铸铁文物复合气相缓蚀剂的复配与研究

以碳酸环己胺(CHC)为主体,通过与其它缓蚀剂复配,筛选出可用于铸铁文物保护的高效复合气相缓蚀剂。用极化曲线,电化学阻抗谱和XPS等手段研究了该复合气相缓蚀剂的缓蚀作用机理。结果表明:CHC与乌洛托品复配,具有良好的协同缓蚀效果,当乌洛托品与CHC以1∶4的质量比复配时,缓蚀率可达96.61%。该复合气相缓蚀剂是以抑制阳极反应为主的混合型缓蚀剂,能够和铸铁发生化学吸附而形成缓蚀性能良好的保护膜。     

气相缓蚀剂的研究现状与展望

从缓蚀剂的缓蚀基团和分子结构方面概述了气相缓蚀剂的研究现状，阐述了气相缓蚀剂的有关缓蚀机理。分析了缓蚀效果的影响因素．讨论了气相缓蚀剂的发展方向．     

复合气相缓蚀剂对铁质文物缓蚀机理的研究

采用乌洛脱品和胺类缓蚀剂A制成一种新的气相缓蚀剂,用模拟大气腐蚀状态的薄液膜电化学测试技术研究了复合气相缓蚀剂对铸铁试样电化学行为的影响.并通过X射线衍射(XRD)和X射线光电子能谱(XPS)分析了复合气相缓蚀剂作用于模拟带锈文物所形成的锈层结构,并探讨了其缓蚀机理.结果表明,该复合气相缓蚀剂是一种阳极型的气相缓蚀剂,对模拟带锈文物有很好的缓蚀效果,该缓蚀剂可以促进铁质文物中的不稳定锈层向稳定锈层转化,抑制基体腐蚀的进一步扩展,对铁质文物具有很好的保护作用.      

苦丁茶提取物对N80钢的缓蚀作用

采用傅里叶变换红外光谱、气相色谱-质谱、电化学阻抗谱、极化曲线和扫描电子显微镜研究了苦丁茶(KDC)提取物在含3.5%NaCl(质量分数)和饱和CO_2溶液中对N80钢的缓蚀作用。结果表明:苦丁茶提取物属于混合型缓蚀剂;该缓蚀剂对N80钢在含3.5%NaCl和饱和CO_2溶液中具有一定的缓蚀作用,能够有效抑制N80钢的腐蚀;缓蚀率随着缓蚀剂含量的增大而提高,当加入4%(体积分数)苦丁茶缓蚀剂时,根据极化曲线和电化学阻抗谱计算得到的缓蚀率分别达到了92.47%和96.90%。     

气相缓蚀剂封存防锈二十年

前言气相缓蚀剂(简称VPI)是在常温下能缓慢地挥发出缓蚀气氛,有效地抑制金属在大气中的腐蚀的一种化学物质。常用的有亚硝酸二环己胺(即VPI—260)、碳酸环己胺 (CHC)、碳酸苄胺、亚硝酸二异丙胺、碳酸单乙醇胺、苯骄三氮唑等。国外许多试验研究证实气相缓蚀剂对金属确有良好的缓蚀作用。美国从1944年开始     

复配缓蚀剂在石油沉积水中对Q235钢的缓蚀性能

采用极化曲线和交流阻抗谱法研究十二烷基苯磺酸钠(SDBS)缓蚀剂单独使用及与十六烷基三甲基溴化铵(CTAB)复配缓蚀剂在石油沉积水中对储油罐钢Q235的缓蚀性能。实验结果表明:单独使用SDBS缓蚀剂对Q235钢有一定的缓蚀效果;使用SDBS与CTAB复配缓蚀剂时,缓蚀效果明显提高,当两者复配比例为1:1且浓度都为0.5mmol/L时,缓蚀效率最高为91%,复配缓蚀剂具有很好的协同缓蚀效应。     

复合缓蚀剂在31%NaCl溶液中的缓蚀性能

利用失重法、极化曲线和交流阻抗技术研究了复配缓蚀剂(硫酸锌,葡萄糖酸钙,多聚磷酸钠)对G105钢在31%氯化钠溶液中的缓蚀行为,分析了其缓蚀机理.结果表明,复配的缓蚀剂是一种混合型的缓蚀剂,在80 ℃时,所复配的缓蚀剂在31%氯化钠溶液中的缓蚀率达到了80%以上.     

植物型缓蚀剂的研制及应用

用直接浸泡--回流法从绿茶茶叶和米糠中提取了两种缓蚀剂TL和BR。利用失重法研究了缓蚀剂TL和BR浓度、介质酸度和腐蚀时间对碳钢的缓蚀作用的影响，以及TL、BR分别与六次甲基四胺(CN)复配后的缓蚀效果，并探讨了TL、BR的缓蚀机理。失重试验和极化曲线测试结果表明：缓蚀剂TL和BR对碳钢具有良好的缓蚀作用，属于阴极型缓蚀剂。     

苯甲酸吗啉盐气相缓蚀性能的研究

在实验室一步法合成了苯甲酸吗啉盐,针对气相缓蚀剂实际使用状况对其缓蚀性能进行了评价,采用模拟大气腐蚀状态的电化学测试技术对其缓蚀机理进行了研究,结果表明它是一种性能优良,有实用前景的气相缓蚀剂.     

苯甲酸吗呆盐气相缓蚀性能的研究

在实验室一步法合成了苯甲酸吗啉盐,针对气相缓蚀剂实际使用状况对其缓蚀性能进行了评价,采用模拟大气腐蚀状态的电化学测试技术对其缓蚀机理进行了研究,结果表明它是一种性能优良,有实用前景的气相缓蚀剂。     

Correlation of content and corrosion protection of volatile corrosion inhibitors in packaging material – regaining trust in VCI

Two representative types of commercial volatile corrosion inhibitor (VCI) packaging materials without a potential for health hazards according to TRGS 615 were investigated: a paper containing ethanol amine and a polyethylene foil containing sodium nitrite as main VCI ingredients. For a variation of VCI concentration the packaging material was thermally treated at 60–100 °C and the amount of VCI remaining was determined after this accelerated desorption. Additionally a nitrite‐free polyethylene foil was impregnated with various amounts of sodium nitrite. Correlations of VCI content – of both the amine and nitrite – with corrosion protection of mild steel were observed. For ethanol amine a color change reaction is proposed to indicate the remaining potential of corrosion protection. This work is aimed at regaining trust in VCI technology.     

一种气相防锈涂料防锈效果与预膜时间的研究

研制了一种气相防锈涂料,主要由热塑性丙烯酸树脂、气相缓蚀剂(VCI)、增韧剂、抗氧化剂、抗菌防霉剂、有机溶剂等组成。把含不同VCI的涂料喷涂在标准邮政纸盒上,金属试片20#钢、45#钢、A3钢和炮钢分别粘在纸盒的上方,室温下进行不同时间的预膜,然后盒中放入电解质溶液,加热进行加速试验。结果表明相同的预膜时间、相同的金属试片,随着涂料中VCI含量的增加防锈效果越好;相同的VCI含量,随着预膜时间的延长防锈效果越好。     

金属气相防锈技术的应用进展

综述了金属气相防锈技术的发展过程、应用类型和应用状况,对其技术发展前景进行了展望.     

数控机床封装防锈技术的应用研究

简要介绍了挥发性缓蚀剂(VCI)防锈包装技术的防锈原理及其发展情况,通过对比性试验对VCI防锈包装的防锈性能进行了验证。先在模拟环境中对已采用VCI包装的机床进行单台模拟试验,然后再与采用真空包装的机床进行批量对比试验。结果表明VCI防锈包装技术防锈包装效果可靠、稳定,而且工艺简单。预计将成为防锈技术发展的主流方向。     

气相防锈材料预膜时间的测定

气相防锈材料目前已在金属防锈领域得到广泛应用,预膜时间对金属的防锈效果有相当的影响,但当前文献中的气相防锈能力评价方法却没有体现.为考察预膜时间对防锈效果的影响,采用失重法研究了两种气相防锈膜的不同预膜时间,并借助盐雾箱腐蚀试验考察了不同预膜时间对其防锈效果的影响.结果表明:不同类型气相防锈材料的预膜时间并不相同,合适的预膜时间可以取得更好的防锈效果.     

Adsorption of Monoethanolamine on Iron from a Carbon Dioxide Atmosphere

The adsorption of carbon dioxide on Armco iron at a pressure of 1 atm was revealed and studied by ellipsometry and IR spectroscopy. The conditions of the formation of adsorbed VCI layers were found to be important for steel protection. The surface preliminarily exposed to an atmosphere of CO₂ is covered with a thin (about 2 nm) adsorbed layer which significantly changes its properties. The layers of VCI adsorbed from a CO₂ atmosphere differ only slightly in thickness from those formed in air. However, the adhesion of the former is better, as evidenced by its lower K _d.     

我国挥发性缓蚀剂防锈技术的发展现状

介绍了挥发性缓蚀剂(VCI)的防锈原理,介绍了国内目前使用的VCI材料品种、构成及用途;对比了各种防锈技术的综合性能及应用效果;介绍了VCI的应用领域,分析了VCI的技术性能。     

Estimating the gas permeability of commercial volatile corrosion inhibitors at elevated temperatures with thermo-gravimetry

Volatile corrosion inhibitors (VCIs) are incorporated into packaging paper or film to protect metals against atmospheric corrosion. The vapour pressure determines the equilibrium concentration of a volatile corrosion inhibitor (VCI) in the surrounding atmosphere. However, the rate at which the VCI can be delivered across the air gap to a metal surface is determined by the gas permeability. This is the product of the vapour pressure and the diffusion coefficient: S_A = P_AD_AB. The gas permeability of commercial VCIs was estimated at elevated temperatures from vaporisation rates measured using a simple thermo-gravimetric method (TG).     

Fungicidal Properties of some Vapour-Phase Corrosion Inhibitors

Abstract

Six vapour-phase corrosion inhibitors (VCI's) were examined for their antifungal properties, with the purpose of developing a combined inhibitor for controlling both fungal and corrosive deterioration of non-metallic and metallic materials, respectively, in one package or piece of equipment. m-Dinitrobenzene and two VCI papers (Indian Patent) completely inhibited the growth of all five fungi tested.

Of the others, some were effective against certain fungi only; others could control sporulation and pigmentation, but not fungal growth. Phenyl thiourea was completely ineffective.