Practice of Anticorrosive Protection最新文献_第7页

Influence of cathodic polarization on the properties of epoxy powder coatings 阴极极化对环氧粉末涂料性能的影响

Practice of Anticorrosive Protection Pub Date : 2019-12-01 DOI: 10.31615/j.corros.prot.2019.94.4-1

D. Zapevalov, A.R. Sazonov, E. V. Sheverdenkin, A. Latyshev, N.I. Savostina, Z.P. Semikolenova

{"title":"Influence of cathodic polarization on the properties of epoxy powder coatings","authors":"D. Zapevalov, A.R. Sazonov, E. V. Sheverdenkin, A. Latyshev, N.I. Savostina, Z.P. Semikolenova","doi":"10.31615/j.corros.prot.2019.94.4-1","DOIUrl":"https://doi.org/10.31615/j.corros.prot.2019.94.4-1","url":null,"abstract":"The article discusses the effect of cathode polarization on the protective properties of powder epoxy coatings, assesses their operational reliability, statistics of failures and describes the problems found during their operation. In the process of applying commercially available pipes with epoxy powder coating on the existing gas pipeline, a not previously manifested defect was observed - the formation of dome-shaped swellings. This led to some restrictions on the use of epoxy powder coatings. With the advent of a new generation of epoxy materials, as well as in connection with the revision of the regulatory documentation GOST R 51164-98, the issue of removing these restrictions on their use for insulating large diameter pipes (up to 1,420 mm). Without additional protection has become topical. As a result, it became necessary to estimate the probability of the appearance of defects of this type when using modern powder coatings. We carried out laboratory studies of the effect of cathode polarization on the properties of modern two-layer epoxy coatings after exposure to them of shock loads of a certain size. The results indicate that the impact of such a mechanical load may cause the appearance of microdefects of the coating, which are not determined by the existing methods of control. Due to the penetration of electrolyte under the coating and the occurrence of certain physicochemical and electrochemical processes that are enhanced by imposing the potential of cathodic protection and increasing the operating temperature, these microdamages can serve as active centers for the formation of a cupola-shaped swelling.","PeriodicalId":20323,"journal":{"name":"Practice of Anticorrosive Protection","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87938704","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

Investigations of the corrosion activity of the KAlCl4 melts by the methods of physicochemical analysis 用理化分析的方法研究了KAlCl4熔体的腐蚀活性

Practice of Anticorrosive Protection Pub Date : 2019-12-01 DOI: 10.31615/j.corros.prot.2019.94.4-7

E. S. Filatov

{"title":"Investigations of the corrosion activity of the KAlCl4 melts by the methods of physicochemical analysis","authors":"E. S. Filatov","doi":"10.31615/j.corros.prot.2019.94.4-7","DOIUrl":"https://doi.org/10.31615/j.corros.prot.2019.94.4-7","url":null,"abstract":"Corrosion behavior of metal alloys in a melt of potassium chloroaluminate (KAlCl4) was investigated. Metal aluminum was used as a protector for protection against continuous frontal corrosion. The equilibrium potentials of aluminum and the corrosion potential of the alloys were measured. The data were obtained to evaluate the corrosion ability of the system of molten salt of potassium chloroaluminate - gas (argon) by measuring the redox potential of the specified environment depending on the composition of the gas atmosphere above it, i.e. from impurities of water vapor, hydrochloric acid, oxygen and other, for example, carbonaceous gases. The calculations of the protection efficiency using the potential difference between the metal aluminum and the protected material were performed. The regularities of changes in the equilibrium potentials of aluminum from the temperature and concentration were established as the fundamental data for possible use at determining the composition ratio of potassium chlorides and aluminum in potassium chloroaluminate as input data for the development of a sensor of composition of chloroaluminate potassium.","PeriodicalId":20323,"journal":{"name":"Practice of Anticorrosive Protection","volume":"33 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91492938","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 devices for galvanic separation on the parameters of electrochemical protection of pipelines in the conditions of screening the cathodic current 在阴极电流筛选条件下，电分离装置对管道电化学保护参数的影响

Practice of Anticorrosive Protection Pub Date : 2019-12-01 DOI: 10.31615/j.corros.prot.2019.94.4-3

E. Isupova, R. Aginey, R.N. Celishhev, D. S. Savchenko

{"title":"The influence of devices for galvanic separation on the parameters of electrochemical protection of pipelines in the conditions of screening the cathodic current","authors":"E. Isupova, R. Aginey, R.N. Celishhev, D. S. Savchenko","doi":"10.31615/j.corros.prot.2019.94.4-3","DOIUrl":"https://doi.org/10.31615/j.corros.prot.2019.94.4-3","url":null,"abstract":"The article presents the results of a laboratory study of the operation of devices for galvanic separation of cathodically protected objects and protective ground loops, consisting of semiconductor elements (diodes). During the experiment there were used simulators of protective earthing of point and long type, made of black steel, galvanized steel and copper, as well as prototypes of devices for galvanic separation of systems, made of D305 diodes. An analysis of the research results showed that connecting devices to the breaking of the protective grounding circuit allows bringing the value of the pipe-to-soil potential to the normalized level and reducing the amperage flowing onto the protective ground having an electrical connection to the cathodically-protected structure. For selection parameters of device for galvanic isolation of electrical circuits of anodic and protective groundings, there was proposeda nomogram to determine the necessary type and number of diodes in the device.It seems to be that the introduction of a developed technical device for galvanic separation of electrical circuits of anodic and protective groundings in the practice of anticorrosion protection eliminates the negative influence of protective groundings, minimizes the power consumed by stations, increases the service life of anodic groundings, and also provides the necessary reserve of cathodic protection converters for current and power.","PeriodicalId":20323,"journal":{"name":"Practice of Anticorrosive Protection","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72822190","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 study of the electrochemical properties of zinc-rich coating on the base of water sodium silicate 水玻璃基富锌涂层的电化学性能研究

Practice of Anticorrosive Protection Pub Date : 2019-12-01 DOI: 10.31615/j.corros.prot.2019.94.4-6

Le Hong Quan, N. V. Chi, Mai Van Minh, Nong Quoc Quang, Dong Van Kien

{"title":"The study of the electrochemical properties of zinc-rich coating on the base of water sodium silicate","authors":"Le Hong Quan, N. V. Chi, Mai Van Minh, Nong Quoc Quang, Dong Van Kien","doi":"10.31615/j.corros.prot.2019.94.4-6","DOIUrl":"https://doi.org/10.31615/j.corros.prot.2019.94.4-6","url":null,"abstract":"The study examines the electrochemical properties of a coating based on water sodium silicate and pure zinc dust (ZSC, working title - TTL-VN) using the Electrochemical Impedance Spectra (EIS) with AutoLAB PGSTAT204N. The system consists of three electrodes: Ag/AgCl (SCE) reference electrode in 3 M solution of KCl, auxiliary electrode Pt (8x8 mm) and working electrodes (carbon steel with surface treatment up to Sa 2.5) for determination of corrosion potential (Ecorr) and calculation of equivalent electric circuits used for explanation of impedance measurement results. It was shown that electrochemical method is effective for study of corrosion characteristics of ZSC on steel. We proposed an interpretation of the deterioration over time of the ability of zinc particles in paint to provide cathodic protection for carbon steel. The results show that the value of Ecorr is between -0,9 and -1,1 V / SCE for ten days of diving. This means that there is an electrical contact between the zinc particles, which provides good cathodic protection for the steel substrate and most of the zinc particles were involved in the osmosis process. The good characteristics of the TTL-VN coating during immersion in a 3,5% NaCl solution can also be explained by the preservation of corrosive zinc products in the coating, which allows the creation of random barrier properties.","PeriodicalId":20323,"journal":{"name":"Practice of Anticorrosive Protection","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79902061","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

Extended elastomeric anodic grounding conductors. Modern reality (part 2) 扩展弹性阳极接地导体。现代现实(第二部分)

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-1

V. E. Kopytin

引用次数: 0

Organic inhibitors of steel hydrogenation (analytical review of publications) 钢氢化的有机抑制剂(出版物分析评论)

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-8

S. A. Teryusheva

引用次数: 0

The effect of indole on kinetics of electrodeposition and morphology of cadmium and nikel coatings 吲哚对镉镍镀层电沉积动力学及形貌的影响

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-6

O. A. D. Delgado, L. M. Skibina

引用次数: 0

Descaling of heat-resistant nickel alloy VZh176 耐热镍合金VZh176的除鳞

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-3

S. Vinogradov, Y. Nikitin, M. V. Akhmedzyanov

引用次数: 0

New technologies and equipment for waste processing of galvanizing steel by immersion in a melt 熔体浸没镀锌废钢处理新技术与设备

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-4

V. Gel

引用次数: 0

Investigation of cathode material based on the LixLayMn1-yO2 system proposed as an electrode of lithium ion battery 基于LixLayMn1-yO2体系的锂离子电池正极材料的研究

Practice of Anticorrosive Protection Pub Date : 2019-09-20 DOI: 10.31615/j.corros.prot.2019.93.3-7

E. Guseva, S. S. Popova

引用次数: 0