共查询到20条相似文献,搜索用时 125 毫秒
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简要介绍了法兰式变送器在化肥企业各种强腐蚀介质与粘稠或易结垢介质中的腐蚀与结垢防护,防护膜的制作、使用、防护效果等。 相似文献
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文章针对不同加工设备腐蚀情况的差别,介绍了相应的防护措施及国内外先进的金属表面防腐处理新技术,指出腐蚀与防护研究的重点是合理选择抗腐蚀材料与加强表面防护。 相似文献
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磷酸为中强三元酸,具有酸的一切通性。在加热条件下能与大部分金属及其氧化物反应,在浓度升高和温度升高到一定程度后腐蚀加剧。在磷酸生产中,无论是热法还是湿法,都存在浓度与温度影响下的腐蚀问题。因此,磷酸生产中的腐蚀与防护是一个重要的课题。而正确选材是防护... 相似文献
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Sukanya Gangopadhyay Prakash A. Mahanwar 《Journal of Coatings Technology and Research》2018,15(4):789-807
Corrosion is a crucial worldwide problem that strongly affects metals. Out of the several ways to prevent corrosion, volatile corrosion inhibitors (VCIs) are predominantly used as a method of temporary protection. These compounds have the ability to vaporize and condense on the surface of the ferrous or nonferrous material and make the substrate less susceptible to corrosion but work only in a confined space. VCI compounds form a monomolecular layer over the metal surface, thereby preventing the electrochemical reactions on the metal surface which lead to corrosion. This review article outlines the use of volatile corrosion inhibitors (VCIs) as a temporary corrosion protection technique, their working mechanisms and the various compounds used as VCI. It also anchors on the latest research works which have been carried out on VCI coatings along with a glimpse of the works that were carried out in the past. The various factors affecting the volatile corrosion inhibitors along with the merits of VCI coatings are discussed in this paper. Formulations for both strippable and permanent VCI coatings are also reported with the various testing methods. Lastly, an overview of the recent developments of VCI coatings along with the various green VCI is given. 相似文献
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交流输电线路不可避免地会对埋地管道及其附属设施产生交流干扰,尤其是管道的阴极保护系统。镁阳极作为阴极保护系统的重要组成部分,明确在不同交流干扰条件下镁阳极的腐蚀行为,对保障管道的安全运行有着十分重要的意义。在传统三电极的基础上外加交流干扰,通过电化学测试分析了不同交流干扰条件下镁阳极的电化学特征。结果表明:随着交流干扰的增大,镁阳极表面生成致密的腐蚀产物层,阻碍了腐蚀反应的发生。这会导致现场镁阳极无法提供足够的阴极保护电流,从而产生管道和相关设施的欠保护问题。 相似文献
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Paolo Piccardo Roberta Amendola Sébastien Fontana Sébastien Chevalier Gilles Caboches Paul Gannon 《Journal of Applied Electrochemistry》2009,39(4):545-551
Highly-efficient solid oxide fuel cell (SOFC) systems are gaining increased attention for future energy conversion applications.
Many planar SOFC stack designs utilise ferritic stainless steel (FSS) interconnect components. During operation, surface corrosion
of FSS interconnects degrades stack operation by increasing electrical resistance and introducing other deleterious material
interactions. To minimise these effects, various surface modifications and coatings are currently under investigation. Two
of these methods under development for this application are: metal organic chemical vapour deposition (MO-CVD); and, large
area filtered arc deposition (LAFAD). SOFC interconnect-relevant corrosion behaviour of an MO-CVD coating on Crofer 22 APU,
AL453, Fe30Cr and Haynes230, and complex, amorphous LAFAD AlCrCoMnTiYO coatings on FSS 430 were investigated. Both of these
surface modifications and coatings exhibit significantly improved corrosion protection as compared with uncoated FSS samples. 相似文献
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理论上阐述了水下推进器不锈钢叶片的腐蚀机理,详细分析了影响不锈钢叶片过流表面腐蚀的各种因素.结合700QJB-280型水下推进器叶片腐蚀实例,以及污水处理厂多年运行实践,重点在合理选材、提高介质流速、涂层保护、表面清洗等方面,提出了防止水下推进器叶片腐蚀的几项技术措施.并列举了修复被腐蚀叶片的实用方法,旨在延长其有效的使用寿命. 相似文献
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根据制造高速动车组铝合金材料腐蚀的特点,以阻止和延缓腐蚀的产生为目标,设计结构充分考虑铝合金车体结构的防腐需要,同时表面处理采用不含铁的三氧化二铝材料进行喷砂,防腐底漆采用不含铁质颜料的双组分环氧底漆以及与之相配套的双组分油漆涂装保护体系对高速动车组车辆进行防腐涂装,为铝合金车辆的防腐蚀探索出了切实可行的措施,同时提供了标准的防腐涂装配套保护体系。 相似文献
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重防腐涂料用新型附着力促进剂 总被引:1,自引:0,他引:1
环氧涂料由于其优良的抗腐蚀性能和机械性能,被广泛应用于海洋涂料和重防腐涂料.在这些应用中,环氧涂料通常作为底漆直接施工在各种不同的金属底材上.当金属底材的表面处理、施工条件不一样时,要使涂料与底材获得良好的附着力并不容易.使用附着力促进助剂能有效地改善涂料对金属底材的附着力,从而提高涂层的抗腐蚀性能.本文介绍了为改善海... 相似文献
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报道通过电化学工作站、扫描电子显微镜、XRD衍射仪及原子分光光度仪研究pH、离子浓度、温度对20A碳钢腐蚀行为的影响。根据实验结果分析认为:室温(10℃C),pH=8下,OH^-与Cl^-在材料表面发生竞争吸附,低浓度氯离子溶液中OH^-对材料的腐蚀起到了较好的抑制作用;在高浓度氯离子溶液中,Cl^-对OH^-的竞争取得优势,Cl^-的侵蚀作用破坏了OH对电极表面的保护,使得碳钢的腐蚀加剧;随着温度的升高,加速了溶液离子的扩散,使得OH^-对电极的保护遭受破坏,氯离子的迁入能力增强,导致碳钢的Rct递减,Icorr增大;在70℃、0.1mol/LCl^-溶液中挂片6h,试片表面可以看到明显的两层结构,外层为疏松的Fe3O4腐蚀产物,内层可能是Fe(OH)3。 相似文献