ISSN 1002-6495
CN 21-1264/TQ
Started in 1989

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Corrosion Behavior of Nickel-based Alloy 718 in Simulated H2S/CO2 Environments
In this paper, corrosion behavior of nickel-based alloy 718 in a H2S/CO2 containing solution, which simulated the harsh formation water of an oil field, was studied by means of mass loss method and electrochemical measurement techniques. The results show that in the simulated high temperature and hi. . .
Corrosion Science and Protetion Technology, 2019 Vol. 31 (3): 291-296    DOI: 10.11903/1002.6495.2018.219
 
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Preparation and Corrosion Resistance of Glass Flake/Epoxy Composite Coatings in Marine Atmosphere PDF (521KB)
Chen-Xi YAN
2019-06-27
Erosion ripple formation mechanism and research progress PDF (924KB)
2019-06-27
The Characteristics of The High Temperature Steam Oxide Scale of T91 Martensite Steel and TP347H Austenite Steel PDF (796KB)
2019-06-27
Failure Analysis of 15Mo3 Cryogenic Superheater Tube Explosion in a Power Plant Boiler PDF (2434KB)
2019-06-27
Corrosion Potential and its chang rules of Metals in Natural Seawater PDF (1344KB)
2019-06-27
Current Issue More>>
      15 May 2019, Volume 31 Issue 3 Previous Issue   
    Inhibition Action of Dodecyl Dimethyl Betaine on Cold Rolled Steel in H2SO4 Solution
    Xin XU,Shuduan DENG,Xianghong LI
    Corrosion Science and Protetion Technology. 2019, 31 (3): 251-256.   DOI: 10.11903/1002.6495.2018.131
    Abstract   HTML   PDF (3483KB)

    The inhibition action of dodecyl dimethyl betaine (BS-18) on cold rolled steel (CRS) in 0.5 mol/L H2SO4 solution was assessed by means of weight-loss measurement, potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) and atomic force microscope (AFM). Results indicate that BS-18 exhibits excellent inhibitive ability on CRS in 0.5 mol/L H2SO4 solution. The adsorption of BS-18 on CRS surface follows Langmuir isotherm. Its inhibition efficiency increases with the increase of temperature, and it can reach as high as 96.9% at 50 ℃ with 100 mg/L BS-18. With the addition of BS-18, both cathodic and anodic corrosion reactions are inhibited simultaneously, and the charge transfer resistance is drastically increased, which leads to that the corrosion degree of the cold rolled steel surface is significantly decreased.

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    Microstructure and Property of Ni-Sn-P Composite Coatings on Carbon Steel Q235
    Chenyu ZHU,Xiaojing XU,Hao WANG,Jing HUANG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 257-262.   DOI: 10.11903/1002.6495.2018.134
    Abstract   HTML   PDF (5078KB)

    The effect of heat treatment on the microstructure and anti-fouling property of electroless plated Ni-Sn-P composite coatings with varying Sn-content on carbon steel Q235 were studied by means of XRD, hardness tester, contact angle measurement, surface free energy calculation and anti-fouling property test. Results show that the Ni-Sn-P composite coatings transform from amorphous to crystalline after heat treatment. The microhardness of the Ni-Sn-P composite coatings heat-treated at 300 ℃ reaches 1072.4 HV, which is significantly higher than that of the Ni-P coating. For the plating bath with 2 g/L Sn, the acquired coating has the best anti-fouling property with a contact angle of 120.2° and a low surface energy of 15 mJ/m2. Compared with the matrix and Ni-P coating, the fouling adherence rate on the Ni-Sn-P composite coating was significantly reduced and the anti-fouling property was improved by 55% and 46%, respectively. The addition of Sn particle could enhance the hardness and hydrophobicity of the coatings, but with the increasing Sn addition in the plating bath, the anti-fouling property of the prepared composite coatings gradually declines.

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    Case Study of DC Transit Stray Current Interference with Buried Metallic Pipeline: Field Test, Risk Evaluation and Mitigation
    Xin HE,Yuan LI,Zhengxiong LIU,Jiahui LUO,Wei SONG,Peng HE,Dezhi TANG,Caigang GE
    Corrosion Science and Protetion Technology. 2019, 31 (3): 263-271.   DOI: 10.11903/1002.6495.2018.128
    Abstract   HTML   PDF (4505KB)

    In this case, a gas pipeline was buried close to several metro or light rail transit systems in Chongqing, China. As a result, the cathodic protection system of the pipeline ran out of work. Cathodic protection parameters, as well as the corrosion potential of the stray current disturbed pipeline were measured in order to get the true evidence of stray current interference. Results showed that the present cathodic protection system was not satisfied to protect pipeline from DC transit stray current interference. Effect of DC transit stray current on corrosion potential along the stray current disturbed pipeline was analyzed. Based on the results, feeding trials test was conducted for a system under impressed current cathodic protection. It follows that the DC transit stray current interference could be controlled by the combined utilization of impressed current cathodic protection and sacrificial anode in the case that the auxiliary anode bed was designed and constructed reasonably.

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    Corrosion Behavior of X80 Pipeline Steel in High-salinity Oilfield Fluids
    Xiaoyong ZHANG,Meng ZHANG,Jizhe WANG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 272-278.   DOI: 10.11903/1002.6495.2018.133
    Abstract   HTML   PDF (14329KB)

    The corrosion tests of X80 steel were carried out in mixtures of oil and oil-field produced water via a high-temperature and high-pressure autoclave, while the effect of water content and CO2 partial pressure on the corrosion rate of X80 steel was studied by mass loss method. The steel after corrosion test was characterized by means of scanning electron microscopy (SEM), Energy Dispersive Spectrometer (EDS) and X-ray diffractormeter (XRD). The results indicated that the corrosion rate of X80 steel increased with the increasing water content. The corrosion rate of X80 steel increased with increasing CO2 partial pressure. Among others, the formed corrosion scale was the most compact when the CO2 partial pressure reached 1.5 MPa. The corrosion products were mainly composed of FeCO3. The total pressure had little effect on the corrosion of X80 steel when CO2 partial pressure was kept the same.

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    Corrosion Behavior of Cu Bearing Low Alloy Wear-resistant Steel in Salt Spray Environment
    Aiqin ZHENG,Xinli SONG,Yu CAO,Yuxi MA,Xinjun SUN,Xiaokai LIANG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 279-284.   DOI: 10.11903/1002.6495.2018.176
    Abstract   HTML   PDF (9533KB)

    The effect of Cu on the corrosion resistance of low alloy wear-resistant steel in neutral salt spray environment was studied for 120, 240, 480 and 720 h respectively in salt spray test chamber. The corrosion rate was calculated by mass loss method, and the corrosion products were characterized by XRD and SEM. The effect of Cu on the corrosion process of low alloy wear-resistant steel was assessed by potentiodynamic measurement and electrochemical impedance spectroscopy (EIS). Results show that the corrosion product of low alloy wear-resistant steel composed mainly of γ-FeOOH, α-FeOOH, Fe3O4, γ-Fe2O3. The corrosion product in the early stage is loose and porous, but became better adhesive in the late stage. The corrosion rate of Cu bearing steels increases first and then decreases, however which is significantly lower than that of Cu-free steel. With the addition of Cu, the free-corrosion potential of the Cu-bearing steel increases, correspondingly, the electrochemical impedance, the capacitive arc on impedance spectra, and the charge transfer resistance are obviously enhanced, indicating that Cu can effectively enhance the corrosion resistance of the steel.

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    Influence of Thickness of Electrodeposited Ni-CeO2 Film on Interdiffusion of δ-Ni2Al3-CeO2/Ni-CeO2 Coating System and Substrate at High Temperature
    Xiaoxiao TAN,Dan SUN,Qixiang FAN
    Corrosion Science and Protetion Technology. 2019, 31 (3): 285-290.   DOI: 10.11903/1002.6495.2018.132
    Abstract   HTML   PDF (7002KB)

    Ni-CeO2 composite films with different thicknesses were electrodeposited on Ni substrate and then aluminized at 620 ℃. Accordingly, two coating (δ-Ni2Al3-CeO2/Ni-CeO2) systems consisted of an outer portion of δ-Ni2Al3-CeO2 and an inner portion of remaining Ni-CeO2 films of ca 10 and 45 μm respectively in thickness were prepared. After vacuum annealing at 1000 ℃ for 5 h, the above two coating systems all formed a CeO2-rich layer in between the outer aluminide coating and the inner Ni-CeO2 film. However, the degradation of the coating system with the inner Ni-CeO2 film of 10 μm was more serious than that of 45 μm due to the insufficient oxides enrichment at the interface of aluminide/Ni-CeO2. It can be seen that the thickness of the remaining inner Ni-CeO2 film after aluminizing is an important factor responsible to the effectiveness of diffusion barrier for the prepared Ni-CeO2 film containing a designed amount of CeO2 particles.

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    Corrosion Behavior of Nickel-based Alloy 718 in Simulated H2S/CO2 Environments
    Guoxian ZHAO,Hengqian ZHU
    Corrosion Science and Protetion Technology. 2019, 31 (3): 291-296.   DOI: 10.11903/1002.6495.2018.219
    Abstract   HTML   PDF (3625KB)

    In this paper, corrosion behavior of nickel-based alloy 718 in a H2S/CO2 containing solution, which simulated the harsh formation water of an oil field, was studied by means of mass loss method and electrochemical measurement techniques. The results show that in the simulated high temperature and high pressure H2S/CO2 corrosive environment, the 718 alloy is slightly corroded and exhibits good resistance to uniform corrosion and local corrosion. A passivation region appears clearly on the anodic polarization curve of 718 alloy in the CO2-suturated solution, while there existed multiple activation-passivation transition phenomena on the anodic polarization curve in the H2S/CO2-saturated solution, it shows that the stability of the corrosion product film is reduced. EIS measurements indicate that the Nyquist plot of 718 alloy is composed of single capacitance loop in the solution without H2S, when H2S coexists with CO2, the plot revealed the corrosion characteristics of diffuse control at low frequencies, and the 718 alloy in the solution filled with saturated CO2 has a relatively large polarization resistance.

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    Tribological Properties of Ni-based Composite Coating with Graphene Prepared by Oxidation- and Reduction-method
    Yi WAN,Dangsheng XIONG,Jianliang LI,Wei XU
    Corrosion Science and Protetion Technology. 2019, 31 (3): 297-302.   DOI: 10.11903/1002.6495.2018.156
    Abstract   HTML   PDF (8553KB)

    Two type of graphene was prepared by Hummers oxidation and hydrazine reduction respectively and then Ni-based composite coatings containing graphene were prepared on the surface of 45 steel by pulse electrode position. The lamellar quantity and thermal stability of the prepared graphene were characterized. While the surface and cross-sectional morphology and tribological properties of the composite coatings were assessed. Results indicate that the graphene obtained by hydrazine reduction method is of about two-layers, and its thermal stability is higher than the one prepared by Hummers oxidation. The thickness of Ni-based composite plating with different additions of graphene (0.1, 0.2 and 0.4 g/L) is about 20~30 μm. The friction coefficient and wear rate of the composite coating with 0.4 g/L graphene reduce by 13% and 65% respectively in comparison to that of the substrate. The worn surface with micro-convexes like morphology is relatively smooth, which contains little Fe from the substrate, thereby implies that the depth of the wear surface is limited merely within the plating.

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    Effect of Carbon Content of Internal Wall on Corrosion Behavior of T91 Steel Tube in Simulated Seawater
    Lijun CHEN,Yue MAO,Juan ZHANG,Qinghua BAI,Xiaoyuan XIE,Fanwei ZENG,Yi TAO
    Corrosion Science and Protetion Technology. 2019, 31 (3): 303-309.   DOI: 10.11903/1002.6495.2018.190
    Abstract   HTML   PDF (7828KB)

    In recent years, it has been found that the internal wall of the as-supplied T91 steel tube had been suffered from carburization or decarburization, which resulted in varying carbon content of the relevant internal wall surfaces. In order to investigate the effect of carbon content of the internal wall on the corrosion behavior in a simulated seawater, several samples with the same dimensions but different carbon content have been sampled from different tubes, then, of which the corrosion behavior in the simulated seawater was examined via full immersion testing and electrochemical testing. Results show that corrosion of samples taken from carburized internal walls is the worst, while the corrosion resistance of samples taken from the decarburized internal walls is the best. The immersion test revealed that the corrosion rate of samples is relatively high in the initial, then decreases significantly, and finally turns to be stable. It follows that after seawater immersion test, the samples taken from the carburized internal wall form a loose porous layer with a mass loss about 12 times of that of the sample with normal carbon content, and 104 times of that of the sample taken from the decarburized internal wall. The sample taken from with the carburized internal wall tends to experience uniform corrosion form, and the sample with normal carbon content tends to experience pitting corrosion, while the surface morphology of the sample taken from the decarburized internal wall hardly changes. The results of electrochemical test are consistent with that of weight loss test.

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    Corrosion Resistance of Ammonium Metavanadate Modified Phosphate Conversion Coatings on AZ91D Mg-alloy
    Zhibin ZHOU,Yi FENG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 310-314.   DOI: 10.11903/1002.6495.2018.236
    Abstract   HTML   PDF (2897KB)

    In order to improve the corrosion performance of the ordinary phosphate conversion coatings on AZ91D Mg-alloy, different doses of NH4VO3 were added to the phosphating solution to prepare the NH4VO3 modified phosphate conversion coatings. Then the corrosion performance, surface morphology, structure and composition of the prepared coatings were assessed by means of neutral salt spray test, Tafel curve and AC impedance measurement, scanning electron microscope (SEM) with energy dispersive spectrometer. The results show that compared with the ordinary phosphate conversion coating, the phosphate conversion coating doped with certain amount of NH4VO3 presents less pores and finer cracks on the surface, which become much more obvious with the increasing amount of NH4VO3 in the phosphating solution. The NH4VO3 modified conversion coating exhibits better corrosion resistance i.e. obvious capacitive reactance characteristics, higher electrochemical impedance up to 273.6 Ω and nearly one order of magnitude lower free corrosion current density etc. in the contrast to the counterpart. Besides, the neutral salt spray resistance of AZ91D Mg-alloy with the NH4VO3 modified phosphate conversion coating could reach up to 41 h, far higher than 8 h for that with the ordinary phosphate conversion coating.

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    Corrosion Behavior of 347 Stainless Steel in Molten Nitrate Salts
    Hongchuan LI,Shengyun LI,Weiwei XUE,Xuewei ZHANG,Xuewen ZHANG,Jianqun TANG,Jianming GONG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 315-319.   DOI: 10.11903/1002.6495.2018.179
    Abstract   HTML   PDF (7289KB)

    The static corrosion behavior of 347 stainless steel (347SS) at 565 ℃ in molten nitrate salts (60%NaNO3+40%KNO3) was investigated via 2000 h immersion test. Corrosion kinetic curve of 347SS in molten salts at 565 ℃ were obtained through measuring the weight changes of the specimens at each time intervals. Moreover, XRD, SEM/EDS were used to characterize the morphology, composition and microstructure of the corrosion products on the surface and the cross section of corroded specimens, the corrosion mechanisms were also briefly described. Results showed that the corrosion behavior of 347 SS in molten nitrate salts at 565 ℃ was characterized by mass gain, its corrosion rate was very fast in the first period of 300 h, and then gradually slowed down after 300 h. As the corrosion time prolonged, the oxide scale of spinel gradually changed from needle-like and sheet-like to block-like, and it basically all tended to be block-like for corrosion up to 2000 h. After 2000 h corrosion, the outer portion of corrosion product, composed of Fe2O3 and NaFeO2, was uniform and loose with certain amount of cracks, while the inner portion of corrosion product, composed merely of (Fe,Cr)3O4, was non-uniform and dense.

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    Corrosion Failure Analysis on an Underground Pipeline for a Gas Gathering Station
    Xiu JIANG,Juzhong FAN,Dingrong QU,Quan ZHANG,Ke XU,Lianping ZHANG,Xiaoliang SONG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 320-324.   DOI: 10.11903/1002.6495.2018.143
    Abstract   HTML   PDF (15795KB)

    Corrosion failure of an underground pipeline for a gas gathering station was analyzed by means of corrosion morphology observation, corrosion product- and the material-analysis. While simulation of two-phase flow in the pipeline and corrosion tests were carried out in order to understand the corrosion mechanism of underground pipeline. Results showed that there existed a lot of sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria in the produced water; while the flow form of liquid in pipeline is laminar flow; and severe corrosion pits could be observed on 5~7o 'clock position at the bottom of the pipe, which may be caused by microbiological influenced corrosion (MIC) and under-deposit corrosion. Besides, Cl- in the produced water could also accelerate the corrosion process.

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    State of Art and Trend Prediction of Microbiologically Influenced Corrosion for Deep-sea Equipment
    Wenjing ZHAO,Jinbo JIANG,Xiangkai MENG,Jie JIN,Xudong PENG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 325-334.   DOI: 10.11903/1002.6495.2018.209
    Abstract   HTML   PDF (747KB)

    Through introducing the main mechanisms of microbiologically influenced corrosion (MIC) of deep-sea equipment, the current status of MIC of deep-sea equipment is reviewed. The major influencing factors and development directions of this field are also discussed. We found that there was little research on deep-sea MIC at present, and there existed many deficiencies and uncertainties for the existing simulation method and technology of deep-sea microbial environment. Therefore, the application oriented research on MIC for deep-sea equipment should be paid more attention. It is necessary to reveal the corrosion mechanism of materials in deep-sea extreme environments, and to build the deep-sea corrosion database of MIC, as well as to explore effective corrosion protection methods. This can provide strong support and guarantee for the design, application, anti-corrosion and performance improvement of deep-sea equipment in the future.

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    Research Progress in Formation and Formation Mechanism of CO2 Corrosion Scale on Cr Containing Low Alloy Steel
    Ming DU,Shidong ZHU,Xiaoyong ZHANG,Jinling LI,Shaohua SONG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 335-342.   DOI: 10.11903/1002.6495.2018.208
    Abstract   HTML   PDF (673KB)

    The formation and formation mechanism of CO2 corrosion scale on Cr containing low alloy steel, known as Oil Country Tubular Goods (OCTG), were summarized, while the relevant influencing factors, such as the effect of temperature, chromium content, CO2 partial pressure, pH value, Cl- concentration, corrosion time and flow velocity etc.,on the formation of CO2 corrosion scale on Cr containing low alloy steel were analyzed. In addition, the structure and composition of the corrosion scale were also summarized. Finally, the protective measures with corrosion inhibitors were classified in this paper, which would provide a reference for the research direction of the formation of CO2 corrosion scale Cr containing low alloy steel in the future.

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    Research Progress on Corrosion Performance of High Entropy Alloy Coatings
    Chuntang JIA,Minghong SHA,Shengli LI,Junwei ZHANG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 343-348.   DOI: 10.11903/1002.6495.2018.158
    Abstract   HTML   PDF (989KB)

    Corrosion resistance of high entropy alloy coatings are reviewed in this paper. The effect of preparation technique, process parameters and alloy composition on the corrosion resistance of high entropy alloys was discussed. Suggestions on the problems in the study of corrosion resistant high entropy alloy coatings and the research emphases in the future are also put forward.

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    Research Progress on Corrosion and Damage of Stainless Steel in High Temperature Molten Salts
    Xuewei ZHANG,Hongchuan LI,Shengyun LI,Weiwei XUE,Kun LIU,Jianqun TANG,Jianming GONG
    Corrosion Science and Protetion Technology. 2019, 31 (3): 349-354.   DOI: 10.11903/1002.6495.2018.137
    Abstract   HTML   PDF (609KB)

    With the increasing shortage of fossil fuels and the negative impact of carbon dioxide emissions on the global environment, the use of renewable energy sources is increasing. As one of the most cost-effective renewable electricity technologies, concentrated solar-thermal power (CSP) technology has made a significant contribution to the supply of renewable energy. Compared with other heat transfer fluids (HTFs), the corrosion and damage problems are more significant in CSP equipment using molten salts at high temperature. Among others, abundant and inexpensive replacements of HTFs are also being intensively investigated. In this paper, the application of concentrated solar-thermal power technology was summarized, especially the research status of the influence of impurity and composition of gaseous atmosphere etc. on the corrosion behavior of stainless steels in high temperature HTFs such as molten nitrates, chlorides and carbonates, and the damages induced by thermal fatigue and stress corrosion cracking were introduced. Finally, the current problems and the future development directions related with the CSP system are also discussed.

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    Interference of UHV DC Grounding Electrode with Second Pipeline of West-east Gas Pipeline
    Yu ZHU,Youjun CHEN,Kang ZHAO,Bin ZHOU,Lihang WANG,Bo ZHANG,Shiying HOU,Caigang GE
    Corrosion Science and Protetion Technology. 2019, 31 (3): 355-359.   DOI: 10.11903/1002.6495.2018.139
    Abstract   HTML   PDF (1489KB)

    Ultra-high-voltage DC (UHV DC) grounding poles can cause interference with buried metal pipelines during discharge. The interference can cause potential abnormalities so that to make the pipelines in danger. The influence of the ±800 kV UHV DC grounding pole of Jiuquan-Hunan UHV transmission line on the pipelines of the second line of the West-East Gas Pipeline was analyzed, especially for a selected pipeline section, which suffered from severe disturbances in terms of the pipeline potential, current density and corrosion rate. It reveals that during discharging of the grounding electrode, about 157 km of the selected pipeline is under-protected, while the other 108 km of the pipeline is over-protected. When the pipeline is disturbed by the grounding electrode, the current densities of the two desired monitoring points reach -37.93 and -78.60 A/m2 respectively, correspondingly, the corrosion rate of the pipe sections reached 0.496 and 0.54 mm/a, far higher than the standard allowable value of 0.01 mm/a.

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    Corrosion Problems and Countermeasures of Fluidized Catalytic Cracker Flue Gas Desulfurization and Denitration Device
    Xiwu LIU,Shouye CUI,Lanfei XU
    Corrosion Science and Protetion Technology. 2019, 31 (3): 360-364.   DOI: 10.11903/1002.6495.2018.157
    Abstract   HTML   PDF (715KB)

    Based on corrosion investigation of 11 sets of flue gas desulfurization and denitration devices of fluidized catalytic crackers (FCC) located in 6 different enterprises, the actual corrosion status of the relevant devices and pipelines was acquired, and the corrosion related hiddendangers were found. The causes of corrosion and the factors affecting corrosion were summarized, analyzed and discussed. In order to provide reference for the design of new FCC flue gas desulfurization and denitration device and the modification of existing equipments. The countermeasures for corrosion protection were put forward based on the consideration of two aspects related with material performance and process engineering. According to the investigation, serious corrosion problems only emerged at certain local areas in flue gas desulfurization and denitration devices. Which may be ascribed to the following items, namely the harsh corrosivity of environment, especially the among of corrosive substances even beyond the normal level for the processing medium, the inappropriate selection of materials especially in anti-corrosion performance and errors in equipment design etc.

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    Performance Variation of Aluminum Conductor with Carbon Fiber Composite Core after Long-term Service
    Changlong YANG,Rui LI,Ling CHEN,Peng JI,Heng MA,Yueyue LI,Cheng YE,Yujue XIA
    Corrosion Science and Protetion Technology. 2019, 31 (3): 365-370.   DOI: 10.11903/1002.6495.2018.247
    Abstract   HTML   PDF (1310KB)

    The aluminum conductor with carbon fiber composite core (ACCC) will be suffered from weathering aging in terms of deterioration in physical- and chemical-performance due to long term service in field environments, as a result of variety of factors such as illumination, temperature, humidity, chemical substances, etc. Aging of the core would finally lead to the decline of current-carrying capacity for ACCC, therefore, threatening the operation security of the transmission line. A series of tests were carried out to study and estimate the relevant properties of ACCC and the core after practical service for 7 a. The results showed that, the properties of the core declined seriously that some properties could not satisfy the requirements of the current standard. However, the carrying capacity, elasticity modulus and linear expansion coefficient of the ACCC were still superior to that of the traditional Aluminum Cable Steel Reinforced (ASCR).

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