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。     

一种新型气相防锈吸湿剂

气相防锈技术是近年来应用于金属防锈方面的一项新技术。采用气相缓蚀剂、膨润土和氯化钙制备了一种气相防锈吸湿剂。通过防锈和吸湿性能试验,表明本产品不仅具有气相防锈的性能,还具有良好的吸湿性能,可以广泛应用于湿度比较大的环境中金属产品的防锈。     

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.     

铸铁文物用气相缓蚀剂研究

采用气相甄别法、失重法和封闭空间挥发减量法研究了多种气相缓蚀剂(VCI)对铁器文物的缓蚀效果,以此为基础,研制出了缓蚀性能优异的复合气相缓蚀剂。用扫描电子显微镜(SEM)和X射线散射能谱(EDS)研究了该缓蚀剂的缓蚀机理。     

气相缓蚀剂的研究进展简

作为抑制金属制品大气腐蚀的重要手段之一,气相缓蚀剂近来备受关注并取得较大进展。本文介绍了气相缓蚀剂目前的国内外发展概况,阐述了气相缓蚀剂的分类、性能、评价方法和作用机理,并展望了气相缓蚀剂今后的发展方向。     

咪唑啉衍生物缓蚀剂的研究

叙述了咪唑啉衍生物药剂的合成过程，对单一、复合咪唑啉衍生物药剂的缓蚀、阻垢性能进行了试验，与其它缓蚀剂作性能对比试验。合成的咪唑啉衍生物缓蚀剂将用于解决吉林油田污水腐蚀问题，讨论了该缓蚀剂在试验水中的作用机理。     

银表面防变色膜PMM性能研究

采用硫华气相腐蚀实验，紫外光曝露加速腐蚀实验和电化学极化曲线法对PMTA（1-巯基-5-苯基甲氮唑）、MBO（2-硫基苯并恶唑）、MBI（2-巯基苯并咪唑）、复配缓蚀剂PMM的防银变色作用进行了比较和研究，结果表明，PMM防银变色性能最好，显示出协同效应，防变色膜的AES和XPS研究结果表明，PMM在银表面上所形成的了防变色膜比单组分缓蚀剂防变色膜致密且稳定，从而能够更有效地防银变色。     

低聚型气相缓蚀剂双—（吗啉甲基）—脲的研究开发

研究开发了一种吗啉二聚体,双－（吗啉甲基）－脲作为气相缓蚀剂,采用多种方法对其气相缓蚀能力进行了评价。结果表明它是一种性能优良的黑色金属气相缓蚀剂,对铜、铝等有色金属也有一定的缓蚀作用。采用Ｋｕｎｄｓｕｎ法测定其饱和蒸气压为１．７３×１０＾－２Ｐａ。电化学极化曲线研究表明它对金属的阴极电过程有明显的抑制作用。     

气相缓蚀剂的研究与应用

介绍了国内外气相缓蚀剂的发展历程，阐述了气相缓蚀剂的发展方向，总结了当前气相缓蚀剂的研究与应用情况。     

气相缓蚀剂的研究现状及发展趋势

综述了国内外气相缓蚀剂的发展历程,阐述了气相缓蚀剂的作用原理、应用形式及评价方法,对气相缓蚀剂的发展趋势进行了展望。     

油酸酰胺作为防锈添加剂的防锈性能研究

目的以油酸酰胺作为防锈添加剂自制防锈剂,优选配方,考察防锈性能。方法以环保型缓蚀剂水溶性硅酸盐为主要原料,以酰胺型表面活性剂为添加剂制备工序间水基防锈剂,通过电化学测试、耐候试验和扫描电镜等评价其性能。结果电化学测试结果表明,涂抹自制防锈剂后,腐蚀电流密度降低到9.12×10-7A/cm2,腐蚀电位提高到-0.4206 V。结论与市售防锈剂对比,以油酸酰胺为添加剂制备的水基防锈剂可以明显提高碳钢的耐腐蚀性能。     

缓蚀剂添加量对Q235螺纹钢耐蚀性能的影响

目的提高螺纹钢的耐蚀性能。方法采用模拟穿水淬火冷却工艺,在加入ZnSO_4缓蚀剂的介质中对Q235螺纹钢进行淬火热处理。通过XRD测试、大气腐蚀和电化学测试(包括极化曲线和交流阻抗)等手段对不同淬火介质中Q235螺纹钢进行表征和测试。结果淬火处理后试样表面生成Fe_2O_3、Fe_3O_4和Zn(OH)_2的保护膜,当ZnSO_4缓蚀剂添加量达到120 mg/L时,Q235螺纹钢的腐蚀速度由自来水淬火状态的0.4583 g/(d·m~2)降低到0.2083 g/(d·m~2),腐蚀速度降低了54.5%;Q235螺纹钢的腐蚀电位由-0.3752 V提高到-0.2997 V,增加了20.1%;腐蚀电流由5.2482×10~(-5)A降低到1.6082×10~(-5)A,降低了69.3%;容抗谱Rr由25.58Ω增加到32.52Ω,增加了27.1%。Q235螺纹钢在模拟雨水中的极化形式为电化学极化。结论 ZnSO_4缓释剂可有效提高Q235螺纹钢的耐蚀性能。     

Effects of different simulated fluids on anticorrosion biometallic materials

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芳香希夫碱在油田采出水中的缓蚀性能研究

目的研究不同复配型芳香希夫碱缓蚀剂在油田采出水中对N80碳钢的缓蚀效果。方法采用静态失重和旋转挂片实验比较四种芳香希夫碱的缓蚀速率,采用电化学测试、扫描电镜和EDS手段对N80碳钢进行表征和分析。结果在油田采出水中添加芳香希夫碱复配型缓蚀剂后,试样表面生成以铁、碳、氧元素为主的保护膜,当四种缓蚀剂的添加量达到90 mg/L时,N80碳钢的腐蚀速率下降趋势变化缓慢,a型缓蚀剂的缓蚀效果最好,其用量为90 mg/L时,N80碳钢的腐蚀速率降低到0.0087 mm/a,自腐蚀电位由-0.8112V提高到-0.7345 V,自腐蚀电流由77.79μA下降到5.410μA,缓蚀率可达到93.05%。结论四种希夫碱复配缓蚀剂均有较好的缓蚀性能,缓蚀剂的缓蚀效果顺序为abdc。     

硫脲对非调质钢在HCl酸洗溶液中的缓蚀作用

目的 研究硫脲(TU)对非调质钢在HCl溶液中的缓蚀作用.方法 通过动电位极化曲线、电化学阻抗谱研究硫脲对非调质钢在HCl溶液中的缓蚀效应,采用KH-7700型三维视频显微镜观察非调质钢的腐蚀形貌.结果 非调质钢在不合缓蚀剂的HCl溶液中的自腐蚀电位(Ecorr)为-0.566V,自腐蚀电流密度(Jcorr)为12.57 mA/cm2.随着HCl溶液中硫脲浓度的增加,非调质钢的自腐蚀电流密度(Jcorr)逐渐减小,反应电阻(Rct)逐渐增大,界面双电层电容Cdl降低,缓蚀效率逐渐增加,阴极极化曲线几乎重合,而阳极极化曲线逐渐正移.当HCl溶液中加入5g/L硫脲时,缓蚀效率达91.17％,效果好于市售酸洗缓蚀剂AS-30,能够有效消除非调质钢在HCl酸洗液中的腐蚀麻点.结论 硫脲对非调质钢在HCl溶液中具有明显的缓蚀效应,能够有效消除非调质钢酸洗过程中的腐蚀麻点.     

多相流动状态下缓蚀剂对X70钢CO2腐蚀的影响

目的 研究在多相流动状态,尤其是段塞流动条件下,各种浓度的不同缓蚀剂对X70钢腐蚀的影响.方法 采用自制实验装置模拟起伏管路段塞流动条件,通过电子显微镜、挂片失重等方法,对挂片表面形貌、腐蚀速率进行分析,数值仿真了多相流动状态下缓蚀剂乙二醇对X70钢CO2腐蚀速率的影响.结果 自制实验装置的挂片表面形貌、挂片失重速度与真实环道实验相似.实验用缓蚀剂的质量浓度超过35 mg/L后,均匀腐蚀缓蚀效率提升明显,继续提高缓蚀剂的浓度,均匀腐蚀缓蚀效率变化不大.多相流动条件下,缓蚀剂对局部腐蚀的缓蚀效果不明显.仿真用缓蚀剂乙二醇的质量浓度达到250 mg/L后,缓蚀效率变化与实验结果类似.结论 自制实验装置可以模拟起伏管路内气液两相流动状态,实验结果可靠.缓蚀剂的最佳缓蚀效率存在临界浓度,小于临界值时,对挂片的缓蚀作用甚微,超过临界浓度时对挂片表面的腐蚀速率影响不大.段塞流动状态下,缓蚀剂的缓蚀作用仅针对挂片均匀腐蚀,对局部腐蚀影响不大,甚至会促进局部腐蚀的发展.     

油酸钠在乙二醇-水溶液中对AM60镁合金的缓蚀作用

采用电化学方法和扫描电子显微镜研究了油酸钠对AM60镁合金在50%(体积分数)乙二醇-水溶液中的缓蚀作用。结果表明:油酸钠能抑制AM60镁合金在乙二醇-水溶液中的腐蚀,是一种阳极型缓蚀剂,随着油酸钠量的增加,缓蚀率逐渐增大;油酸钠在常温和高温下对AM60镁合金在乙二醇-水溶液中均有较好的缓蚀作用,且常温下油酸钠的缓蚀效果更好;油酸钠在AM60镁合金表面的吸附为自发过程,且符合Temkin吸附等温方程。     

Corrosion resistance improvement of Ti-6Al-4V alloy by anodization in the presence of inhibitor ions

Colorful thin oxide films were synthesized by galvanostatic anodization on Ti-6Al-4V alloy. Three different aqueous solutions containing corrosion inorganic inhibitors (Na₂MoO₄, NaH₂PO₄ and NH₄VO₃) were employed for the anodization treatment. The effect of inhibitor anions on the corrosion behavior of the alloy in Ringer solution was studied. Open circuit potential (OCP), Tafel polarization, linear sweep voltammetry (LSV) and chronoamperometry (CA) were performed to evaluate the corrosion performance of the treated electrodes. The incorporation of the inhibitor ions was detected by the release of Mo, V and P through ICP-AES technique. The formed oxides were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that compact, amorphous oxides without pores or cracks were obtained independently of the solution used. The sample anodized in Na₂MoO₄ solution registered the lowest corrosion current density (0.11 μA/cm²), and it was able to protect the alloy even after 168 h of immersion in Ringer solution. No cracks or corrosion products were detected. The XPS analysis reveals the incorporation of molybdenum to the oxide film in the form of Mo⁶⁺ and Mo⁴⁺.     

Effect of additive on corrosion resistance of NiFe2O4 ceramics as inert anodes

In order to improve the corrosion resistance of NiFe2O4 ceramics as inert anode, additive V2O5 was added to raw materials NiO and Fe2O3. The inert anodes of nickel-ferrite ceramics were prepared by powder metaUurgic method and the static corrosion rate in Na3AlF6-Al2O3 was determined by mass loss measurement. The effect of V2O5 on sintering property and corrosion resistance was studied. The results show that V2O5 can promote the grain to develop completely and improve sintering property. EDS results show the reaction product Ni2FeVO6 distributes along the grain boundary. The corrosion tests show that V2O5 is beneficial to improving corrosion resistance remarkably. The reasons that V2O5 can improve the corrosion resistance must be V2O5 promoting the gains to develop completely and Ni2FeVO6 distributes along the grain boundary. The stable structure can control the chemical dissolution of ceramics anode and the reinforced grain boundary can control the grain-boundary corrosion rate.     

Corrosion behaviour and galvanic coupling of titanium and welded titanium in LiBr solutions

Corrosion resistance and galvanic coupling of Grade 2 commercially pure titanium in its welded and non-welded condition were systematically analyzed in LiBr solutions. Galvanic corrosion was evaluated through two different methods: anodic polarization (according to the Mixed Potential Theory) and electrochemical noise (using a zero-resistance ammeter). Samples have been etched to study the microstructure. The action of lithium chromate as corrosion inhibitor has been evaluated. Titanium and welded titanium showed extremely low corrosion current densities and elevated pitting potential values (higher than 1 V). The results of both methods, anodic polarization and electrochemical noise, showed that the welded titanium was always the anodic element of the pair titanium-welded titanium, so that its corrosion resistance decreases due to the galvanic effect.