共查询到20条相似文献,搜索用时 62 毫秒
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制备用于潮湿环境中的自修复微胶囊及防腐涂层。利用扫描电镜观察微胶囊形貌,通过热重分析,获得其热稳定性数据。使用激光粒度分析仪测试其粒径分布规律。将其作为填料制成埋植型自修复防腐涂层,涂敷于Q235钢表面,采用电化学阻抗谱(EIS)研究其在海水中不同浸泡周期的腐蚀行为。结果表明在防腐涂层保护下,自修复微胶囊有阻挡海水渗透涂层的作用。微胶囊中的修复剂有填补涂层空缺的作用,增强了阻挡海水与Q235钢的接触作用。制备的自修复涂层具有修复划痕的功能。交流阻抗图表明该涂层能增强耐蚀性能。 相似文献
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以改善磷酸盐防腐涂料的常温固化性能为目的,采用磷酸二氢铝溶液作为粘结剂,氧化镁、氢氧化铝和二氧化硅作为填料,通过添加不同掺量的硅溶胶,使磷酸盐涂料在常温下固化成膜。对常温固化磷酸盐涂层进行了附着力测试和微观结构表征,并通过电化学测试研究了涂层在3.5%NaCl溶液中的腐蚀行为。结果表明,硅溶胶的加入使得涂层附着力增大,腐蚀电位正移,腐蚀电流密度降低,有效提高了涂层的耐蚀性能。其中,5.6%硅溶胶改性的磷酸盐涂层的腐蚀电流密度最低,腐蚀电位最正,极化电阻最大。经过720 h中性盐雾试验后,涂覆该涂层的Q235钢板基底表面依旧光亮且无腐蚀产物。 相似文献
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金属原油储罐的腐蚀与防护 总被引:3,自引:0,他引:3
针对原油储罐腐蚀的现状,为提高油罐的使用寿命,减少油罐事故发生率,分析了造成油罐腐蚀的原因。并提出了具体的防腐措施。同时对油罐防护施工中应注意的几个问题进行了探讨。 相似文献
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通过实验 ,提出腐蚀产物滞留对腐蚀过程的加剧作用 ,揭示了腐蚀产物滞留加剧腐蚀过程的机理 ,提出了减缓滞留腐蚀产物对腐蚀过程加剧作用的方法 相似文献
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Rudolph G. Buchheit Hong Guan Suhakar Mahajanam Fariaty Wong 《Progress in Organic Coatings》2003,47(3-4):174-182
In this study it is shown that anion-exchanging hydrotalcite compounds dispersed as a particulate additive in organic resins leads to potent corrosion inhibition of an underlying aluminum alloy substrate. The use of this additive also imparts the ability to detect environmental changes in the coating that are a prelude to substrate corrosion. Corrosion inhibition is derived from release of a decavanadate from crystalline Al–Zn hydroxide-based hydrotalcite particles into electrolyte that has permeated the pore space of the coating. Decavanadate release is accompanied by uptake of chloride ion in an exchange reaction. The exchange of the large decavanadate anion for the smaller chloride ion in the hydrotalcite structure results in a predictable change in crystal structure, which can be detected by X-ray diffraction. The occurrence of the decavanadate-chloride exchange reaction indicates that aggressive electrolyte has invaded the coating and that corrosion may be imminent. In this paper, methods for synthesizing an Al–Zn-decavanadate hydrotalcite particulate suitable for dispersion in an epoxy resin are described. Results from exposure and electrochemical tests illustrating corrosion protection by the hydrotalcite pigmented coatings are presented. Additionally, the characteristic changes in the X-ray diffraction pattern of hydrotalcite associated with the decavanadate-chloride exchange are presented. Diffraction patterns collected from coated Al substrates are also presented, indicating that diffraction-based interrogation of coatings is possible. 相似文献
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This paper describes a multiscale (from global to micron) model for the prediction of atmospheric corrosion. The model has a modular structure, in which the higher scales set the boundary conditions for the lower scales, and the lower scales alter some of the constants in the upper scales. The model has primarily been designed for Australian conditions and so focuses on corrosion by marine aerosols. The upper level modules look at aerosol production by oceans and surf beaches, salt transport and deposition, and cleaning events such as rain and wind, to provide an estimate of salt retention on surfaces. Separate modules that define surface temperature, surface relative humidity, and wetting and drying of deposited hygroscopic salts, enable the prediction of the (three-hourly) ‘state’ of a surface, where ‘state’ is defined as dry, wet from rain or wet from the wetting of hygroscopic salts. The state model is combined with a damage model to estimate the progression of damage with time. Currently, damage models are either probabilistic (define the occurrence, growth or death of pits as probability functions) or empirical (define a single relationship between mass loss in a given state on the basis of measured data) in nature, but new experimental and modelling research is being undertaken to develop first-principle models of corrosion under established oxide films. 相似文献
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海洋环境(海水、海洋大气和海泥)是条件极为严苛的自然腐蚀环境。船舶和海洋工程等长期服役在海洋环境中的钢铁结构体极易被腐蚀。有机缓蚀剂具有分子结构可设计性强、缓蚀效率高、作用时间长等优点,可有效阻止或减缓金属的腐蚀。因此,在海洋防腐涂料中添加有机缓蚀剂是提升其耐蚀性能的有效方法。该文结合国内外最新研究进展,综述了有机小分子缓蚀剂和聚合物缓蚀剂的特性及其在海洋防腐涂料中的应用,包括总结归纳各种有机缓蚀剂的分子结构和性能影响因素,分析有机缓蚀剂的表征手段和作用机制,讨论不同添加工艺对有机缓蚀剂在防腐涂料中的应用研究。最后,对有机缓蚀剂未来发展方向进行了展望。 相似文献