Koroze a ochrana materialu最新文献_第4页

Corrosion studies on XD3 reinforced concrete samples prepared by using calcium nitrate as inorganic corrosion inhibitor with different superplasticizers 以硝酸钙为无机缓蚀剂与不同减水剂制备的XD3钢筋混凝土试样的腐蚀研究

Koroze a ochrana materialu Pub Date : 2020-03-01 DOI: 10.2478/kom-2020-0002

S. A. Abdulsada, R. Bak, A. Heczel, T. Török

{"title":"Corrosion studies on XD3 reinforced concrete samples prepared by using calcium nitrate as inorganic corrosion inhibitor with different superplasticizers","authors":"S. A. Abdulsada, R. Bak, A. Heczel, T. Török","doi":"10.2478/kom-2020-0002","DOIUrl":"https://doi.org/10.2478/kom-2020-0002","url":null,"abstract":"Abstract This research paper presents an analysis of the corrosion properties of steel-reinforced concrete samples during immersion in 3.5 wt. % NaCl aqueous solution by measuring their response both cathodic and anodic polarization in order to determine the corrosion rates in the function of their calcium nitrate inhibitor content. This cheap inorganic inhibitor was added to the concrete mix in concentrations of 1% and 3% by weight of cement in addition to two different superplasticizers (MapeiDynamon SR 31 and Oxydtron). The compressive strengths of the so prepared samples were also checked according to the relevant European standard and were within the acceptable limits, so this inhibitor does not weaken this important property of the concrete samples. The test results on steel reinforced samples immersed in 3.5 wt. % NaCl aqueous solutions at room temperature showed promising corrosion mitigating effects just after 6 months testing period. After 6 months the lower corrosion currents (i.e. better corrosion resistance) for both types of superplasticizers were observed with those samples which contained 3% calcium nitrate inhibitor. The best result was observed with sample C4 (in this case 3% calcium nitrate was added to the mixture of cement+Oxydtron superplasticizer). The advantageous inhibition mechanism of nitrate anions is also discussed and interpreted.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"11 - 18"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46357370","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

Characterization of AZ31-NbC surface composite fabricated by friction stir processing 搅拌摩擦法制备AZ31-NbC表面复合材料的表征

Koroze a ochrana materialu Pub Date : 2020-03-01 DOI: 10.2478/kom-2020-0005

M. Muralimanokar, Vignesh R. Vaira, R. Padmanaban, P. Suganya

{"title":"Characterization of AZ31-NbC surface composite fabricated by friction stir processing","authors":"M. Muralimanokar, Vignesh R. Vaira, R. Padmanaban, P. Suganya","doi":"10.2478/kom-2020-0005","DOIUrl":"https://doi.org/10.2478/kom-2020-0005","url":null,"abstract":"Abstract AZ31D magnesium alloy is widely used in automotive, aircraft, and aerospace applications because of its high strength to weight ratio. However, the softness of the alloy results in higher wear rate and the high activity results in higher corrosion rate. With an aim of reducing the wear rate and corrosion rate of AZ31 alloy, surface composite of AZ31 alloy is fabricated by reinforcing niobium carbide (NbC) by friction stir processing. The microstructure and dispersion of the reinforcements in AZ31-NbC surface composite is analysed by optical microscopy. In addition, the microhardness and tribological characteristics of the developed AZ31-NbC surface composite are investigated. The results demonstrated an increase in microhardness (23.2 %) and the decrease in wear rate (15.6 % for a normal load of 2 kg) in the developed AZ31-NbC surface composite with respect to the base material. The immersion corrosion test was performed to analyse the corrosion rate of the developed AZ31-NbC surface composite in simulated sea water environment (3.5 wt % NaCl solution). The results indicate that the corrosion rate of the developed AZ31-NbC surface composite is higher than that of base material. A comprehensive analysis on the wear and corrosion mechanism of the developed AZ31-NbC surface composite is presented.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"29 - 37"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46459658","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

Mechanical and corrosion properties of iron-mangan materials sintered in the presence of plasma 等离子体烧结铁锰材料的力学性能和腐蚀性能

Koroze a ochrana materialu Pub Date : 2020-03-01 DOI: 10.2478/kom-2020-0001

Králová Z. Orságová, M. Kupková, M. Hrubovčáková, A. Zelenák, R. Oriňaková, Turoňová A. Morovská, K. Žáková, M. Kupka, K. Koval, I. Šišoláková

引用次数: 0

Corrosion resistance of the biodegradable ZE41 magnesium alloy treated by unconventional fluoride conversion coating 非常规氟化物转化涂层处理生物可降解ZE41镁合金的耐蚀性

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI: 10.2478/kom-2019-0018

J. Drábiková, S. Fintová, P. Doležal, J. Wasserbauer, Z. Florková

{"title":"Corrosion resistance of the biodegradable ZE41 magnesium alloy treated by unconventional fluoride conversion coating","authors":"J. Drábiková, S. Fintová, P. Doležal, J. Wasserbauer, Z. Florková","doi":"10.2478/kom-2019-0018","DOIUrl":"https://doi.org/10.2478/kom-2019-0018","url":null,"abstract":"Abstract Magnesium based alloys are very promising material to be used mainly for biodegradable implants in medical applications. However, due to their very low corrosion resistance in the environment of in vivo is their use limited. Increase of the corrosion resistance of magnesium alloys in vivo can be achieved, for example, by a suitable choice of surface treatment while the biocompatibility must be ensured. Fluoride conversion coatings meet these requirements. Unconventional fluoride conversion coating was prepared on ZE41 magnesium alloy by dipping the magnesium alloy into the Na[BF4] salt melt at 450 °C for 0.5; 2 and 8 h. The morphology and thickness of the prepared fluoride conversion coatings were investigated as well as the corrosion resistance of the treated and untreated ZE41 magnesium alloy specimens. The corrosion resistance of the untreated and treated ZE41 magnesium alloy was investigated using electrochemical impedance spectroscopy in the environment of the simulated body fluids at 37 ± 2 °C. The obtained results showed a positive influence of the fluoride conversion coating on the corrosion resistance of the ZE41 magnesium alloy.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"63 1","pages":"138 - 147"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41630023","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

Characterization of selected properties of WC–WB–Co and WC–FeCrAl coatings applied by HVOF technology 采用HVOF技术制备WC-WB-Co和WC-FeCrAl涂层

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI: 10.2478/kom-2019-0022

J. Brezinová, A. Guzanová, D. Draganovská, J. Březina

引用次数: 1

Evaluation of selected properties of coatings in respect of risk elimination of surface damage of stamped parts 关于消除冲压件表面损伤风险的涂层选定性能的评价

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI: 10.2478/kom-2019-0021

J. Tkáčová, E. Zdravecká, E. Evin, M. Tomáš, D. Jakubéczyová

引用次数: 2

Impact of corrosion product removal to depth of corrosion damage in weldment joint 腐蚀产物去除对焊件接头腐蚀损伤深度的影响

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI: 10.2478/kom-2019-0019

J. Hodač, Z. Fulin

{"title":"Impact of corrosion product removal to depth of corrosion damage in weldment joint","authors":"J. Hodač, Z. Fulin","doi":"10.2478/kom-2019-0019","DOIUrl":"https://doi.org/10.2478/kom-2019-0019","url":null,"abstract":"Abstract Corrosion flaws in pipelines can caused severe financial losses and also can be dangerous for people. One of the most frequently damaged parts are dissimilar pipe welds. We would like to understand how corrosion process reacts on corrosion product removal. Outputs from experiment will be used for production of test specimens. For testing we chose standard dissimilar weldment used in Czech power plants. It is joint with 08Ch18N10T and 22K (GOST) steel. Joint is cut to 24 same specimens. There are exposed to flowing water solution of 5% NaCl. Half of the specimens are regularly mechanically cleaned. The joint is metallographically observed and parts with and without corrosion products are compared. Water salt solution increased pH from 7,25 to 7,86 during 31 days test and conductivity varies around 74 mS cm−1. Metallographic observation indicates that corrosion under corrosion products layer is locally speed up and causes pitting corrosion. Cleaned specimens indicate plane corrosion with lower depth. These results indicate that slag in pipeline could locally speed up corrosion depth penetration. On the other hand, solutions with abrasive particles (which can wipe out the corrosion product) will probably facilitate plane corrosion damage on pipeline walls. This test brings us another knowledge, how to simulate realistic corrosion damage for production of NDT qualification test pieces.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"63 1","pages":"148 - 152"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46524415","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

Anticorrosion coatings based on novel acrylate binders containing MeO nanoparticles 含MeO纳米颗粒的新型丙烯酸酯粘结剂的防腐涂料

Koroze a ochrana materialu Pub Date : 2019-12-01 DOI: 10.2478/kom-2019-0020

D. Steinerová, A. Kalendová, J. Machotová, M. Kohl

{"title":"Anticorrosion coatings based on novel acrylate binders containing MeO nanoparticles","authors":"D. Steinerová, A. Kalendová, J. Machotová, M. Kohl","doi":"10.2478/kom-2019-0020","DOIUrl":"https://doi.org/10.2478/kom-2019-0020","url":null,"abstract":"Abstract Water based paints are increasingly attracting interest mainly with a view to reducing air pollution with volatile organic compounds (VOC). However, the protective properties of water-based paints are inferior to those of solvent-based paints and so new ways to increase the resistance of water-based systems are sought. The present contribution describes the preparation and testing of environmentally friendly anti-corrosion paints based on novel water-based self-crosslinking acrylate latexes containing appropriate pigments and ZnO or MgO nanoparticles at a concentration of 1.5 % (with respect to the monomers) compared to the same systems free from the nanoparticles. Both the effect of the MeO nanoparticles and the effects of the pigment species and particle shapes on the paint film properties were examined. The MeO nanoparticles were found to improve all the properties tested. The latexes with MgO exhibited the highest resistance to flash corrosion while the latexes with ZnO exhibited the highest anticorrosion resistance. Furthermore, the systems with the calcium-aluminium polyphosphosilicate based pigment were superior to all the remaining systems in this respect. It is concluded that binders with nanoparticles can be used as a basis for anticorrosion coatings provided that a suitable pigment is selected.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"63 1","pages":"153 - 158"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69228456","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

Corrosion and corrosion inhibition in an environment of ethanol – gasoline blends 乙醇-汽油混合物环境中的腐蚀和缓蚀

Koroze a ochrana materialu Pub Date : 2019-11-01 DOI: 10.2478/kom-2019-0016

L. Matějovský, O. Pleyer, J. Macák

{"title":"Corrosion and corrosion inhibition in an environment of ethanol – gasoline blends","authors":"L. Matějovský, O. Pleyer, J. Macák","doi":"10.2478/kom-2019-0016","DOIUrl":"https://doi.org/10.2478/kom-2019-0016","url":null,"abstract":"Abstract Ethanol produced from renewable resources is considered as an ecological substitute for a fossil gasoline. Ethanol blended with the fossil gasoline is able to significantly change the properties of the blended fuel as polarity, conductivity, ability to absorb air humidity and ability to dissolve a high percentage of water etc. All these properties are growing with an increasing content of ethanol and all of them can cause higher corrosivity of blended fuel. Material compatibility of metalic construction materials of the vehicle fuel system is also decreased in the environment of ethanol – gasoline blends (EGB’s). Furthermore, components of production, transport and storage equipment may be at risk of corrosion. EGB’s with an ethanol content of about 60% vol. show high corrosive aggressivness, especially if they are contaminated with water and trace amounts of ion, which may occur if proper storage, transport and production conditions are violated. Losses caused by corrosion of equipment may be prevented by using of suitable additive. Diethylenetriamine (DETA) can be used as such additive for the mild steel which is one of the most commonly used construction material. When DETA is used, it shows very high efficiency.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"63 1","pages":"121 - 129"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49221083","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

Corrosion-mechanical behavior of gas main steel in saline soils 含气主钢在盐渍土中的腐蚀力学行为

Koroze a ochrana materialu Pub Date : 2019-11-01 DOI: 10.2478/kom-2019-0014

L. Poberezhny, A. Stanetsky, G. Grytsuliak, L. Poberezhna, M. Kosmii, A. Hrytsanchuk

引用次数: 4