金属表面环氧聚氨酯涂层的去除机理研究

以飞机上常用的环氧、聚氨酯涂料为研究对象,通过溶剂对涂层的作用、红外光谱测试和热重分析等方法,研究水溶性去漆剂对金属表面交联固化涂层的去除机理.实验及研究结果发现,去漆剂去除涂层要有溶胀涂层的溶剂,还要有渗透力强的溶剂;涂层脱除过程中,去漆剂的溶剂分子与涂层高分子之间没有发生化学反应,去漆剂对涂层高分子链段无降解破坏作用,而是使高分子链段网状结构扩大,使涂层膨胀鼓起,与金属基材分离;根据溶解度参数原则,固化后涂层的溶解度参数与固化前树脂的溶解度参数及去漆剂的溶解度参数相比较,得出应该根据涂层固化后的溶解度参数来选择溶胀涂层的溶剂,而不是沿用涂层固化前树脂的溶解度参数来设计去漆剂.     

8652丙烯酸涂料漆膜发脆原因及其对策

8652丙烯酸涂料为装饰防腐涂料中最佳者,是我国涂料的新品种。但随着生产最递增,在配装中逐渐发现漆膜脆易掉漆,经多种方法,大量工艺试验发现,漆膜发脆是由稀释剂中的“SN”抗静电剂所致。采取调整稀释剂配方,从根本上解决了漆膜发脆易掉漆的关键。     

DL无苯新型二合一防锈装饰漆

武汉现代工业技术研究院近日研制成功一种ＤＬ无苯新型二合一防锈装饰漆技术 ,该技术采用廉价的高分子材料经改性制成 ,产品成本低于普通醇酸调合漆 30 %左右 ,性能稳定 ,不含苯类溶剂 ,漆膜光亮鲜艳 ,可耐酸、碱、盐等腐蚀。产品广泛用于各种金属结构件 ,木制品和混凝土等表面装饰保护 ,它可直接涂刷在金属构件上 ,不用任何底漆配套 ,因该产品含有防锈剂和转锈剂 ,对金属件上的锈层有很好的转化作用 ,从而起到较好的防锈性和装饰性等DL无苯新型二合一防锈装饰漆@黄春玺     

常用脱漆剂

前处理，除了对被处理表面进行必要的除尘去污、脱脂、除锈等处理工序外，若被处理表面尚残留有漆膜，则还必须对附着于被处理表面的旧漆膜进行脱漆处理。如果不彻底去除这些旧漆膜，则将严重影响随后的电镀或涂装工艺处理，严重影响镀涂层与被处理表面之间的附着力，以及镀涂层的保护和装饰性能。     

福州：清洁无污染新型光固化涂料问世

由福州汉森漆业有限公司自行研制的新型光固化涂料日前经福州大学权威专家鉴定，质量达到甚至超过国际同类产品的标准。与国内市场上现售的UV漆相比。该产品具有易施工、漆膜硬度高、高光泽度、耐磨性强、丰满度高、附着力好、耐老化、能承受高低温度变化等突出性能。     

面漆桔皮的控制方法

1漆膜厚度 在满足遮盖力要求的前提下,应尽量降低金属色漆的漆膜厚度,同时尽可能地提高清漆涂层膜厚度。     

环氧富锌底漆漆膜脱漆剂的研制

随着环氧富锌底漆的广泛应用，对脱漆技术的研究甚为迫切。文中介绍了自配的以复合溶剂为主溶剂，添加其它助剂的脱漆剂。该脱漆剂在25℃时25min内可使漆膜软化、脱落，经SEM测试表明对底材腐蚀性影响小；与现有脱漆剂相比脱漆效率提高了30％，节省用量20％。文中还探讨了脱漆温度、漆膜厚度、底材处理方式等工艺因素对脱漆效率的影响，优化了工艺参数。     

漆膜起皱现象初探

针对油基漆、醇酸漆等易发生的漆膜起皱现象进行探讨,并提出了表面膜概念.认为表面膜是影响漆膜起皱的主要因素.表面膜形成速度快,就易发生起皱;表面膜形成速度慢,就会避免起皱现象的发生.而表面膜形成速度是可调的,通过调节,可有效防止漆膜起皱,并能改善漆膜干燥性能.     

漆膜起皱现象的初探

针对油基漆、醇酸漆等易发生的漆膜起皱现象进行探讨，并提出了表面膜概念，认为表面膜是影响漆膜起皱的主要因素，表面膜形成速度快，不易发生起皱；表现膜形成速度慢，就会避免起皱现象的发生，而表面膜形成速度是可调的，通过调节，可有效防止漆膜起皱，并能改善漆膜干燥性能。     

在用压力容器渗透探伤及表面漆层去除方法

渗透探伤是一种以毛细管作用原理为基础的检查开口缺陷的无损检测方法,因其具有携带方便、操作简单、无需水电等优点,被广泛应用于在用压力容器接管角焊缝和对接焊缝的探伤。渗透探伤前,需去除压力容器焊缝表面的油漆涂层,常用的油漆涂层去除方法有去漆剂清洗法、热碱溶液清洗法和燃烧法等。其中,操作简单方便的装有钢丝轮的角向磨光机打磨法是常用的方法之一,以下就该方法能否满足渗透探伤灵敏度要求进行探讨。1　国内外对表面漆层去除方法的规定JB 4730—1994《压力容器无损检测》渗透检测篇规定受检部位的油漆涂层应该去掉,但对去除…     

不锈钢板料拉深润滑新工艺

不锈钢板料拉深时,在毛坯表面涂覆丙烯酸清漆有效避免了毛坯和模具工作表面直接摩擦,解决了不锈钢拉深粘模、划伤工艺难题,拉深后零件表面光洁。将丙烯酸清漆用于不锈钢、高温合金、钛合金板料拉深成形,都获得了良好的效果。     

钢管除锈新工艺

利用盐酸酸洗度液配制的闭路循环除锈剂能清除钢管表面氧化铁皮。介绍了该锈剂的工业性试验及其废液再生方法。     

难加工材料的特性及其应用前景

高温合金、钛合金、不锈钢、超高强度钢以及高温结构陶瓷等难加工材料，主要用于航空、航天、舰船、核电、石油化工、汽车和坦克等工业，随着材料科学和先进制造技术的发展，难加工材料有更广阔的应用前景。本文介绍了难加工材料的内涵、性能及应用前景。     

铸造金属耐磨材料研究的进展

详细介绍了耐磨材料奥氏体锰钢、低合金钢和白口铸铁的成分、组织、性能及其应用进展,还对耐磨钢结材料和耐磨铸造复合材料以及新开发的高硼铸造耐磨合金进行了评述,期待为科学选择耐磨材料提供参考。     

连铸用耐火材料对洁净钢的影响及其发展

分析了连铸用耐火材料对洁净钢的影响,并针对连铸用耐火材料对钢水洁净度的影响如增碳等,就其发展进行了评述,认为采用钙质等碱性材料和无碳无硅或低碳低硅材质有利于洁净钢的生产.     

On the role of deterioration of structures in their performance; with a focus on mining industry equipment and structures

Some examples of materials performance of civil materials such as steel and concrete in mining industry are considered. These examples are about structural steels (either as support for the structure or the equipment) and concrete structures. Also, it is mentioned that in mine sites that contain sulphide minerals, the formation of acid mine drainage (AMD) may also contribute to decreasing the integrity of civil and supportive structures. Using these examples, an effort has been made to emphasise that in order to extend the service life of structures in very aggressive environments such as those encountered in mining industry, a sound knowledge of deterioration and corrosion‐enhancing factors in addition to standardised application of measures against deterioration (such as painting) can be very applicative.     

Localized corrosion studies on materials proposed for a safety-grade sodium-to- air decay-heat removal system for fast breeder reactors

The present investigation was carried out to assess the localized corrosion resistance of materials proposed for the construction of the safety-grade sodium-to-air decay-heat removal system for fast breeder reactors. The materials, such as Alloy 800,9Cr-lMo steel, and type 316LN stainless steel, in different microstructural conditions were assessed for pitting and stress-corrosion cracking resistances in a chloride medium. The results indicated that 9Cr-lMo steel in the normalized and tempered condition can be considered for the above application from the standpoint of corrosion resistance.     

Microalloyed Steel Bars and Forgings

This paper examines microalloyed steels—steels which develop their properties in the as-received condition without requiring further heat treatment, such as quenching and tempering. Microalloyed steel bars and forgings offer a clear cut potential for cost reduction and energy savings. The metallurgy for producing high strength microalloyed bars and forgings is in place. However, significant improvement in the notch toughness of these materials is necessary, and the metallurgy required to achieve this toughness improvement exists. With application of the necessary metallurgical techniques in rolling mills and forge shops, the utilization of high strength microalloyed steel bars and forgings will increase greatly.     

我国不锈钢复合板材的制造技术及应用

不锈钢复合板不仅可以满足多种结构材料对高强度和高耐腐蚀性的双重性能要求,而且还可以节省不锈钢材料的用量,显著降低各种产品的材料成本。介绍了我国不锈钢复合板材的主要制造工艺技术,同时对我国不锈钢复合板市场的应用及需求进行了分析,并对未来不锈钢复合板材的制造技术及应用进行了展望。     

Korrosionsuntersuchungen zur Entwicklung von Dekontaminationslösungen für Nuklearanlagen – Teil II: Das Korrosionsverhalten verschiedener Werkstoffe der Kerntechnik in fluoridhaltigen komplexbildenden sauren Lösungen

Investigation of corrosion in the development of decontamination solutions for nuclear systems – Part II: The corrosion behaviour of several nuclear materials in fluoride containing, complex forming acid solutions Because of their capability to dissolve the radionuclide-containing oxide layers on nickel-chromium alloys, aqueous solutions of fluorboric acid, silicofluoric acid, and potassium silico-fluoride are suitable for decontaminating high temperature gas turbine materials. In these solutions, the nickel-chromium alloy Nimocast 713 LC as well as the molybdenum alloy TZM as turbine blade materials are only slightly corroded without pitting corrosion. However, they cause heavy pitting corrosion on the mild steel 21 CrMoV 5 11 of the turbine rotor. Though the extensive corrosion rates of the mild steel can be reduced by up to two orders of magnitude by adding suitable, solution specific inhibitors to the solutions, the formation of pits is not completely avoidable.