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

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Failure Analysis on Natural Gas Pipeline of 20 Steel and 16Mn Steel
The failure analysis for a natural gas pipeline, composed of pipes of 20 steel and 16Mn steel, was performed by means of examination of macro-morpholopy, metallograph, inclusion analysis as well as scanning electron microscope examination and chemical analysis for the relevant materials. Results sho. . .
Corrosion Science and Protetion Technology, 2018 Vol. 30 (2): 195-201    DOI: 10.11903/1002.6495.2017.115
 
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2018-09-18
The Influence of the Thickness of Electrodeposited Ni-CeO2 Film on the Interdiffusion of the δ-Ni2Al3-CeO2/Ni-CeO2 Coating System and the Substrate at High Temperature PDF (1149KB)
2018-09-18
Study on microstructure and properties of Ni-Sn-P composite coatings PDF (700KB)
2018-09-18
Experimental Research on Corrosion of Rock Bolts Caused by Metro Stray Current PDF (393KB)
2018-09-18
Researches on Corrosion and Damage of Stainless Steel in High Temperature Molten Salt PDF (292KB)
2018-09-18
Current Issue More>>
      20 September 2018, Volume 30 Issue 5 Previous Issue   
    Preparation and Properties of Antistatic and Anitcorrosion Coatings
    Min LIU, Shuyan ZHAO, Fuchun LIU, En-Hou HAN, Zhouhai QIAN, Liwei ZHU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 459-466.   DOI: 10.11903/1002.6495.2017.289
    Abstract   HTML   PDF (3818KB)

    By replacing partially, the quantity of zinc powder in zinc-rich coatings with conductive mica, zinc-rich coatings with different amount of conductive mica were prepared, then of which the antistatic-, mechanical- and anticorrosion-properties were assessed by means of measurements of surface- and volume-resistivity, pencil-hardness, impact resistance and adhesion etc. as well as immersion test, salt spray test and electrochemical impedance spectroscopy. Results show that the antistatic properties of the coatings are only slightly affected after the salt spray test. Among others, the coating with addition of 3% conductive mica shows the best performance in antistatic and anticorrosion, while the cathodic protection effectiveness of the coating is improved.

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    Corrosion Behavior of Q345R Steel in Simulated High Mineralization Waters
    Guoxian ZHAO, Yuanyuan WANG, Yongxin LU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 467-474.   DOI: 10.11903/1002.6495.2018.104
    Abstract   HTML   PDF (5622KB)

    Inner components made of steels was frequently suffered from corrosion failure for walnut shell filters in a domestic oilfield. Therefore, corrosion behavior of Q345R steel in artificial highly mineralized waters, which aims to simulate waters encountered in walnut shell filters, was studied by means of weight loss measurement and electrochemical testing methods. Results show that the corrosion rate of Q345R steel increases first and then decreases with the increase of temperature in the dissolved oxygen containing water with CO2 and CO2/H2S respectively. However, the corrosion rate of Q345R steel gradually increases with increasing temperature in dissolved oxygen containing water with H2S. In the dissolved oxygen containing water with CO2/H2S, Q345R steel presents relatively small electrochemical corrosion tendency, the largest electrochemical corrosion dynamics resistance and the best corrosion resistance. On the contrary, in the dissolved oxygen containing water with CO2 or H2S respectively, the Q345R steel presents more or less the same level for electrochemical corrosion tendency and electrochemical corrosion dynamics resistance, but relatively poor corrosion resistance. This implies that the corrosion resistance of the Q345R steel is sensitive to the service environment.

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    Effect of Y Addition on Corrosion Resistance of Pack Cementation Zinc Coating on 42CrMo Steel
    Li LIU, Sirong YU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 475-480.   DOI: 10.11903/1002.6495.2018.079
    Abstract   HTML   PDF (2637KB)

    To improve the corrosion resistance of 42CrMo steel, coatings of Zn-Fe and Zn-Fe-Y were prepared by pack cementation process at 410 ℃ for 3 h. The prepared coatings were then characterized in terms of microstructure, thicknesse, phase composition, chemical composition as well as corrosion rate and polarization behavior in 3.5%NaCl solution. Results show that the Zn-Fe coating and Zn-Fe-Y coating were continuous and monolayered. The Zn-Fe-Y coating was thicker than the Zn-Fe coating. The Zn-Fe coating was composed of FeZn9, FeZn11 and Fe11Zn40 phases, besides YZn5 could be detected in the coating with the addition of Y. The element concentration profiles showed that the addition of Y promoted the diffusion of Zn and Fe atoms. The corrosion rate of the Zn-Fe-Y coating was smaller than that of the Zn-Fe coating. The corrosion current density of the two coatings was lower than that of the substrate, while the corrosion current density of the Zn-Fe-Y coating was lower than that of the Zn-Fe coating. The corrosion resistance of the Zn-Fe-Y coating was better than that of the Zn-Fe coating.

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    Corrosion Behavior of High Strength Spring Steels 60Si2CrVA and SAE9254 in NaCl Solution
    Min ZHU, Lun NIE, Yongfeng YUAN, Shaoyi GUO, Simin YIN, Gaohong YU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 481-488.   DOI: 10.11903/1002.6495.2018.068
    Abstract   HTML   PDF (5187KB)

    The corrosion behavior of high strength spring steels 60Si2CrVA and SAE9254 in 5%(mass fraction) NaCl solution has been investigated by means of salt spray test, electrochemical impedance spectroscopy (EIS), polarization curve, and slow strain rate testing (SSRT). The result of salt spray test shows that the average corrosion rates of the two spring steels increase firstly and then decrease with time. The tested steels exhibit obviously pitting corrosion, and the corrosion product of the steels consists mainly of α-FeOOH, β-FeOOH, Fe2O3 and Fe3O4. In the early stage, SAE9254 steel has better corrosion resistance. However, 60Si2CrVA steel possesses better corrosion resistance in long term, which is also indicated by the results of EIS test and polarization curve. The SSRT result shows that the SCC susceptibility of 60Si2CrVA steel is lower than that of SAE9254 steel. The mixed crack propagation mode of the two steels tested by a constant potential of -1 V (vs SCE) in NaCl solution is that the shallow crack is intergranular (IGSCC), and the deep crack is transgranular (TGSCC), and the SCC mechanism may mainly accord with hydrogen embrittlement (HE).

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    Effect of Rare Earth Element Ce on Corrosion Resistance of 316L Stainless Steel
    Haiying DONG, Lijuan HU, Wanyi LIANG, Yaoping XIE, Baoquan LIN
    Corrosion Science and Protetion Technology. 2018, 30 (5): 489-495.   DOI: 10.11903/1002.6495.2017.288
    Abstract   HTML   PDF (3681KB)

    Corrosion resistance of 316L stainless steels without and with addition of rare earth element Ce in 3.5% (mass fraction) NaCl solution was studied by means of mass change measurement,polarization curve measurement, EIS and SEM etc. Results show that the moderate addition of Ce can effectively decrease the mass loss and the corrosion rate of the 316L stainless steel, while diminish the size and quantity of corrosion pits on the steel surface. Accordingly, the moderate addition of Ce can reduce the corrosion current density, while enhance the free corrosion potential and the capacitive reactance of the steel. In other word, the moderate addition of Ce can enhance the corrosion resistance of the 316L stainless steel. Among others, the 316L stainless steel with the addition of 0.015% (mass fraction) Ce exhibits the best corrosion performance. The above beneficial effect of Ce addition may be ascribed to that rare earth Ce effectively reduce the segregation of S impurity at grain boundaries, refine the morphology of inclusions and decrease the inclusion size in the modified 316L stainless steel.

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    Internal Corrosion Cause Analysis of a Products Pipeline Before Putting into Operation
    Meng LIU, Youwen JIANG, Shuo HAN, Xin LV, Aiping REN, Wenhui LIU, Bingchuan YAN, Xinhua CHEN
    Corrosion Science and Protetion Technology. 2018, 30 (5): 496-502.   DOI: 10.11903/1002.6495.2017.211
    Abstract   HTML   PDF (7902KB)

    Corrosion failure analysis of a west-located product pipeline before putting into operation was carried out in terms of analyzing the inspection corrosion data and the pipeline conditions as well as the macro-morphology observation, microstructure examination, analysis of chemical composition and constituents of corrosion products by means of SEM, EDS and XRD. The results showed that due to the large variation of the pipeline elevation and the insufficient cleaning up of the hydrotest water, thus there existed residual water at some low points of the pipeline. Where, water-line corrosion might occur as a result of oxygen concentration difference cell formed between the upper and lower parts of the water-line. In addition, water-line corrosion was accelerated due to sealed with pressurized air. Therefore, as countermeasure, it is proposed that the pipeline should be completely cleaned up and even dried up by air blowing after hydrotesting, and for the pipeline which was not immediately put into operation, a nitrogen injection sealing should be adopted to avoid such corrosion.

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    Repassivation Process on Stressed Alloy 800 in Simulated Crevice Chemistry Containing Thiosulfate
    Yu ZHU, Zeqing WANG, Yinghao SUN, Fangxu LIN, Dahai XIA, Shizhe SONG, Jianqiu WANG, Zhiming ZHANG
    Corrosion Science and Protetion Technology. 2018, 30 (5): 503-507.   DOI: 10.11903/1002.6495.2017.275
    Abstract   HTML   PDF (2750KB)

    The repassivation kinetics of stressed Alloy 800 in simulated crevice chemistries containing thiosulfate is studied by scratch test, while the stress is exerted by a C-ring sample. Results indicate that, as the potential moves to anodic directions, the maximum current and repassivation current increase, which reveals that the anodic dissolution rate increases. Compared to the unstressed sample, the maximum current and repassivation current of the stressed sample are higher, indicating an increased anodic dissolution rate and a retarded repasivation process. The retard effect of thiosulfate on the repassivation of the alloy may be ascribed to that thiosulfate is adsorbed and then electrochemically reduced to elemental sulfur on the bare metal surface, which subsequently enhance the anodic dissolution.

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    Cathodic Protection Effectiveness of Pipeline Beneath Disbonded Coating in a Dry-wet Alternating Soil Environment
    Jun ZHAO, Maocheng YAN, Changfang WU, Yun SHU, Ailing GUO
    Corrosion Science and Protetion Technology. 2018, 30 (5): 508-512.   DOI: 10.11903/1002.6495.2018.096
    Abstract   HTML   PDF (5085KB)

    Based on a field survey of disbondment failure cases of coatings of three layered polyethylene (3PE) for a long-distance pipeline, a simulating experimental apparatus was constructed to study the distribution of cathodic protection (CP) current and potential of pipeline beneath disbonded coating in the environment of alternatively wetting and drying with soil extract. The potential of pipeline and pH value of the local environment was monitored with microelectrode technology. Results show that CP is limited to the opening holiday. The cathodic protection potential gradient and CP current are mainly concentrated near the holiday, while for spots of the pipeline steel where located in the deep within crevice is in a free corrosion state. With increasing dry/wet cycles, the local potential of the area from the damage point to the depth 45 mm in the crevice gradually shifts negatively. The effective protection distance is only a few centimeters when the disbonded gap is 1 mm.

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    Stress Corrosion Cracking Behavior of Austenitic Stainless Steel in Sulfur Containing Waste Water
    Yanling ZHANG, Lei HAN, Xiaoliang SONG
    Corrosion Science and Protetion Technology. 2018, 30 (5): 513-517.   DOI: 10.11903/1002.6495.2017.225
    Abstract   HTML   PDF (2823KB)

    The stress corrosion cracking (SCC) of 321, 304 stainless steel should be paid enough attention,since large amount of stainless steel was used in sulfur containing waste waters. This article studied the stress corrosion cracking (SCC) behavior of 321 and 304 stainless steel in the sour water through the c-ring exposure experiment, stress ring exposure experiment and slow strain rate tensile test (SSRT). Results showed that the risk of SCC in sour water environment did not reach a high degree, but the surface of specimen has obvious pitting after soaking, and the degree of pitting became more and more serious with the increase of soaking time. Ravine-like corrosion with little corrosion cracks could be observed for the c- ring 321 sample with the largest load stress after 3 months of immersion, therefore, the risk of SCC can not be ruled out. The cracking sensitivity of 304 stainless steel samples in the NH4Cl solution did not increase monotonously with the increase of the concentration of chloride ion, the cracking sensitivity is highest when the concentration of Cl- is between 50 and 100 mg/L, the pH value at 25 ℃ is about 6.

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    Corrosion Behavior of Ni and Ni-Dy Alloys in Molten LiCl-5%Li2O at 937 K
    Ying LIU, Hua SUN
    Corrosion Science and Protetion Technology. 2018, 30 (5): 518-522.   DOI: 10.11903/1002.6495.2018.057
    Abstract   HTML   PDF (4504KB)

    The corrosion behavior of pure Ni and Ni-Dy alloys in molten LiCl-5% Li2O at 937 K in air was studied by immersion corrosion test. The corrosion product on the surface of Ni was mainly composed of NiO, Li2Ni8O10 and LiNiO2, while Dy2O3 was also detected on the surface of Ni-Dy alloys in addition to the above Ni-rich oxides. The corrosion rate of Ni-Dy alloy increases with the increasing Dy-content. The corrosion rates of Ni-1Dy and Ni-3Dy are lower, but of Ni-5Dy and Ni-10Dy are larger than pure Ni. It was concluded that the corrosion resistance of Ni in molten LiCl-Li2O could be improved by the addition of appropriate amount of Dy.

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    Corrosion Behavior and Protection Measures of Typical High-strength Fasteners in Hainan Rain Environment
    Shiwen ZOU, Wen XU, Songtao LU, Yujun SHAO, Yuning WANG
    Corrosion Science and Protetion Technology. 2018, 30 (5): 523-528.   DOI: 10.11903/1002.6495.2017.292
    Abstract   HTML   PDF (3352KB)

    The corrosion data of high-strength fasteners made of 30CrMnSiA, 30CrMnSiNi2A, GH4169 and Ti-6Al-4V were acquired by means of immersion (168 h) test in simulated rain-water of Hainan island and field exposure in marine atmosphere in a side within 1 km from the coastline at Hainan. The protection effectiveness of different surface treatments and coating methods on high-strength fasteners was also verified. Results show that GH4169 and Ti-6Al-4V present high corrosion resistance, and the surface treatment of flZnAl12 can meet the corrosion protection requirement for 30CrMnSiNi2A fasteners. Treatments of Fe/Ep.Zn7.c2C and flZnAl12 can enhance the corrosion resistance of 30CrMnSiNi2A fasteners to a certain extent, while pitting corrosion cannot avoid; and alkyd resin varnish coating has good protection effect.

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    Corrosion Failure Analysis of Bursting Disc for Cryogenic Liquid Tank
    Yi TANG, Shaoxing YU, Ji ZHANG, Haiyan WANG, Peng LIU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 529-533.   DOI: 10.11903/1002.6495.2017.272
    Abstract   HTML   PDF (5018KB)

    Ground equipment of Wenchang space launching site at Hainan province is apt to suffer from corrosion because of the high temperature, high humidity and high salt-containing marine atmosphere there, especially for the areas within 1 km from the coastline, even stainless steels also suffer from serious pitting corrosion. Failure analysis of a bursting disc for a cryogenic liquid tank is carried out by means of macroscopic- and microscopic-observation. Results show that due to the poor reverse sealing performance of the check valve, the Cl- containing marine atmosphere can easy reach the relevant place, causing pitting corrosion on the outer surface of the bursting disc, and ultimately causing the corrosion perforation.

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    Review on Monitoring- and Prediction-technology for Scaling Process of Gathering Pipes of Oilfields
    Jie YUAN, Limei SUN, Jing TIAN, Zehua DONG
    Corrosion Science and Protetion Technology. 2018, 30 (5): 534-542.   DOI: 10.11903/1002.6495.2017.291
    Abstract   HTML   PDF (732KB)

    In the light of different scaling characteristics of pipes for injection waters in oilfields, several prediction methods for the scaling process are summarized in this paper. Correspondingly, several monitoring methods are proposed, which include two major categories: thermal method and non-thermal method. Their advantages, criteria, applicable situations and limitations are discussed in detail. Finally, the outlook of new monitoring technology is put forward.

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    Research Progress on Flow-accelerated Corrosion of Power Plant and Contermeasures
    Tong LIN, Keyi ZHOU, Xiaodong SI
    Corrosion Science and Protetion Technology. 2018, 30 (5): 543-551.   DOI: 10.11903/1002.6495.2017.300
    Abstract   HTML   PDF (995KB)

    Flow-accelerated corrosion (FAC) has become the second largest failure mode for power plant facilities, which seriously affects the safe operation of the power unit. Therefore, the effect of environmental- and material-factors on the FAC rate is discussed in terms of the relevant FAC mechanism and the hydrodynamics in this paper. It follows that after correct diagnose for the cause of FAC, to enhance the resistance to FAC of the pipeline effectively through reasonable design, proper material selection and appropriate chemical control of water, as well as to reduce the possibility of pipe leakage caused by FAC should be beneficial to the safe- and reliable-operation of power plant, which is of great significance to refrain power plants from the harm of flow-accelerated corrosion.

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    Review on Epoxy Composite Coatings with Graphene Oxide
    Shuhua ZHAO, Congming HUANG, Shuli WANG, Hong CHEN, Xiaojun SHI, Zheng CAI
    Corrosion Science and Protetion Technology. 2018, 30 (5): 552-556.   DOI: 10.11903/1002.6495.2017.268
    Abstract   HTML   PDF (621KB)

    Graphene oxide (GO) nanosheets present excellent properties, such as a large specific surface area, a large number of epoxide functional groups on basal planes, as well as carbonyl and carboxyl groups on edges. Herein, modification methods of graphene oxide were introduced and then the research progress of epoxy composite coatings with graphene oxide was highlighted, including the synthesis and performance of epoxy composites. The relevant anticorrosion mechanism of epoxy composite coatings was summarized and finally the future research trend was also prospected.

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    Synthesis and Application of Polypyrrole in Corrosion Prevention
    Yaqian ZHOU, Lu HAO, Kaiming ZHU, Demei YU
    Corrosion Science and Protetion Technology. 2018, 30 (5): 557-562.   DOI: 10.11903/1002.6495.2017.311
    Abstract   HTML   PDF (1314KB)

    The paper mainly introduces the chemical oxidation- and electrochemical-synthesis of polypyrrole (PPy). Meanwhile, the relevant protection mechanisms of PPy coatings against metal corrosion are stated in detail such as physical barrier, corrosion inhibitor effect,anodic protection and electrochemical interface migration. Furthermore, the latest research progress of PPy composite materials in the field of corrosion prevention are reviewed. Finally, the prospect of PPy application in the field of corrosion prevention is previewed.

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