共查询到20条相似文献,搜索用时 31 毫秒
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Z. F. Yin Y. R. Feng W. Z. Zhao Z. Q. Bai G. F. Lin 《Surface and interface analysis : SIA》2009,41(6):517-523
This work investigates the effect of temperature on the corrosion product layer of carbon steel exposed to a CO2‐containing solution. The measurement techniques, such as scanning electron microscopy with energy dispersive spectrometry, X‐ray diffraction, and X‐ray photoelectron spectroscopy, were used to systematically characterize the morphology and composition of the corrosion product layer. The corrosion rates were calculated by weight loss method. The corrosion mechanisms as a function of temperature are studied and discussed. The results showed that temperature is an important factor in the corrosion rate of carbon steel. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Tom Breugelmans Els Tourwé Yves Van Ingelgem Jan Wielant Tom Hauffman René Hausbrand Rik Pintelon Annick Hubin 《Electrochemistry communications》2010,12(1):2-5
In this work, odd random phase multisine Electrochemical Impedance Spectroscopy (ORP-EIS) was used as a detection method for the onset of corrosion of coated steel. The possibility to use ORP-EIS as a rapid-screening test for corrosion was investigated. It is concluded that the detection of a non-linear behavior combined with a non-stationary behavior during the onset of corrosion can be used as a criterion in a rapid-screening test for corrosion of coated steel. 相似文献
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In the last decade magnesium based materials have been used in many industrial applications. Problems arise from joining technologies
and the corrosion behaviour of joined parts. The present study shows results of a new flux free soldering technology and the
study of the corrosion properties of these soldered samples. Joints have been obtained by soldering of magnesium alloy AZ31
samples among each other or to aluminum alloy AlMgSi1 as well as to unalloyed, low-carbon steel. Different corrosion protection
layers have been applied by thermal spraying. The corrosive potential of different soldered samples has been examined using
current density-potential measurements. The corrosion behaviour of coated samples has been studied by salt spray testing in
comparison to uncoated samples. 相似文献
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碳钢土壤腐蚀速度波动性表征的研究 总被引:2,自引:0,他引:2
碳钢/土壤腐蚀是复杂的随机现象。按照统计学方法,其腐蚀速度被看作服从正态分布,腐蚀速度的波动性分别用标准偏差或变异系数(CoV)表示。笔者根据大量腐蚀试验数据,将标准偏差分布看作统计分形体系,分别计算了平行腐蚀试验数据和区域腐蚀试验数据的分维,分别为1.343和1.486。通过分形修正提出新的变异系数来描述碳钢土壤腐蚀的随机波动性。此外,当平行试样数量大于6片后分维趋于恒定。新变异系数和腐蚀发生程度无关,是腐蚀速度随机波动特性更好的表征形式。 相似文献
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弱碱性介质中氯离子对铜电极腐蚀行为的影响 总被引:6,自引:0,他引:6
应用循环伏安法、X射线光电子能谱法、电化学阻抗谱法以及现场椭圆偏光法研究了在弱碱性介质中添加Cl-对铜电极腐蚀行为的影响.结果表明, Cl-的加入能加剧铜电极的腐蚀,使腐蚀电流以及现场椭圆偏振参数Δ的变化范围都增大1个数量级, Cl-对Cu2O的掺杂将使铜电极的表面膜变得疏松,膜的耐蚀性变差.椭圆偏光实验不仅与电化学和能谱实验的结果一致,而且还能定性地、清楚地分辨出铜电极腐蚀过程中Cu2O的生成、Cl-对Cu2O的掺杂、CuO的生成等不同阶段;同时,利用恰当的模型还能定量地确定各个阶段铜电极表面膜的组成、厚度的变化,从而为研究铜电极的腐蚀与防护机理提供更多有用信息. 相似文献
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The fractional free volumes(FFVs) of the adsorption films formed with different ratios of dipropargyl methoxythiourea imidazoline(DPFTAI) and pyridine quaternary ammonium salt(16BD) were calculated by simulation to determine their synergistic corrosion inhibition effect. The results suggest that the composite corrosion inhibitor at the molar ratio between DPFTAI and 16BD of 4:1 gives the best corrosion inhibition effect. This simulation method to predict the synergistic effect between corrosion inhibitors was further validated by mass loss and electrochemical experiments. This finding delivers valuable understandings of inhibition mechanism of corrosion inhibitors. 相似文献
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Lipiar K. M. O. Goni Prof. Mohammad A. Jafar Mazumder Prof. M. A. Quraishi Dr. Mohammad Mizanur Rahman 《化学:亚洲杂志》2021,16(11):1324-1364
Corrosion is a phenomenon that devastatingly affects innovative, industrial, and mechanical applications, especially in the oil and gas industries. The corrosion conceivably influences industrial equipment; it deteriorates the environment and lessens the equipment/infrastructure's lifetime. Considering the significant impact of corrosion in our daily lives, this review article aims to briefly discuss the significance of corrosion and different control methods with special attention on corrosion inhibitors. The classification of corrosion inhibitors based on types and their advantage/limitations, and heterocyclic compounds as potential corrosion inhibitors, mainly nitrogen-based compounds (pyridine (1N), pyrimidine (2N), and triazines (3N) fused ring benzimidazole, etc.), and their biological significance has been discussed in detail. The mechanism, challenges, and applications of heterocyclic compounds as corrosion inhibitors in various industrial relevant corrosive environments such as acid pickling, descaling operation in the desalination plant, oil gas industry, etc., have also been highlighted in the review. 相似文献
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应用缓蚀剂控制混凝土中钢筋的腐蚀具有高效、廉价和易操作等优点,越来越受腐蚀研究者的关注。近年来,对环保型缓蚀剂的需求日益增加。因此,本工作发展了由癸二酸二异辛酯、D-葡萄糖酸钠和硫酸锌组成的环保型复合缓蚀剂并应用电化学测试技术和表面分析方法研究其对钢筋的缓蚀作用。结果表明,Q235钢筋在pH为11.00,含0.5 mol∙L-1 NaCl的模拟污染的混凝土孔隙液中处于活化状态并发生局部腐蚀。含有59 mmol∙L-1癸二酸二异辛酯,0.5 mmol∙L-1 D-葡萄糖酸钠和1.5 mmol∙L-1硫酸锌组成的复合缓蚀剂对钢筋具有良好的协同缓蚀效应,在模拟污染混凝土孔隙液中和水泥砂浆试样中对钢筋的缓蚀效率分别达到96.8%和90.0%。该复合缓蚀剂是一种混合型缓蚀剂,对钢筋腐蚀的阴极反应和阳极反应均有抑制作用。 相似文献
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The complex characteristics and mechanisms of aluminum pitting corrosion in a solar heating system were studied by the chemical immersion method and electrochemical techniques as well as fractal theory. The results showed that pitting corrosion of Al occurred in a tap water environment due to the local enrichment of Cl? ions. The higher the Cl? ions concentration, the more negative the critical pitting potential (Eb) of Al. A linear relationship between Eb and the logarithm of Cl? ions concentration was observed. The pitting corrosion mechanism of Al in neutral water was explained in terms of complexation corrosion theory. The corrosion surface images of aluminum immersed in tap water were captured and analyzed by image processing technique and box‐dimension method. The fractal characteristics of pit distribution, described by fractal dimension, have been identified. The fractal dimension of the pit distribution increased with the increase of immersion time and had the same trend as that of the weight loss. Fractal dimension can, thus, be used as an important parameter for quantitative evaluation of pitting corrosion of aluminum. 相似文献
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S. M. A. Hosseini A. Azimi I. Sheikhshoaei M. Salari 《Journal of the Iranian Chemical Society》2010,7(4):799-806
The effects of 2,2′-[bis-N(4-cholorobenzaldimin)]-1,1′-dithio (BCBD) and bis-(2-aminophenyl) disulphide (BAPD) on the corrosion behavior of 302 stainless steel in 0.5 M sulfuric acid solution as corrosive medium were investigated using weight loss and potentiostatic polarization techniques. Some corrosion parameters such as anodic and cathodic Tafel slopes, corrosion potential, corrosion current density, surface coverage degrees and inhibition efficiencies were calculated. The polarization measurements indicated that the inhibitors were of mixed type which inhibited corrosion by parallel adsorption on the surface of stainless steel due to the presence of more than one active centre in the inhibitor molecule. The adsorption followed Langmuir adsorption isotherm. The activation energy and thermodynamic parameters were calculated at different temperatures. Results showed that BCBD had a higher inhibition efficiency compared with BAPD. 相似文献
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F. Mansfeld 《Russian Journal of Electrochemistry》2000,36(10):1063-1071
The rare earth metal salt (REMS) compounds which are non-toxic and inexpensive have been used successfully for the corrosion
protection of commercial aluminum alloys as well as of mild steel. The resistance to localized corrosion of aluminum alloys
such as Al 2024, Al 6061 and Al 7075 has been greatly improved by immersion in hot cerium salt solutions. Cerium oxides/hydroxides
were formed at sites where intermetallic compounds containing copper were located and eliminated the formation of local cathodes.
REMS solutions were also used for sealing of anodized layer on Al alloys replacing toxic chromates. In addition to increased
corrosion resistance excellent paint adhesion was observed. Cerium nitrate and yttrium sulfate solutions produced the most
satisfactory results. Cerium salts were also applied successfully as inhibitors and as pretreatment for the corrosion protection
of carbon steel in hot NH3/water solutions used in absorption heat pumps. Factorial design experiments have been used to determine the optimum concentrations
of CeCl3 and H2O2 as well as the treatment time used in the cerating process for mild steel. The corrosion protection provided by the cerated
layer was further improved by cathodic polarization in cerium chloride. A dual corrosion protection strategy employing cerating
and addition of a REMS to the working solution is expected to provide long-lasting corrosion protection of mild steel.
Dedicated to the ninetieth anniversary of Ya.M. Kolotyrkin’s birth.
This article was submitted by the author in English. 相似文献
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镁在人体模拟液中的腐蚀行为 总被引:16,自引:0,他引:16
探索了镁在人工人体模拟Hank溶液中的腐蚀行为, 发现镁在模拟液中的极化行为与在一般NaCl水溶液中相似. 电化学阻抗谱测试结果表明, 镁在模拟液中的一些具体反应对腐蚀的贡献可能比在NaCl溶液中的小. 在模拟液中, 镁腐蚀速度随时间不断变快. 这可能与模拟液中可抑制腐蚀的离子的消耗有关. 镁腐蚀产生了大量的氢气, 并使模拟液碱化. 这些结果表明, 镁虽然极有希望用作可消溶吸收的人体植入材料, 但仍有一些困难需要克服, 解决这些困难的关键在于适当地控制其腐蚀速度. 相似文献
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Yussri Salem 《Surface and interface analysis : SIA》2022,54(7):775-785
The current study aims to characterize a heavily corroded bronze statue from Pharaonic Egypt, in terms of the morphology and mechanism of corrosion. The characterization was carried out by a combination of methods, including the scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM–EDS), USB digital microscope, X-ray micro-diffraction, and Raman micro-spectroscopy. Insights into the morphology and corrosion mechanisms of two corrosion stages are presented. Specifically, the metallic-wall layer was first converted into grayish-brown corrosion mottled with green and gray spots in the central part, in which a greenish-white corrosion phase was formed in the second stage. The EDS analysis of the greenish-white phase revealed the predominance of tin, copper, oxygen, and carbon and a low chlorine content. The greenish-white phase consisted of four corrosion products: romarchite, cassiterite, malachite, and a small amount of atacamite. The morphology developed upon corrosion was attributed to the selective dissolution and depletion of copper in the central layer, internal oxidation of tin, and conversion of cuprite into malachite. Moreover, the usual bronze corrosion products were formed as a superficial layer on the statue. 相似文献
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Cocos nucifera L. water as green corrosion inhibitor for acid corrosion of aluminium in HCl solution
<正>The ability of Cocos nucifera L.water(CW) as non-toxic corrosion inhibitor for acid corrosion of aluminium in 0.5 mol/L HCl has been studied using chemical technique.CW shows significant inhibition as corrosion inhibitor,with 93%efficiency at the highest concentration of the inhibitor.The inhibitive action is attributed to the adsorption of the inhibitor molecules on metal surface following Langmuir adsorption isotherm. 相似文献