Koroze a ochrana materialu最新文献_第3页

Testing of pilot 2 m3 exposure chamber for formation of brochantite based patina on copper and copper alloys – objects of practical dimensions 在铜和铜合金上形成铜辉石基铜绿的试验2立方米暴露室的试验。实用尺寸的物体

Koroze a ochrana materialu Pub Date : 2020-10-01 DOI: 10.2478/kom-2020-0014

R. Bureš, P. Rak, J. Stoulil

引用次数: 1

Corrosion characteristics of sintered heterogeneous materials composed of iron and iron oxides 由铁和氧化铁组成的烧结非均相材料的腐蚀特性

Koroze a ochrana materialu Pub Date : 2020-10-01 DOI: 10.2478/kom-2020-0011

M. Kupková, M. Kupka, R. Oriňaková, R. Gorejová

{"title":"Corrosion characteristics of sintered heterogeneous materials composed of iron and iron oxides","authors":"M. Kupková, M. Kupka, R. Oriňaková, R. Gorejová","doi":"10.2478/kom-2020-0011","DOIUrl":"https://doi.org/10.2478/kom-2020-0011","url":null,"abstract":"Abstract In a coronary angioplasty or orthopaedic surgery, metallic implants are often used to provide mechanical support to the healing tissues. In some situations, this support is really needed only temporarily. After tissue recovery, the implant no longer provides any benefits and can trigger adverse reactions. An optimal solution might be the short-term implants which are able to decompose in situ and can be readily excreted from the body. Iron-based materials are promising candidates for application in biodegradable devices. For the successful application, the ability to control the material’s corrosion rate is important. In this contribution, the corrosion of iron-iron oxide composites is investigated. In order to obtain such materials, iron-oxide granules were incompletely reduced, compacted and sintered. Materials consisting of a pure iron and iron oxides were obtained. Specimens from as-sintered materials and materials reduced once again after sintering were prepared. Potentiodynamic polarization testing in Hanks’ solution indicated that specimens underwent a galvanic corrosion, where the release of ferrous ions from iron surfaces represents the anodic reaction and the oxygen reduction on surfaces of both iron and iron oxides represents the cathodic reaction. Changes in the content of oxides resulted in anticipated shifts in corrosion potential and apparent corrosion current density.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"72 - 78"},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45267221","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

Use of ultrasound for cleaning of components of historical vehicles in Technical Museum in Brno 在布尔诺技术博物馆使用超声波清洗历史车辆部件

Koroze a ochrana materialu Pub Date : 2020-10-01 DOI: 10.2478/kom-2020-0012

K. Rapouch, M. Mrázek

引用次数: 0

Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments 拖拉机挂车金属材料在侵蚀环境中的腐蚀疲劳失效

Koroze a ochrana materialu Pub Date : 2020-06-01 DOI: 10.2478/kom-2020-0007

P. Popovych, L. Poberezhny, O. Shevchuk, I. Murovanyi, L. Poberezhna, A. Hrytsanchuk, Y. Koval

{"title":"Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments","authors":"P. Popovych, L. Poberezhny, O. Shevchuk, I. Murovanyi, L. Poberezhna, A. Hrytsanchuk, Y. Koval","doi":"10.2478/kom-2020-0007","DOIUrl":"https://doi.org/10.2478/kom-2020-0007","url":null,"abstract":"Abstract The processes of corrosion-fatigue failure of materials in contact with mineral fertilizers are insufficiently studied. As a result of joint influence of atmospheric corrosion and mechanical loads, about 70 to 80 % of machine parts get out of order, 20 to 25 % of which are failures caused by operating overload due to the strength loss because of atmospheric corrosion. A large part of metal structures of agricultural vehicles used to transport mineral fertilizers is under the direct influence of aggressive environments and dynamic loads that occur during the motion by field roads. Saturated solutions of the most aggressive working environments used in agricultural production, in particular ammonium sulphate and nitrophosphate are investigated to reduce fatigue resistance of ordinary steels groups – St3 and St5 and quality steels – 10 Steel, 15 Steel, 20 Steel, 25 Steel when loaded at all levels. The fatigue endurance limit decreases in comparison with air up to 2.02 times in a solution of ammonium sulphate, and to 2.32 times in a solution of nitrophosphate. In organic fertilizer environments, compared to distilled water, the conditional fatigue endurance limit increased to 9 %. The properties of the given materials as an inhibitor of corrosion-fatigue failure were discovered and proved.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"45 - 51"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45596703","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: 5

Use of non-destructive eddy current technique to detect simulated corrosion of aircraft structures 利用非破坏性涡流技术检测飞机结构的模拟腐蚀

Koroze a ochrana materialu Pub Date : 2020-06-01 DOI: 10.2478/kom-2020-0008

M. Janovec, J. Čerňan, F. Škultéty

{"title":"Use of non-destructive eddy current technique to detect simulated corrosion of aircraft structures","authors":"M. Janovec, J. Čerňan, F. Škultéty","doi":"10.2478/kom-2020-0008","DOIUrl":"https://doi.org/10.2478/kom-2020-0008","url":null,"abstract":"Abstract The article deals with the issue of non-destructive testing of riveted joints. In the article, the authors used a non-destructive eddy current array technique, which was applied to detect simulated corrosion in the field of aircraft riveted joints of aluminum sheets. In aircraft maintenance, the eddy current method is used to control the outer surface of the aircraft skin, especially the areas around the riveted joints. This method makes it possible to detect hidden cracks and corrosion that may occur during aircraft operation. Especially hidden are hidden cracks and corrosion of aircraft structures, which cannot be detected during a visual inspection of the aircraft. The aim of the experimental measurements was to reveal simulated corrosion in the area of riveted joints formed on the experimental sample. Corrosion was simulated by gluing aluminum powder to the surface of the aluminum sheets from which the sample was made. The simulated corrosion in the second and third layers of the riveted sample was reliably detected. The settings, the method of control and the results of measurements are given in the article in the experimental part and the results of measurements. Measurements were performed using a defectoscope with an ECA measurement module, with appropriate measuring probes suitable for this type of inspection.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"52 - 58"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42191071","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

Corrosion inhibition of mild steel using novel pyridine derivative in 1 M hydrochloric acid 新型吡啶衍生物对低碳钢在1m盐酸中的缓蚀作用

Koroze a ochrana materialu Pub Date : 2020-06-01 DOI: 10.2478/kom-2020-0009

A. Al-amiery, L. M. Shaker

引用次数: 20

Chemical resistance of NR/SBR rubber blends for surfaces corrosion protection of metallic tanks in petrochemical industries 石油化工金属储罐表面防腐用NR/SBR共混橡胶的耐化学性

Koroze a ochrana materialu Pub Date : 2020-06-01 DOI: 10.2478/kom-2020-0010

A. Braihi, A. Jawad, A. Kadhum, H. S. Aljibori, A. Al-amiery

{"title":"Chemical resistance of NR/SBR rubber blends for surfaces corrosion protection of metallic tanks in petrochemical industries","authors":"A. Braihi, A. Jawad, A. Kadhum, H. S. Aljibori, A. Al-amiery","doi":"10.2478/kom-2020-0010","DOIUrl":"https://doi.org/10.2478/kom-2020-0010","url":null,"abstract":"Abstract In this work, a series of Natural Rubber (NR)/Styrene Butadiene Rubber (SBR) blends were formulated to protect metallic petrochemical storage tanks from corrosive media. Therefore, these blends tested against a 10% HCl solution for 72 hr at room temperature. Blends series were prepared with different ratios of NR/SBR; 25/75, 30/70, 35/65, 40/60, 45/55, 50/50, and 55/45. Three types of carbon black (N-330, N-660, and N-762) were added individually to the 45/55 blend. Hardness, tensile strength, modulus, and elongation properties were tested before and after immersion in the 10% HCl attack media. All these mechanical properties decreased after immersion action accept hardness property. Up to 45 phr NR content, the hardness increased linearly independent on immersion action, but HCl immersion gives higher hardness values. Tensile strength increased up to 40 phr NR content with and without immersion and the immersion action decreased tensile values. The highest elongation value obtained with 35/65 blend with and without immersion. The 45 phr NR content gives the higher modulus, while the lowest value obtained with the 30 phhr content. For 45/55 blend, the hardness increased as the carbon black particle size decreased and immersion action gives higher hardness values. The tensile strength decreased linearly with the carbon black surface area, while with the medium surface area, the highest modulus and lowest elongation obtained.","PeriodicalId":17911,"journal":{"name":"Koroze a ochrana materialu","volume":"64 1","pages":"65 - 71"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48301985","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: 8

The corrosion-resistant Ni-based coatings and their tribological properties 耐腐蚀镍基涂层及其摩擦学性能

Koroze a ochrana materialu Pub Date : 2020-06-01 DOI: 10.2478/kom-2020-0006

E. Zdravecká, J. Tkáčová

引用次数: 1

Development of corrosion flaws for the production of realistic test specimens 用于生产真实试样的腐蚀缺陷的开发

Koroze a ochrana materialu Pub Date : 2020-03-01 DOI: 10.2478/kom-2020-0004

J. Hodač, Z. Fulin, P. Mareš, J. Veselá, O. Chocholatý

引用次数: 0

Monitoring of corrosive environment aggressiveness and development of a sensor for monitoring of the water film in exposure chamber 腐蚀环境侵袭性监测及曝光室水膜监测传感器的研制

Koroze a ochrana materialu Pub Date : 2020-03-01 DOI: 10.2478/kom-2020-0003

R. Bures, P. Rak, J. Stoulil

引用次数: 1