Koroze a ochrana materialu最新文献

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Evolution of microstructure and electrochemical corrosion characteristics of cold compacted magnesium 冷压镁的微观结构演变及电化学腐蚀特性
Koroze a ochrana materialu Pub Date : 2017-10-26 DOI: 10.1515/kom-2017-0015
M. Březina, P. Doležal, M. Krystýnová, J. Minda, J. Zapletal, S. Fintová, J. Wasserbauer
{"title":"Evolution of microstructure and electrochemical corrosion characteristics of cold compacted magnesium","authors":"M. Březina, P. Doležal, M. Krystýnová, J. Minda, J. Zapletal, S. Fintová, J. Wasserbauer","doi":"10.1515/kom-2017-0015","DOIUrl":"https://doi.org/10.1515/kom-2017-0015","url":null,"abstract":"Abstract The main advantage of magnesium and its alloys is high specific strength and biocompatibility. A modern approach to magnesium-based materials preparation is powder metallurgy. This technique allows preparation of new materials with a unique structure, chemical composition, and controlled porosity. In this study, cold compaction of magnesium powder was studied. Magnesium powder of average particle size of 30 μm was compacted applying pressures of 100 MPa, 200 MPa, 300 MPa, 400 MPa and 500 MPa at laboratory temperature. Influence of compacting pressure was studied with microstructural and electrochemical corrosion characteristics analysis. The resulting microstructure was studied in terms of light and electron microscopy. Obtained electrochemical characteristics were compared with those of wrought magnesium. Compacting pressure had a significant influence on microstructure and electrochemical characteristics of prepared bulk magnesium. With the increase in compaction pressure, the porosity decreased. Compacting pressures of 300 MPa, 400 MPa and 500 MPa led to the similar microstructure of the prepared material. Polarization resistance of compacted magnesium was much lower and samples degraded faster when compared to wrought magnesium. Also, the corrosion degradation mechanism changed due to the microstructural differences between the material states.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43862728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Mechanisms of degradation of organic coatings 有机涂层的降解机理
Koroze a ochrana materialu Pub Date : 2017-10-26 DOI: 10.1515/kom-2017-0019
T. Prošek
{"title":"Mechanisms of degradation of organic coatings","authors":"T. Prošek","doi":"10.1515/kom-2017-0019","DOIUrl":"https://doi.org/10.1515/kom-2017-0019","url":null,"abstract":"Abstract An overview of protection mechanisms of organic coatings for metallic constructions and products is given. The barrier effect of coatings and protection in local defects are discussed. Basic degradation mechanisms of organic coatings such as anodic and cathodic delamination in vicinity of defects, osmotic and cathodic blistering, mechanical stress assisted blistering, loss of adhesion and chalking are described. Appropriate laboratory tests are proposed for each degradation mode.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44333147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Study of damage extent to glass fibre in glass-fibre fabric reinforcement during exposure simulating concrete pore solution 模拟混凝土孔隙溶液暴露过程中玻璃纤维布加固中玻璃纤维的损伤程度研究
Koroze a ochrana materialu Pub Date : 2017-10-26 DOI: 10.1515/kom-2017-0016
P. Pokorný, P. Bouška, T. Bittner, J. Kolísko, M. Vokáč, T. Mandlík, J. Müllerová
{"title":"Study of damage extent to glass fibre in glass-fibre fabric reinforcement during exposure simulating concrete pore solution","authors":"P. Pokorný, P. Bouška, T. Bittner, J. Kolísko, M. Vokáč, T. Mandlík, J. Müllerová","doi":"10.1515/kom-2017-0016","DOIUrl":"https://doi.org/10.1515/kom-2017-0016","url":null,"abstract":"Abstract The paper evaluates extent of corrosion damage to composite glass-fibre fabric reinforcement in environment simulating concrete pore solutions (pH 12.6, 13.0, 13.5) and carbonated concrete contaminated with chlorides (pH 8.1 + Cl-) using the FT-IR and SEM/EDS techniques. Also, the effect of corrosion damage on tensile strength of segmented glass fibre as well as the presence of specific protective organic coating on glass fibre were studied. The results demonstrate local corrosion damage of samples at pH 13.5 and on the other hand high stability in environment simulating carbonated concrete and carbonated concrete contaminated with chlorides. The study also suggests unevenness of organic coating with occurrence of localized porosity which is related to aforementioned corrosion damage. Corrosion damage in FT-IR spectra manifests by changes in peaks signalling hydrolysis of protective organic coating and occurrence of peaks suggesting presence of Ca2+ rich corrosion products.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45768675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Copper and copper patina 铜和铜光泽
Koroze a ochrana materialu Pub Date : 2017-07-26 DOI: 10.1515/kom-2017-0014
P. Rak, R. Bureš
{"title":"Copper and copper patina","authors":"P. Rak, R. Bureš","doi":"10.1515/kom-2017-0014","DOIUrl":"https://doi.org/10.1515/kom-2017-0014","url":null,"abstract":"Abstract This article is aimed at summarizing knowledge about copper and patina that is formed on the surface of copper. The article describes chemical processes in patina formation and explains the difference between natural and artificial patina, as well as some methods used in the investigation of patina such as XRD analysis, EIS analysis, Raman spectroscopy","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46988917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Inspection possibilities of metallic material surface integrity by conventional ultrasonic technique 传统超声技术检测金属材料表面完整性的可能性
Koroze a ochrana materialu Pub Date : 2017-07-26 DOI: 10.1515/kom-2017-0011
R. Koňar, M. Mičian, P. Fábián
{"title":"Inspection possibilities of metallic material surface integrity by conventional ultrasonic technique","authors":"R. Koňar, M. Mičian, P. Fábián","doi":"10.1515/kom-2017-0011","DOIUrl":"https://doi.org/10.1515/kom-2017-0011","url":null,"abstract":"Abstract The article is focused on the possibilities of ultrasound surfaces control on metallic materials by conventional ultrasonic techniques. Physical principles, types of ultrasonic waves to be used for surface control are described in the theoretical part. Three surface control techniques are listed in the experimental part of article. The first technique is a common control by angle ultrasonic probe with using transverse waves. The second technique is surface control by 30-70-70 creep waves and third techniques is surface testing by Rayleigh waves. Practical examples of ultrasonic testing for all techniques are illustrated. The conclusion of the article is devoted to the advantages and limitations of the individual testing methods.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45135517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The tribological properties of Al-brasses in various environments Al黄铜在不同环境中的摩擦学性能
Koroze a ochrana materialu Pub Date : 2017-07-26 DOI: 10.1515/kom-2017-0010
M. Lovíšek, T. Liptáková, J. Bronček, S. Dundeková
{"title":"The tribological properties of Al-brasses in various environments","authors":"M. Lovíšek, T. Liptáková, J. Bronček, S. Dundeková","doi":"10.1515/kom-2017-0010","DOIUrl":"https://doi.org/10.1515/kom-2017-0010","url":null,"abstract":"Abstract Tribological properties of Al-brass pipes of various producers were studied in different environments. The tested brasses have very similar chemical composition, but they differ in microstructure due to mainly by heat treatment after cold drawing. Microstructure as well as roughness of surface influence chemical and mechanical properties which are important in operating conditions. The experiments of tribological behavior were made in various environments, dry air, cooling treated water and 3.5 % solution of NaCl at room temperature 21 ± 2°C. The tribological tests were carried out on the Linear Tribometer at normal loading 5 N by the method ball on plate for the duration of 5500 s. The measured friction coefficients were evaluated by the program DIAdem and the diagrams were created from signal generated by software NSignal Express","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47316861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The influence of deformation on the corrosion properties of the material 变形对材料腐蚀性能的影响
Koroze a ochrana materialu Pub Date : 2017-07-26 DOI: 10.1515/kom-2017-0009
M. Novakova, O. Chocholatý, A. Kříž
{"title":"The influence of deformation on the corrosion properties of the material","authors":"M. Novakova, O. Chocholatý, A. Kříž","doi":"10.1515/kom-2017-0009","DOIUrl":"https://doi.org/10.1515/kom-2017-0009","url":null,"abstract":"Abstract This work was focused on changes of corrosion behaviour influence of deformation. The This work focuses on changes in corrosion behaviour under the influence of deformation. The main purpose is to observe the changes caused by tensile stress. The experimental material used is steel 1.4301 and titanium GRADE 2. The measurements were carried out using a potentiostat, which measures potential changes over time and electric current. The electrolyte used was 3.5% NaCl. Corrosion properties, especially polarization resistance, corrosion potential and corrosion rate, were evaluated from the measurements. The results demonstrate the changing corrosion properties depending on deformation. The corrosion properties worsened as the deformation increased.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41957933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Anticorrosive efficiency of alkyd resin-based coatings containing Mg–Zn–Fe mixed oxide-based pigments 含Mg-Zn-Fe混合氧化物基颜料醇酸树脂基涂料的防腐性能
Koroze a ochrana materialu Pub Date : 2017-04-01 DOI: 10.1515/kom-2017-0005
A. Kalendová, E. Halecká, K. Nechvílová, M. Kohl
{"title":"Anticorrosive efficiency of alkyd resin-based coatings containing Mg–Zn–Fe mixed oxide-based pigments","authors":"A. Kalendová, E. Halecká, K. Nechvílová, M. Kohl","doi":"10.1515/kom-2017-0005","DOIUrl":"https://doi.org/10.1515/kom-2017-0005","url":null,"abstract":"Abstract Mixed oxide-based pigments Mg–Zn–Fe with different particle morphologies were prepared by high-temperature solid phase reactions. The core shell pigments containing ferric oxide and non-isometric particles of layered silicates were also prepared. The pigments were tested in paints, the pigment volume concentrations in the modified alkyd resin based binder being 5%, 10%, and 15%. The paint properties were examined by accelerated corrosion tests and by physico-mechanical tests. The effect of the pigment particle morphology on the surface hardness of the paint films was also studied. The influence of pigment volume concentration on the coating properties, and the optimum concentrations providing the most efficient anticorrosive protection were processed. A higher anticorrosion efficiency was observed for the paints with pigments possessing the lamellar particle shape.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43181706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Atmospheric corrosion models 大气腐蚀模型
Koroze a ochrana materialu Pub Date : 2017-04-01 DOI: 10.1515/kom-2017-0007
K. Kreislová, H. Geiplová, Z. Barták, D. Majtás
{"title":"Atmospheric corrosion models","authors":"K. Kreislová, H. Geiplová, Z. Barták, D. Majtás","doi":"10.1515/kom-2017-0007","DOIUrl":"https://doi.org/10.1515/kom-2017-0007","url":null,"abstract":"Abstract A number of damage functions or dose-response equation, which are compared to the atmospheric corrosion of metals with environmental parameters, have been determined in field programs ISOCORRAG, UN ECE ICP Materials Exposure Programme and Multi-Assess. The all of these dose-response equations are derived on field exposure results performed during period 1986-1995 where the SO2 level was relative high at urban and very high at industrial test sites. Several exposure programmes, national and international, of structural metals’ atmospheric corrosion were conducted since the 1970s on Czech atmospheric test sites including on-site measurement of environmental data. All data from these exposure programs were compared with prediction models.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41269487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Electrodeposition of multicomponent Co–Cr–Fe–Mn–Ni alloy 多组分Co-Cr-Fe-Mn-Ni合金的电沉积
Koroze a ochrana materialu Pub Date : 2017-04-01 DOI: 10.1515/kom-2017-0006
S. Ivanova, J. Bárta, M. Pazderová
{"title":"Electrodeposition of multicomponent Co–Cr–Fe–Mn–Ni alloy","authors":"S. Ivanova, J. Bárta, M. Pazderová","doi":"10.1515/kom-2017-0006","DOIUrl":"https://doi.org/10.1515/kom-2017-0006","url":null,"abstract":"Abstract This work is focused on the initial realization of a multi-component coating deposition from the aqueous solution. The Coating composed of the elements Co-Cr-Fe-Mn-Ni was prepared by electroplating process. The chosen substrate was copper. The purpose of the work was to apply the high entropy alloy, which is defined as alloy with structure of a solid solution containing five or more elements in an approximately equal atomic ratio. The use of electrodeposition in this area is rare. The conditions of the plating process, the percentage of the metal ions and cohesion of the layers were studied. The morphology of the excluded coatings was monitored by scanning electron microscopy and their elemental composition was verified by the EDS analysis. The wear resistant features were examined approximately before and consequently also after the thermal resistance testing.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/kom-2017-0006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45743843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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