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Effect of the presence of corrosion products on the corrosion rate of lead during the exposition with paper packaging materials 在纸包装材料博览会期间,腐蚀产物的存在对铅腐蚀速率的影响
Q3 Materials Science Pub Date : 2018-07-01 DOI: 10.1515/kom-2018-0013
K. Strachotová, M. Kouřil
Abstract High sensitivity of lead to organic compounds leads to degradation of historical lead objects stored in the depositories of museums or archives. High concentration of organic compounds in the atmosphere of depositories is caused by degradation of organic materials (wood, glue, leather, paper). Organic materials are stored together with lead objects or they are used as a packaging material. This study was aimed on the influence of packaging material properties to aggressiveness towards lead with different state of surface by the resistometric method. The results showed that aggressiveness of packaging material is determined by a complex influence of material properties. The presence of corrosion products on the lead surface significantly increases its sensitivity to organic compounds.
摘要:铅对有机化合物的高敏感性导致博物馆或档案馆存放的历史铅物体的降解。仓库大气中高浓度的有机化合物是由有机材料(木材、胶水、皮革、纸张)的降解引起的。有机材料与铅一起储存或用作包装材料。采用电阻法研究了不同表面状态下包装材料性能对铅侵蚀性的影响。结果表明,包装材料的侵蚀性受材料性能的复杂影响。铅表面腐蚀产物的存在显著增加了其对有机化合物的敏感性。
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引用次数: 7
Condition evaluation of steel X65 in one of the sections of “Soyuz” gas main after long-term operation X65钢在“联盟”号天然气总管一段长期运行后的状态评估
Q3 Materials Science Pub Date : 2018-07-01 DOI: 10.1515/kom-2018-0011
P. Maruschak, R. Bishchak, O. Maruschak, D. Draganovská, A. Pylypenko
Abstract The basic regularities in deformation and fracture of pipe steel X65 are revealed by testing specimens from the pipe fragment cut during the repair of the “Soyuz” gas main after 30 years of operation. It is shown that the pipe steel slightly changes its properties when the gas main is operated under the influence of working stresses and environmental factors. Structural degradation and micro-defects accumulated in the pipe wall were scattered, indicating that the material retains sufficient plasticity that allows it to resist fracture processes and the nucleation of macrocracks.
摘要通过对“联盟号”煤气总管检修过程中切下的管坯试样的试验,揭示了X65管线钢在运行30年后变形和断裂的基本规律。结果表明,在工作应力和环境因素的影响下,煤气总管运行时,管道钢的性能略有变化。管壁中累积的结构退化和微观缺陷分散,表明该材料保持了足够的塑性,使其能够抵抗断裂过程和宏观裂纹的成核。
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引用次数: 4
Influence of deformation on electrochemical properties of Q235 steel 变形对Q235钢电化学性能的影响
Q3 Materials Science Pub Date : 2018-07-01 DOI: 10.1515/kom-2018-0015
M. Zheng, M. Shuai, J. Yu
Abstract The influence of deformation on electrochemical properties of Q235 steel is studied. The uni-axial tension of the steel is conducted on universal testing machine to get a series of strain, 0.07%, 6%, 11% and 24%, respectively. The deformation process for strain of 0.07% is controlled by load, and the others are controlled by displacement correspondingly. Afterward, the tests of potentiodynamic polarization and electrochemical impedance spectroscopy are conducted for the deformed steel in 0.01 mol.dm−3 NaCl solution. The results showed that plastic deformation leads to crystalline grains refine and elongate, and crystalline boundary increases, it induces more corrosive possibility and lower corrosive resistance; the corrosion potential of Q235 steel becomes more negative with the increase of deformation amount, and the corrosion current density increases with the amount of deformation; the corrosion resistance decrease with the increase of deformation seriously.
研究了变形对Q235钢电化学性能的影响。在万能试验机上对钢进行单轴拉伸,得到一系列应变,分别为0.07%、6%、11%和24%。0.07%应变的变形过程由载荷控制,其他变形过程则相应地由位移控制。然后,对变形钢在0.01mol.dm−3NaCl溶液中的动电位极化和电化学阻抗谱进行了测试。结果表明,塑性变形导致晶粒细化和伸长,晶界增加,腐蚀可能性增大,耐腐蚀性降低;Q235钢的腐蚀电位随着变形量的增加而变得更负,腐蚀电流密度随着变形量增加而增加;耐腐蚀性随变形量的增加而严重下降。
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引用次数: 1
Influencing the anticorrosion efficiency of pigments based on zinc ferrite by conductive polymers 导电聚合物对铁酸锌基颜料防腐性能的影响
Q3 Materials Science Pub Date : 2018-07-01 DOI: 10.1515/kom-2018-0012
K. Nechvílová, A. Kalendová
Abstract Generally, organic coatings which contain zinc ferrites are able to protect metal substrate, most often low-carbon steel, by inhibition mechanism. Conductive polymers are using a system of conjugated double-bonds to transfer a charge over the chain thereby providing their own electrical conductivity in the organic coatings. The charge from the chain in combination with the iron substrate generates electrons to the formation of passivation products on the surface of paint film. This paper is focused on combination of zinc ferrite with conductive polymer and using of synergic effect of these two components. The organic coatings were formulated from hematite and specularite on pigments concentration line 5, 10, 20 and 25 wt.% for better recognizing of the effectiveness of zinc ferrite component. The content of the conductive polymer was consistently set at 3 wt.% in each organic coating. A solvent-based epoxy-ester resin was used as a binder. The physico-mechanical and corrosion tests were performed for all samples. The corrosion signs were evaluated on the surface of coating and also on the surface of metal substrate. In the end, the efficiency was compared alone zinc ferrite and alone polymers and also their combinations.
一般来说,含锌铁氧体的有机涂层能够通过缓蚀机制保护金属基体,通常是低碳钢。导电聚合物使用共轭双键系统在链上转移电荷,从而在有机涂层中提供它们自己的导电性。链上的电荷与铁基体结合产生电子,在漆膜表面形成钝化产物。本文主要研究了铁氧体锌与导电聚合物的结合及其协同效应的利用。以赤铁矿和镜铁矿为原料,在5、10、20和25 wt.%的颜料浓度线上配制有机涂料,以更好地识别铁酸锌组分的有效性。在每个有机涂层中,导电聚合物的含量始终设定为3 wt.%。采用溶剂型环氧酯树脂作为粘结剂。对所有样品进行了物理力学和腐蚀试验。对涂层表面和金属基体表面的腐蚀现象进行了评价。最后,比较了单独使用铁氧体锌和单独使用聚合物及其组合的效率。
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引用次数: 1
Soft computing model for analysing the effect of friction stir processing parameters on the intergranular corrosion susceptibility of aluminium alloy AA5083 分析搅拌摩擦工艺参数对AA5083铝合金晶间腐蚀敏感性影响的软计算模型
Q3 Materials Science Pub Date : 2018-07-01 DOI: 10.1515/kom-2018-0014
R. Vignesh, R. Padmanaban, C. K.
Abstract Aluminium alloy AA5083 is prone to intergranular corrosion in marine environments. In an attempt to reduce the intergranular corrosion, AA5083 was subjected to friction stir processing (FSP). The FSP experimental trials were conducted as per face-centered central composite design with three levels of variation in FSP process parameters viz. tool rotation speed (TRS), tool traverse speed (TTS) and tool shoulder diameter (SD). Intergranular corrosion susceptibility of the processed specimens was assessed by performing nitric acid mass loss test. The mass loss of the specimens was correlated with the intergranular corrosion susceptibility as per the standard ASTM G67-13. The experimental results indicate that FSP had significantly reduced the intergranular corrosion susceptibility of the AA5083 alloy. Soft computing techniques namely Artificial Neural Network, Mamdani Fuzzy system, and Sugeno Fuzzy system were used to predict the intergranular corrosion (IGC) susceptibility (mass loss) of the friction stir processed specimens. Among the developed models, Sugeno fuzzy system displayed minimum percentage error in prediction. So Sugeno fuzzy system was used to analyze the effect of friction stir processing process parameters on the IGC of the processed specimens. The results suggest that stir processing of AA5083 at a TRS of 1300 rpm, TTS of 60 mm/min and SD of 21 mm would make the alloy least susceptible to intergranular corrosion.
摘要AA5083铝合金在海洋环境中易发生晶间腐蚀。为了减少晶间腐蚀,对AA5083进行了搅拌摩擦处理(FSP)。FSP实验试验按照面心中心复合材料设计进行,FSP工艺参数有三个变化水平,即刀具旋转速度(TRS)、刀具横向速度(TTS)和刀具肩部直径(SD)。通过硝酸质量损失试验评估了加工试样的晶间腐蚀敏感性。根据标准ASTM G67-13,试样的质量损失与晶间腐蚀敏感性相关。实验结果表明,FSP显著降低了AA5083合金的晶间腐蚀敏感性。采用人工神经网络、Mamdani模糊系统和Sugeno模糊系统等软计算技术对搅拌摩擦试样的晶间腐蚀敏感性(质量损失)进行了预测。在所开发的模型中,Sugeno模糊系统的预测误差百分比最小。因此,采用Sugeno模糊系统分析了搅拌摩擦加工工艺参数对加工试样IGC的影响。结果表明,在1300rpm的TRS、60mm/min的TTS和21mm的SD下搅拌处理AA5083将使合金最不易受到晶间腐蚀。
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引用次数: 6
Failure of electric products by H2S 电气产品被H2S破坏
Q3 Materials Science Pub Date : 2018-05-01 DOI: 10.1515/kom-2018-0010
D. Majtás, K. Kreislová, L. Turek
Abstract Copper is widely used metal for industrial and public purposes due to its good corrosion resistance and excellent electrical conductivity. In indoor atmospheric environments with low level of air pollution the corrosion rate of copper is very low and it is not affected by slight increasing of temperature or relative humidity. In many indoor environment hydrogen sulphide (H2S) occurs and significantly affects the copper corrosion. CuS is a loose of black corrosion product which can’t form protective film on copper surface and promote corrosion by adsorption of moisture as carrier. In sulphide presence, the corrosion product is chalcocite Cu2S. Copper corrosion attack by H2S low concentration caused significant failure of electronic, electric equipment but also other copper parts as tubes, etc. These corrosion films can form an insulating layer on the contact surfaces causing electrical failures on the electronic devices.
摘要铜具有良好的耐腐蚀性和优良的导电性,是广泛应用于工业和公共用途的金属。在空气污染程度较低的室内大气环境中,铜的腐蚀速率很低,不受温度或相对湿度轻微升高的影响。在许多室内环境中,会产生硫化氢(H2S),对铜的腐蚀有重要影响。cu是一种松散的黑色腐蚀产物,不能在铜表面形成保护膜,以吸附水分为载体促进腐蚀。在硫化物存在下,腐蚀产物为辉铜矿Cu2S。低浓度H2S对铜的腐蚀造成了电子、电气设备以及其他铜部件如管子等的重大故障。这些腐蚀膜可以在接触表面形成绝缘层,导致电子设备的电气故障。
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引用次数: 3
EIS and corrosion behaviour of plasma sprayed layers of Al and AlCr6Fe2 on AZ91 Al和AlCr6Fe2等离子喷涂层在AZ91表面的EIS和腐蚀行为
Q3 Materials Science Pub Date : 2018-05-01 DOI: 10.1515/kom-2018-0007
F. T. Kubatík, J. Stoulil, F. Lukáč, K. Stehlíková, P. Slepička
Abstract This work presents the preparation of coatings of aluminium and AlCr6Fe2 alloy on magnesium alloy AZ91 with metallurgical bonding. Coatings were prepared by plasma spraying system WSP®-H 500. This metallurgical bond (sub-layer) is formed by an eutectic structure consisting of the intermetallic phase Mg17Al12 and the solid solution of magnesium and aluminium. In this work, the layers were studied using electrochemical impedance spectroscopy (EIS). It was shown that there is a several fold increase of the polarization resistance (Rcν) of plasma-sprayed coatings of aluminium and AlCr6Fe2 alloy, compared with uncoated AZ91 in borate buffer with pH 9.1.
本文介绍了在镁合金AZ91上用冶金结合法制备铝和AlCr6Fe2合金涂层。采用等离子喷涂系统WSP®-H500制备涂层。这种冶金结合(子层)是由金属间相Mg17Al12和镁和铝的固溶体组成的共晶结构形成的。在这项工作中,使用电化学阻抗谱(EIS)对这些层进行了研究。结果表明,在pH 9.1的硼酸盐缓冲液中,与未涂覆的AZ91相比,铝和AlCr6Fe2合金的等离子喷涂涂层的极化电阻(RcΓ)增加了数倍。
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引用次数: 0
Influence of the adhesive type and metal substrate on adhesion of bonded joints after salt spray test 盐雾试验后胶粘剂类型和金属基材对粘结接头附着力的影响
Q3 Materials Science Pub Date : 2018-05-01 DOI: 10.1515/kom-2018-0006
K. Machalická, P. Pokorný, M. Vokáč
Abstract This article was focused on the evaluation of neutral salt spray test effect (according to ISO 9124), procedure E4, on mechanical properties of load-bearing adhesive joints. The study also comprises the influence of substrate material (mild steel, aluminum alloys) and substrate surface roughness (verified by optical confocal microscopy). The experimental program contained acrylate-based adhesive and hybrid silicone polyurethane based adhesive which were applied in double lap joints loaded by shear.
摘要本文主要研究了中性盐雾试验(ISO 9124)程序E4对承载胶粘剂接头力学性能的评价效果。该研究还包括衬底材料(低碳钢,铝合金)和衬底表面粗糙度的影响(通过光学共聚焦显微镜验证)。实验方案包括丙烯酸酯基胶粘剂和混合硅基聚氨酯基胶粘剂,分别应用于剪切载荷下的双搭接接头。
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引用次数: 2
Influence of soil microorganisms on metal corrosion of underground pipelines 土壤微生物对地下管线金属腐蚀的影响
Q3 Materials Science Pub Date : 2018-05-01 DOI: 10.1515/kom-2018-0009
M. Polutrenko, P. Maruschak, A. Tymoshenko, A. Sorochak
Abstract There have been revealed and summarized the regularities in biocorrosion of steel 17G1S-U, which is traditionally used for manufacturing oil and gas mains. The basic regularities of biocorrosion processes in the 17G1S-U pipe steel under the influence of SRB Desulfovibrio Sp. strains Kyiv-10 was obtained by weight-loss testing and surface analysis techniques. Effective inhibitors are proposed, which allow protecting steel 17G1S-U against the development of anaerobic corrosion under the influence of sulfate-reducing bacteria (SRB). The effectiveness of inhibitors is estimated by the degree of their protective effect. The porous structure of the surface film contributes to the initiation of localized corrosion. Damage analysis of the specimen surface corroded under different test conditions was performed.
摘要本文揭示和总结了传统油气管道用钢17gs - u的生物腐蚀规律。通过失重试验和表面分析技术,获得了SRB Desulfovibrio Sp.菌株Kyiv-10对17G1S-U管钢生物腐蚀过程的基本规律。提出了有效的抑制剂,可以保护钢17G1S-U免受硫酸盐还原菌(SRB)影响下厌氧腐蚀的发展。抑制剂的有效性是通过其保护作用的程度来估计的。表面膜的多孔结构有助于引发局部腐蚀。对试样在不同试验条件下的表面腐蚀进行了损伤分析。
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引用次数: 9
Effect of combined surface treatment on quality and electrochemical corrosion properties of manganese phosphate on hsla steel domex 700 复合表面处理对磷酸锰对高强度低合金钢domex700质量及电化学腐蚀性能的影响
Q3 Materials Science Pub Date : 2018-05-01 DOI: 10.1515/kom-2018-0008
K. Borko, F. Pastorek, Jacková M. Neslušan, S. Fintová, B. Hadzima
Abstract The actual industrial trend is focused on weight reduction of constructions while preserving strength properties. For this purpose, conventional steel are replaced by high strength steels.. The aim of this study was to evaluate the effects of mechanical surface pre-treatment on corrosion resistance of high strength low alloy steel Domex 700 before and after surface treatment by manganese phosphating. Tested environment was 0,1M NaCl solution. Evaluation of mechanical pre-treatment and phosphating effects on corrosion resistance was realized by electrochemical measurements: potentiodynamic polarization measurements (Tafel analysis) and electrochemical impedance spectroscopy (equivalent circuits). From resulsts it is possible to conclude, that creation of manganese phosphate layer on ground and shot peened steel surface significantly increases the corrosion resistance of Domex 700 steel.
实际的工业发展趋势是在保持结构强度的同时减轻结构的重量。为此目的,高强度钢取代了传统钢。本研究的目的是评价机械表面预处理对高强度低合金钢Domex 700表面锰磷化处理前后耐蚀性的影响。测试环境为0.1 m NaCl溶液。通过电化学测量:动电位极化测量(Tafel分析)和电化学阻抗谱(等效电路)来评价机械预处理和磷化对耐蚀性的影响。从结果可以得出结论,在地面和喷丸钢表面形成的磷酸锰层显著提高了Domex 700钢的耐腐蚀性。
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引用次数: 1
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Koroze a ochrana materialu
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