蚀原因 ,以及橡胶、砖板、玻璃钢、玻璃鳞片、石墨鳞片、PVC等多种防腐衬里技术的优劣 ,并介绍了玻璃鳞片、石墨鳞片衬里的工程应用实例。     

鳞片衬里大型钢筋混凝土贮池防腐中的应用

本文介绍了钢筋混凝土贮池的几种典型腐蚀形态。分析了钢筋混凝土在不同类型介质中的腐蚀原因,以及橡胶、砖板、玻璃钢、玻璃鳞片、石墨鳞片、ＰＶＣ等多种防腐衬里技术的优劣,并介绍了玻璃鳞片,石墨鳞片衬里的工程应用实例。     

石墨衬里技术在氟化工项目中的应用

以氟化工项目中的氟化氢铵冷却结晶釜的防腐设计为例,介绍在氢氟酸介质工况中石墨衬里的材料选择、结构设计、衬里施工等方面的设计。结果表明:采用双层石墨衬里结构防腐性能可靠,传热效果良好。     

中国昊华化工(集团)总公司科技成果精选

防腐用橡胶衬里胶板生产技术　　一、简介橡胶防腐衬里胶板是一种高性能防腐、易施工的橡胶衬里。它是根据使用时温度、介质、浓度等因素 ,选取一定厚度的片状耐蚀橡胶胶料 ,贴合在基体的给定表面 ,形成连续完整的保护覆盖层 ,藉以隔离腐蚀介质对基体的作用 ,达到防腐的目的。CL - 2 1是针对进口化纤闪蒸设备而研制的一种能耐高温 ( 1 30℃ )、耐负压 ( - 75 0mmHg柱 )、耐酸碱 ( 1 0 %稀硫酸 )的新一代防腐衬里 ;A40 3是针对大型设备现场施工 ,无需热源 ,可室温硫化的橡胶防腐衬里。以上两种产品 ,处于国内领先水平。二、工艺说明一定配…     

磷肥防腐新材料——少灰耐蚀碳砖介绍

当前国内外磷酸和磷肥生产设备常用的非金属耐蚀材料有玻璃钢、耐酸橡胶和不透性石墨砖板衬里等,但在使用年限(防腐寿命)和造价成本方面不十分理想。从某些设计单位出国考察所获信息和从国外资料表明,碳材是一种较为满意的耐蚀材料,但国内尚未有生产与实际应用。1989年以来沈阳     

砖板衬里防腐蚀施工技术要求

砖板衬里防腐蚀施工技术是一种防腐性能佳、工程造价高的防腐施工技术。本文介绍了该技术的材料选用、施工技术规程、衬里后处理以及质量检查。     

大型石墨衬里的整体浇注

耐腐蚀石墨衬里传统上是用石墨板勾缝材料砌筑,且施工复杂、工期长、要求严格.该文介绍了以石墨粉为基材、酸醛树脂为粘结剂配制而成的浇注科,以浇注法制作大型石墨衬里的成功实例.用此法可实现大型石墨衬里的整体浇注.     

三胺激冷塔衬里的腐蚀成因与防腐措施

从介质含氧量、流速流态、液位控制等方面入手,结合激冷塔衬里的腐蚀形态,分析了尿素高压法46 t/d三聚氰胺生产装置中激冷塔衬里的腐蚀成因,并根据设备工况,有针对性地提出了相应的防腐措施。     

砖板衬里施工技术

<正> 一、应用简况化工设备进行砖板衬里的目的,主要考虑到防腐蚀、耐磨损。化工生产过程中,由于流体冲刷以及介质具有强烈的腐蚀性,对设备进行腐蚀,消耗大量钢材,使设备使用寿命缩短,而且会造成跑、冒、滴、漏现象,威胁安全生产,所以防腐蚀问题引起人们的关注和重视。科研、设计单位长期进行研究,施工使用部门不断实践,对防腐技术已积累了不少经验,当前化工防腐蚀方法是多种多样的,砖板衬里仅是其中之一。砖板衬里技术在实际应用中具有良好的条件,且施工简便,造价不高,材料来源广,作为塔、罐、池、槽等的内壁衬里保护层,具有防腐蚀、抗磨损等优异性能。例如,染化九厂在反应罐、干燥塔等设备内衬里作为防腐蚀保护层,已经使用多年,效果显著,经久耐用,保证了生产,减少了检修工作量。其规格:φ1000毫米×H6000毫米;材质:钢壳,内壁水玻璃胶泥衬铸石板三层;干燥剂:氯化     

耐高温腐蚀的玻璃钢衬里的树脂选择与工艺设计

玻璃钢(FRP)对许多高温介质的腐蚀,都有良好的防腐效果。采用钢质设备,衬FRP防腐层的工程造价仅为全FRP设备的1/3,不到不锈钢设备造价的1/5。另外,不锈钢不耐稀酸,氯气等介质的高温腐蚀。采用FRP材质制造整体设备,又存在强度、刚度、联接等问题。因此,对一些高温介质腐蚀问题,采用钢质设备,衬FRP防腐层是较好的方案。从广东省的应用情况看,多数效果不佳,有些高温介质条件下的防腐蚀衬里,仅使用几个星期。究其原因,主要是选材和施工工艺不当。设计人员对FRP缺乏了解,     

复合衬里在半水法磷酸萃取槽防腐上的应用

介绍半水法磷酸萃取槽腐蚀方案设计及对比,提出隔离层采用氯化丁基复合橡胶板,防腐层采用呋喃树脂胶泥衬碳板。实际使用表明,该复合衬里技术具有很好的成本优势,现场施工简单,运行周期长,维修频率低。     

Multifunctional Refractory-lined Vessel: Ladle Aggregate

A ladle primarily is a container used to transport molten steel from the steelmaking unit to the casting facility.The essential requirements are heat resistant,insulative and strong enough to hold molten steel up to 300 t,with a structure of multilayered refractory lining in a steel shell vessel.When a ladle is assembled with three-phase graphite electrodes,a ladle furnace forms,starting steel refining process with/without the vacuum tank degasser and RH circulating degasser,in order to meet the growing demand on high purity and higher quality steel.The working lining is under aggressive conditions that comprise the chemical reaction with molten steel,the severe corrosion of liquid slag,the disaggregation through oxidation,and the strong stress due to the impacting of the melts and gases and the effects of thermomechanical behaviors.Magnesiacarbon brick is one of the major materials,being indispensable for the slagline of a ladle furnace.Alumina-magnesiacarbon brick has played an important role to substantially increase the service life in the metal zone,from the early lining materials of high alumina and doloma bricks.The permanent lining must assume sufficient responsibility to allow finishing the process of the engaged charge in case of a failure in the working lining.The insulation layer must be as thin as possible in order to maximize the ladle’s capacity,and reduce the shell temperature for saving energy.In this issue,several integrant refractories are reviewed or investigated in order to compile a lining overview,and to contribute a prolonged service life under aggressive working conditions of the ladle furnace.     

Corrosion resistance of AlN-based ceramics to molten uranium

A kind of AlN-based ceramics was prepared as a lining material of the high-density graphite crucible for high temperature melting uranium. During the corrosion experiment, the corrosion rate showed a downward trend with the increase of corrosion time. As the corrosion time increased from 2 h to 8 h, the corrosion rate showed a gradual downward trend from 0.25 mg cm^?2 h^?1 to 0.22 mg cm^?2 h^?1, and then decreased significantly to 0.07 mg cm^?2 h^?1 at 16 h. A dense layer consisting of UO₂, Y₂O₃ and UC was formed between molten uranium and AlN-based ceramics, and the thickness increased with the extension of corrosion time, resulting in a significant decrease in corrosion rate.     

Microstructures and Corrosion Resistance of Al2O3—C Based Refractories to the Melts Containing Titania

The corrosion resisance of the Al2O3-C based refrac-tories in melts containing titania has been studied by quasi-station immersion and rotary immersionThe corrosion rate is decreased with the addition of graphite carbon and ZrO2 in the refractories.The corrosion mehanism of Al2O3-C refractories is the oxidization of graphite carbon by the oxides of the melts and the formation of deteriorate layer,For the Al2O3-C-ZrO2 refractories,the corrosion behavior is due to the interaction between melts and refrac-tories,The new compounds of FeO.SiO2,SiZrO4,Feo.3CaO,2CaO.SiO2 and CaO.SiO2 are formed in the deteriorate layer.     

Polypyrrole films modified with graphite layer on mild steel

Electrochemically synthesized polypyrrole coating was modified with very thin graphite layer and top coated with another polypyrrole film. The corrosion behaviour of this coating has been investigated in aqueous sodium chloride solution. The synthesis of polypyrrole coatings was carried out by cyclic voltammetry technique, from aqueous oxalic acid solution. Electrochemical impedance spectroscopy and potentiodynamic measurements were used for corrosion tests. The cyclic voltammograms obtained in oxalic acid solution and the polarisation curves obtained in sodium chloride solution showed that the stability of coating was improved significantly by graphite layer. The impedance spectra also showed that the corrosion process was controlled by the diffusion rate along the coating, even after 96 h immersion period. The Warburg coefficient values were calculated and used to evaluate the barrier property of coating with time. It was shown that the water up taking process was slowed down by the hydrophobic nature of the graphite layer sandwiched between the two polypyrrole films.     

玻璃钢双壁储油罐内衬导静电材质添加量对树脂粘度的影响

本文主要研究石墨,碳黑,云母三种不同的导静电材质对于储罐内衬层树脂粘度的影响。实验以对苯树脂作为基体,分别以石墨,碳黑,云母作为导静电材质,通过球模均匀搅拌制备玻璃钢储罐内衬所需防静电树脂,并采用旋转粘度计测试不同材质、不同比例条件下树脂的粘度值,实验结果表明,石墨对于树脂粘度值影响较小,可以作为内衬防静电树脂的添加材质。     

MP树脂耐腐蚀导电涂料的研究

采用MP树脂为基料,复合鳞片石墨及相应溶剂和助剂制备导电涂料,研究了制备工艺,考察了鳞片石墨导电性能和耐腐蚀性能。实验表明,该种涂料是一种可长期用在严酷环境中,性能优越的导电材料.     

Insulating Permanent Lining of Calcium Hexaluminate Based Castable for 300t Ladle in Baosteel

Minimizing of heat loss of liquid steel through the ladle lining led to the integration of increasing insulation function of the permanent lining and high-quality insulating layer between the permanent lining and the ladle steel shell.In this paper,a study was made on physical and thermomechanical properties and corrosion resistance of calcium hexaluminate based castables.The chemical and physical properties of CA6 based castables fabricated in this work can fulfill general requirements of the permanent lining in ladle.The permanent linings of CA6 based castables offer superb thermal insulation and corrosion resistance,compared to conventional refractory systems of 300t ladle in Baosteel.Both functions of insulation and safety work effectively in whole process of ladle operation.     

Mechanical Properties of Oxidation-Resistant SiC/C Compositionally Graded Graphite Materials

Mechanical properties of oxidation-resistant SiC/C compositionally graded graphite materials composed of a CVD SiC coating layer, a SiC/C graded layer, and a graphite substrate were studied by bending, compressive, and hardness tests at room temperature. CVD SiC coated graphite and graphite with a SiC/C graded layer alone were also examined. The bending strengths of oxidation–resistant SiC/C compositionally graded graphite materials as well as CVD SiC coated graphite were about twice as much as that of graphite. The bending and compressive strengths of graphite with the SiC/C graded layer alone were almost the same as those of graphite. The higher strengths of graphite with the CVD SiC layer can be mainly due to the CVD SiC strength itself, and partly due to the smooth CVD surface. No effect of the SiC/C layer on the strengths was discussed in terms of porosity, surface morphology, and the strength of SiC.