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本文用腐蚀失重方法、夹层腐蚀实验方法和电化学电位极化方法研究了缓蚀剂在飞机清洗剂中的缓蚀性能,研制出了一种复合型全有机高效缓蚀剂。这种缓蚀剂具有缓蚀效率高、安全环保、对飞机清洗剂性能无影响等优点。 相似文献
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碳化混凝土再碱化技术的研究 总被引:10,自引:0,他引:10
混凝土碳化是引起钢筋混凝土结构物中碳化腐蚀的主要原因之一,针对碳化腐蚀的混凝土进行电化学再碱化防腐技术的研究,试验中对经加速碳化的钢筋已腐蚀的砂浆试件,通以一定电流密度对钢筋进行阴极极化,定期测定混凝土孔隙的PH值、混凝土中钢筋的自然电位和极化电阻。 相似文献
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通过室内试验和工程实际应用,研究了基于电化学综合法的混凝土结构中钢筋锈蚀检测与评价技术。首先通过3组试件试验研究不同腐蚀条件、不同测试条件对混凝土电阻率、半电池电位和腐蚀电流密度3种电化学检测结果的影响规律,得到电化学综合法检测混凝土中钢筋锈蚀状况的递进式评定准则。以某高桩码头检测项目为依托,采用电化学综合法对混凝土中钢筋锈蚀状况进行检测,并根据该递进式评定准则对钢筋锈蚀情况进行综合评价。结果表明,基于电化学综合法的混凝土中钢筋锈蚀检测与评价技术可有效提高钢筋锈蚀状况检测的准确性和可靠性。 相似文献
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本文分析了发动机冷却系统中多种金属的腐蚀机理,并采用美国ASTMD1384腐蚀实验方法对多种防冻液缓蚀剂配方进行对比实验,开发出一种以钼酸盐、羧酸盐、硅酸盐等缓蚀剂复配的绿色环保型缓蚀剂,具有无毒、无公害和优异的多金属缓蚀性能,并对其缓蚀机理进行了分析。 相似文献
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本研究选用常见的几种无机缓蚀剂和有机缓蚀剂,对LPG/H2O/SAA/醇类/无机盐高腐蚀气雾剂体系的马口铁气雾罐进行防腐蚀研究。采用试片半浸法、高温保存法、曝晒法,研究了气雾罐类型、涂膜、表面活性剂、清洗助剂、溶剂、缓蚀剂等对缓蚀效果的影响。经实验发现,采用一种含铵缓蚀剂与其它缓蚀剂复配,可以有效抑制最严重的水线和焊缝等处的点蚀。 相似文献
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结构易发生由氯盐侵蚀引发的钢筋腐蚀、保护层开裂等耐久性问题,硅烷浸渍技术通过在混凝土表面形成疏水结构能够有效降低氯离子在混凝土中扩散深度,从而延长结构物服役寿命。但是,现有研究大部分是基于室内加速试验或短期野外暴露试验,对于华南滨海实况环境下硅烷浸渍混凝土长期防腐性能缺乏报道。采用吸水率测试、腐蚀电化学等方法系统研究华南滨海某硅烷浸渍混凝土结构工程服役12 a的防腐性能。结果显示:硅烷浸渍混凝土在服役期内外观致密、完整,表面疏水能力随服役龄期延长而略有下降;硅烷浸渍疏水层能够降低混凝土中氯离子侵蚀速度而使钢筋长期保持强钝化状态,可延长混凝土结构耐久性服役寿命。 相似文献
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《船舶与海洋工程学报》2015,(4)
The present work focused on corrosion inhibition of AA6063 type Al-Mg-Si alloy in sodium chloride(Na Cl) solution with a silicon carbide inhibitor, using the potentiodynamic electrochemical method. The aluminium alloy surface morphology was examined, in the as-received and as-corroded in the un-inhibited state, with scanning electron microscopy equipped with energy dispersive spectroscopy(SEM-EDS). The results obtained via linear polarization indicated a high corrosion potential for the unprotected as-received alloy. Equally, inhibition efficiency as high as 98.82% at 10.0 g/v silicon carbide addition was obtained with increased polarization resistance(Rp), while the current density reduced significantly for inhibited samples compared to the un-inhibited aluminium alloy. The adsorption mechanism of the inhibitor aluminium alloy follows the Langmuir adsorption isotherm. This shows that the corrosion rate of aluminium alloy with silicon carbide in Na Cl environment decreased significantly with addition of the inhibitor. 相似文献
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以苯胺(aniline)和吡咯(pyrrole)为电聚合单体,采用循环伏安法在不锈钢电极表面电沉积出PANI/PPY/TiO2导电共聚物/无机复合薄膜.采用CV、SEM和FT-IR等测试手段对其电聚合过程、微观结构和分子结构进行了分析,同时通过Tafel极化曲线法、EIS电化学阻抗谱对PANI/PPY/TiO2薄膜在3.5%NaCl溶液中的耐腐蚀性能进行了研究.结果表明:TiO2的添加提高了导电聚合物薄膜的阳极保护和抑制腐蚀反应中电荷转移的能力,使PANI/PPY/TiO2复合薄膜的金属保护能力明显优于PANI和PANI/PPY薄膜. 相似文献
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《船舶与海洋工程学报》2021,(1)
Microbiologically influenced corrosion is a global problem especially materials used in marine engineering. In that respect,inhibitors are widely used to control fouling and corrosion in marine systems. Most techniques used in inhibitor production are expensive and considered hazardous to the ecosystem. Therefore, scientists are motivated to explore natsural and green products as potent corrosion inhibitors especially in nano size. In this study, antibacterial and anticorrosive properties of green silver nanoparticles(AgNPs) were studied through weight loss, electrochemical characterization, and surface analysis techniques. The corrosion of copper(Cu) in artificial seawater(ASW), Halomonas variabilis(H. variabilis) NOSK, and H. variabilis + AgNPs was monitored using electrochemical measurements like open circuit potential(OCP), electrochemical impedance spectroscopy(EIS), and potentiodynamic polarization curves. AgNPs showed excellent antibacterial activity against pathogenic microorganisms. Electrochemical studies demonstrate a noticeable decrease in OCP and current density in ASW containing H. variabilis +AgNPs compared to both ASW and ASW inoculated with bacterium, which confirmed the decrease of corrosion rate of copper.Furthermore, the obtained voltammograms show that the silver nanoparticles were adsorbed on the copper electrode surface from the corrosion solution. Thus, the results prove that the novel idea of green silver nanoparticles acts as an anticorrosive film in the marine environment. 相似文献
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通过强度、握裹力、干湿冷热循环、抗氯离子渗透、阳极极化试验等方法,研究了水泥基迁移型钢筋阻锈涂料各种性能。结果表明该涂料涂刷于钢筋表面可有效抑制钢筋腐蚀,并能提高握裹力,对混凝土性能无不利影响。 相似文献