scholarly journals Corrosion Behavior of 3% Cr Casing Steel in CO2-Containing Environment: A Case Study

2018 ◽  
Vol 11 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Lin Xu ◽  
Jie Xu ◽  
Ming-biao Xu ◽  
Si-yang Li ◽  
Shuai Liu ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Exposure Time ◽  
Corrosion Products ◽  
Localized Corrosion ◽  
Internal Corrosion ◽  
Tafel Polarization ◽  
Water Cut ◽  
Increasing Temperature

Introduction: The production casing of 3% Cr steel has encountered severe internal corrosion in Huizhou Oilfield. To disclose corrosion behavior of inner casing, a series of corrosion exposure tests were systematically conducted on 3% Cr coupons in terms of in-field conditions. Material and Methods: Influence of exposure time, temperature, and water-cut on the CO2 corrosion of 3% Cr steel was investigated, and analyses on weight loss, composition and morphology of corrosion product, and Tafel polarization curves were further carried out. Result: The results showed that the corrosion rate of 3% Cr steel increased with increasing temperature, but such trend descended when the temperature exceeded 65°C due to formation of an compact and adherent corrosion product film on the surface of 3% Cr coupons. While varying exposure time from 7 days to 14 days, the corrosion rate decreased, and the Cr and O enrichment was determined in the corrosion products. The corrosion rate of 3% Cr steel increased with a continuous increment of water-cuts, especially when the water-cut was larger than 40%. Conclusion: The localized corrosion can happen at the lower water-cut due to the presence of amorphous films. The main corrosion products were FeCO3, Cr5O12, Fe2O3, and Fe-Cr. Entry of CO2 to the simulated formation water caused an increase in the anodic Tafel slope, and accelerated dissolution of 3% Cr steel.

The Corrosion Behavior of Galvanized Steel in Alkaline Soil

2013 ◽  
Vol 331 ◽  
pp. 416-420 ◽  
Author(s):  
Feng Jie Yan ◽  
Xing Geng Li ◽  
Xue Gang Wang
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Corrosion Products ◽  
Galvanized Steel ◽  
Localized Corrosion ◽  
Alkaline Soil ◽  
Electrochemical Test ◽  
Accelerated Corrosion ◽  
Grounding Grid ◽  
Accelerated Corrosion Test

The grounding grid of some substation shows severely corrosion, which affects the safe running of power grid. Galvanized steel is widely used in grounding grid. However, the galvanized steel is easy to corrosion in alkaline soil. In this paper, the corrosion behavior of galvanized steel was studied through accelerated corrosion test of burying specimens in laboratory soils and the corrosion rate was measured by electrochemical test. The corrosion products and corrosion appearance were analyzed by means of SEM, and XRD. The results show that pitting corrosion and localized corrosion were observed on the surface of the galvanized steel, the corrosion products were rough and loose, indicating no protection, the corrosion products of galvanized steel were ZnO,FeO(OH),FeCl3,Zn3O(SO4)2,and ZnSO3·2.50H2O. Electrochemical test show that the corrosion rate of galvanized steel in the later corrosion stage is higher than in the initial corrosion stage.

Alloy Design of New Ni-Based Structural Materials for Electrolytic Reduction and its Corrosion Behavior in Lithium Molten Salt

2014 ◽  
Vol 886 ◽  
pp. 41-44 ◽  
Author(s):  
Sang Kyu Park ◽  
Tae Hyuk Lee ◽  
Moon Soo Sim ◽  
Jae Soo Noh ◽  
Soo Haeng Cho ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Molten Salt ◽  
Corrosion Behavior ◽  
Structural Materials ◽  
Solute Concentration ◽  
Inert Atmosphere ◽  
Electrolytic Reduction ◽  
Corrosion Products ◽  
Alloy Formation ◽  
Lithium Molten Salt

In this study, the corrosion behavior of new Ni-based structural materials was studied for electrolytic reduction after exposure to LiCl-Li2O molten salt at 650°C for 24-216h under an oxidizing atmosphere. The new alloys with Ni, Cr, Al, Si, and Nb as the major components were melted at 1700°C under inert atmosphere. The corrosion products and fine structures of the corroded specimens were characterized by SEM, EDS, and XRD. The corrosion rate of 12wt% Cr-2wt% Si alloys and 12wt% Cr-5wt% Si alloys are below 0.3mm/year. However, the corrosion rate of 20wt% Cr-5wt% Si is 0.6mm/year. Also, the corrosion products of 12wt% Cr alloys were Cr2O3, NiCr2O4, Ni, and NiO; those of 20wt% Cr alloys were Cr2O3, LiAl2Cr3O8, and NiO. The higher corrosion rate of 20wt% Cr-5wt% Si could be the higher solute concentration which leads to an unstable alloy formation. As confirmed by the pseudo binary phase diagram of (Ni-Cr-Al-Nb)-Si, the solubility of the silicon with 20 wt% of Cr decreased to 4 wt% from 5 wt% with 12 wt% of Cr.

Long-term monitoring of zinc corrosion behavior in typical hot and dry atmosphere environment in Turpan, China

2018 ◽  
Vol 65 (5) ◽  
pp. 471-483 ◽  
Author(s):  
Chunhui Kang ◽  
Decheng Kong ◽  
JiZheng Yao ◽  
Chunyun Guo ◽  
Li Wang ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Exposure Time ◽  
Corrosion Products ◽  
Corrosion Mechanism ◽  
Corrosion Morphology ◽  
Transfer Resistance ◽  
Positive Direction ◽  
Pure Zinc ◽  
Content Type ◽  
X Ray

Purpose This paper aims to investigate the corrosion behavior of zinc in a typical hot and dry atmosphere. It proposes the dynamic corrosion for different exposure periods. Results can provide the basic data and corrosion mechanism of zinc in such environment. Design/methodology/approach In this paper, the authors investigated the corrosion behavior of pure zinc exposed in the typical hot and dry environment in Turpan for one-four years, which has never been studied. Scanning electron microscopy, laser scanning confocal microscopy, electron probe micro-analyzer (EPMA), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were conducted to measure the corrosion morphology and products of zinc. Finally, combining electrochemical impedance spectroscopy and scanning Kelvin probe techniques, the corrosion mechanism of zinc in Turpan was examined. Findings The thickness loss of the zinc followed an exponential law with respect to exposure time: D = 3.17 t0.61, and both of the rust layer resistance and the charge transfer resistance increased with exposure time. The corrosion products mainly comprised ZnO, Zn(OH)2, Zn5(CO3)2(OH)6, Zn4SO4(OH)6·5H2O and Zn12(SO4)3Cl3(OH)15·5H2O. The Kelvin potentials shifted toward the positive direction from −0.380 to −0.262 V (vs saturated calomel electrode [SCE]) when the exposure time extended from one to four years and the distribution of the corrosion products became more and more uniform. Originality/value The corrosion behavior of pure zinc in the typical hot and dry environment in Turpan has not been studied. The dynamic corrosion for different exposure periods was obtained. The corrosion products were systemically investigated via energy-dispersive X-ray spectroscopy, EPMA, XPS and XRD.

Early Corrosion Behavior of Pipeline Steel Containing 1% Cr in Sea Water Environment

2015 ◽  
Vol 1120-1121 ◽  
pp. 773-778
Author(s):  
Zhen Guang Liu ◽  
Xiu Hua Gao ◽  
Lin Xiu Du ◽  
Jian Ping Li ◽  
Ping Ju Hao
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Sea Water ◽  
Pipeline Steel ◽  
Water Environment ◽  
Corrosion Products ◽  
Immersion Experiment ◽  
Three Stages ◽  
Stage 1 ◽  
Microscopic Surface

The corrosion behavior of pipeline steel containing 1%Cr is studied by using immersion experiment. The corrosion rust is characteried with macroscopic/microscopic surface morphology, corrosion kinetics and corrosion phases. The results demonstrate that the main corrosion products are lepidocrocite and goethite, Cr-rich compound consists of the inner layer. The corrosion process could be divided into three stages. At stage 1, the corrosion rate decreases fast, and the distributed corrosion products are formed. At stage 2, the granular corrosion products appear on coupons surface gradually, and a plain corrosion rate is obtained. At stage 3, a compact and dense corrosion layer attaches to coupons surface, and corrosion rate decreases mildly.

Corrosion Behavior of 3Cr Steel in Different Water Cut

2014 ◽  
Vol 1021 ◽  
pp. 37-41
Author(s):  
Zhi Chao Qiu ◽  
Xiang Liu ◽  
Na Zhang
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
High Water ◽  
Sem Analysis ◽  
Experimental Result ◽  
Corrosion Film ◽  
High Water Cut ◽  
Water Cut

Corrosion experiments were done to test the corrosion behavior of 3Cr steel in different water cut content. The experimental result shown that with the increase of water cut, the corrosion rate was increase especially in the high water cut environment. From XRD and SEM analysis result, the corrosion composition was changed with the water cut content. The corrosion film became less protective with the increase of water cut.

Electrochemical Investigation of Under-Deposit Corrosion Behavior for Aluminum Brass in Artificial Seawater

CORROSION ◽  
10.5006/3428 ◽  
2020 ◽  
Vol 76 (11) ◽  
pp. 1050-1063
Author(s):  
Hong Ju ◽  
Weihui Xu ◽  
Jiejing Chen ◽  
Dalei Zhang ◽  
Guomin Liu ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrolytic Cell ◽  
Artificial Seawater ◽  
Localized Corrosion ◽  
Effect Of Temperature ◽  
Multielectrode Arrays ◽  
Energy Dispersive Spectrometry Analysis ◽  
Spectrometry Analysis

The under-deposit corrosion behavior and mechanism of aluminum brass (HAl77-2) were investigated in artificial seawater with a custom double electrolytic cell. The experiments included linear polarization, electrochemical impedance spectroscopy, and multielectrode arrays analysis. The electrochemical results revealed a pronounced effect of temperature on the under-deposit corrosion behavior of HAl77-2. The corrosion of HAl77-2 inside the CaCO3 scale is aggravated with increasing temperature. However, the increasing frequency of the corrosion rate of HAl77-2 gradually decreased after 333 K. Moreover, in the desalination of artificial seawater, the corrosion rate of HAl77-2 in the occulated area initially increased and subsequently decreased with increasing Cl− concentration. The scanning electron microscopy and energy dispersive spectrometry analysis showed a remarkable appearance of selective localized corrosion on the surface of HAl77-2.

Effect of Water Cut on the Localized Corrosion Behavior of P110 Tube Steel in Supercritical CO2/Oil/Water Environment

CORROSION ◽  
10.5006/1926 ◽  
2016 ◽  
Vol 72 (11) ◽  
pp. 1470-1482 ◽  
Author(s):  
Jianbo Sun ◽  
Chong Sun ◽  
Guoan Zhang ◽  
Weimin Zhao ◽  
Yong Wang
Keyword(s):  
Corrosion Behavior ◽  
Supercritical Co2 ◽  
Water Environment ◽  
Localized Corrosion ◽  
Tube Steel ◽  
Effect Of Water ◽  
Oil Water ◽  
Water Cut

scholarly journals Corrosion Failure Cause Analysis of Buried Pipelines in Oil and Gas Stations

2020 ◽  
Vol 213 ◽  
pp. 02021
Author(s):  
Bihuang Su ◽  
Yanjun Zhang ◽  
Guibai Huang ◽  
Zhitao Wang ◽  
Ran Liu
Keyword(s):  
Corrosion Product ◽  
Oil And Gas ◽  
Chemical Elements ◽  
Metallic Matrix ◽  
Corrosion Products ◽  
Localized Corrosion ◽  
Buried Pipelines ◽  
Corrosion Failure ◽  
Gas Stations ◽  
Pipeline Corrosion

Objective: To explore the failure cause of buried pipelines in an oil and gas station. Method: The chemical elements and metallographic structure of the failed pipes were analyzed to evaluate whether the pipe body meets the requirements of relevant standards; the morphology and composition of the corrosion products were analyzed to discover the cause of corrosion. Result: The metal surface was rough and full of pitting pits with severe localized corrosion, and no crack of the metallic matrix was found. The corrosion products mainly contain Fe3O4 and a small amount of FeCO3, wherein Fe3O4 is the secondary corrosion product formed in the air, and FeCO3 is the corrosion product of CO2 in an oil and gas environment. The surface of the corroded product is loose in structure and easy to peel off, leading to further corrosion of the metallic matrix. Conclusion: The pipeline corrosion failure was caused by CO2-induced corrosion failure in the medium.

scholarly journals Efektivitas Ekstrak Kulit Buah Maja Sebagai Inhibitor pada Baja Karbon Aisi 1020 dalam Medium Korosif Nacl 3% dengan Variasi Waktu Perendaman

2020 ◽  
Vol 8 (2) ◽  
pp. 159-168
Author(s):  
Ismi Nurhayati ◽  
◽  
Pulung Karo Karo ◽  
Syafriadi Syafriadi ◽  
◽  
...  
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Corrosion Product ◽  
Corrosive Medium ◽  
Immersion Time ◽  
Corrosion Products ◽  
Skin Extract ◽  
Fruit Skin ◽  
Steel Aisi

Research has been conducted on the effectiveness of maja fruit skin extract as an inhibitor of carbon steel AISI 1020 in a corrosive medium NaCl 3% with variations in immersion time. The samples carbon steel AISI 1020 were immersed in corrosive medium NaCl 3% without being given and given the inhibitor of maja skin extract with a concentration of 0.8% for 5, 15, 25, 35, and 45 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of the maja fruit skin extract inhibitor was effective in reducing the corrosion rate of the sample with the greatest efficiency at 35 days immersion, which was equal to 72.35%. The results of XRD characterization show that the phase formed is pure Fe and Fe3O4 phase which is a corrosion product is immersed without inhibitor. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion was there were cracks, holes, and lumps which indicated that the sample had been corroded. The results of EDS characterization show that in the soaked sample there were corrosion products in the form of FeO compounds whose magnitude increased every time immersion.

scholarly journals Comparison of the corrosion behavior of the TiNi alloy in the coarse-grained and ultrafine-grained state

2021 ◽  
Vol 2124 (1) ◽  
pp. 012026
Author(s):  
E M Kayumova ◽  
A A Churakova ◽  
O R Latypov
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Volume Fraction ◽  
Significant Proportion ◽  
Gravimetric Method ◽  
Corrosion Products ◽  
Coarse Grained ◽  
Tini Alloy ◽  
Ultrafine Grained ◽  
Coarse Grained State

Abstract This article studies the corrosion behavior of the TiNi alloy in the coarse-grained and ultrafine-grained states. The study of the influence of the initial microstructure on the corrosion behavior of the TiNi alloy was carried out by the gravimetric method in the NaCl and H2SO4 solution for a month. Studies was shown that as a result of the action of a corrosive medium from a sample in a coarse-grained state, it undergoes greater destruction, pitting corrosion was observed, at the same time, in an ultrafine-grained sample only traces of corrosion products are observed on the surface of the samples. Investigations with an inverted light microscope in a dark field made it possible to observe corrosion products and determine their volume fraction. Evaluation of the corrosion rate showed that in the coarse-grained state it is 126 times higher than the corrosion rate in the ultrafine-grained state. Analysis of X-ray phase analysis showed that in the coarse-grained state after corrosion tests, a significant proportion of the TiNiH1.4 phase is observed, while in the ultrafine-grained state all phases correspond only to the TiNi phases. The TiNi alloy contains an Ti2Ni phase enriched Ti both in the coarse-grained state and in the ultrafine-grained state. Moreover, in a coarse-grained state, its share is 2 times higher.

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