Corrosion最新文献_第4页

The Impact of Trisodium Phosphate on Chloride-Driven Under Deposit Corrosion in Steam Generators 磷酸三钠对蒸汽发生器氯化物驱动下沉积腐蚀的影响

4区材料科学

Corrosion Pub Date : 2023-09-28 DOI: 10.5006/4421

M. Sliem, N. Laycock, A. Hefny, P. Shenai, A. M. Abdullah, S. Pedrazzini, M.P. Ryan

{"title":"The Impact of Trisodium Phosphate on Chloride-Driven Under Deposit Corrosion in Steam Generators","authors":"M. Sliem, N. Laycock, A. Hefny, P. Shenai, A. M. Abdullah, S. Pedrazzini, M.P. Ryan","doi":"10.5006/4421","DOIUrl":"https://doi.org/10.5006/4421","url":null,"abstract":"Carbon or low alloy steel tubes in steam generators (or boilers) are potentially vulnerable to Under Deposit Corrosion (UDC), arising from the formation of porous magnetite deposits on the waterside heat transfer surfaces. Beneath these deposits, ‘wick-boiling’ causes concentration of contaminants (such as chlorides), which eventually leads to rapid corrosion. In this work, the corrosion of carbon steel has been investigated in hot acid chloride solutions that simulate the concentrated local environments formed during UDC. Tri-Sodium Phosphate (TSP) is sometimes dosed into boilers for pH control. This work has shown that TSP addition such that the phosphate concentration equals the chloride concentration dramatically reduces the corrosion rate in these simulated environments from &gt; 20 to &lt; 0.1 mm/yr. Additionally, a model of wick-boiling beneath deposits has been used to analyze the concentration of chlorides and phosphates during the initiation stages of UDC, suggesting that dosing of only 100 ppb of TSP into bulk boiler water should be sufficient to increase the critical deposit thickness (required for UDC) by &gt; 100 μm across a wide range of operational scenarios.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135385955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on accelerated corrosion behavior and mechanism of X80 pipeline steel welded joint under cyclic salt spray test 循环盐雾试验下X80管线钢焊接接头加速腐蚀行为及机理研究

4区材料科学

Corrosion Pub Date : 2023-09-26 DOI: 10.5006/4368

Hongchao Ji, Mengmeng Li, Naizheng Kang, Xiuli Wang, Yuanming Huo

{"title":"Study on accelerated corrosion behavior and mechanism of X80 pipeline steel welded joint under cyclic salt spray test","authors":"Hongchao Ji, Mengmeng Li, Naizheng Kang, Xiuli Wang, Yuanming Huo","doi":"10.5006/4368","DOIUrl":"https://doi.org/10.5006/4368","url":null,"abstract":"The corrosion behavior of X80 pipeline steel double-sided submerged arc welded joints in marine atmospheric environment was simulated by cyclic salt spray accelerated corrosion test. The corrosion behavior and mechanism of X80 pipeline steel welded joints were studied by means of SEM, XRD and electrochemical test, and the current effect of welded joints was evaluated by means of macroscopic and microscopic morphology, corrosion weight loss, corrosion product composition, polarization curve and impedance spectrum of samples with different cycles. The results show that with the extension of corrosion time, the corrosion morphology of each region of the welded joint changes from the initial uniform corrosion to a large difference. During the whole process, the surface fluctuation of the base-metal area is small, and no obvious pitting pits are observed. Cracks are gradually generated in the heat affected zone and the weld metal, and as the cracks expand, the surface pits deepen. The corrosion rate of the three regions of the welded joint showed a trend of rapid increase-slow decrease-slow increase-slow decrease. It provides conditions for further research on the simulation and correlation of accelerated corrosion test.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135718858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxidation of NiCr and NiCrMo alloys at low temperatures NiCr和NiCrMo合金的低温氧化

4区材料科学

Corrosion Pub Date : 2023-09-22 DOI: 10.5006/4400

Cameron Volders, Gopalakrishnan Ramalingam, Valentina Angelici Avincola, Iradwikanari Waluyo, Adrian Hunt, Petra Reinke

引用次数: 0

Residual bond strength of highly corroded Reinforced Concrete 高腐蚀钢筋混凝土的剩余粘结强度

4区材料科学

Corrosion Pub Date : 2023-09-22 DOI: 10.5006/4333

Ankit Kumar Jaiswal, S.S. Gadve

{"title":"Residual bond strength of highly corroded Reinforced Concrete","authors":"Ankit Kumar Jaiswal, S.S. Gadve","doi":"10.5006/4333","DOIUrl":"https://doi.org/10.5006/4333","url":null,"abstract":"Corrosion of reinforcement due to chloride attacks in the marine environment is a natural phenomenon. Corrosion of reinforcement produces corrosion products of high volume, which deteriorates the structural integrity of reinforced concrete structure due to loss of bond, cracking and, spalling of the concrete. Existing literatures have documented tests investigating the bond behavior of uncorroded and corroded specimens, but there is a dearth of data pertaining to a more advanced stage (higher mass loss) of corrosion. In the current study, an accelerated corrosion test was conducted on cylindrical (lollipop) specimens, which involved utilizing an impressed current laboratory technique to induce three distinct levels of corrosion (10%, 20%, and 40% mass loss). Moreover, to assess bond strength, the pull-out tests were performed on both corroded and uncorroded specimens. The present study deals with the residual bond strength at three different corrosion levels, as a function of different parameters such as clear cover (CC), water-cement (w/c) ratio, and two different reinforcement diameters. Experimental data reveals that mass loss achieved is lesser than the target mass loss for all specimens. It is observed that at higher corrosion levels, where the mass loss exceeds 10% or cracks appear on the surface of the reinforced structure, both an increase in mass loss and a decrease in residual bond strength are consistently observed. These effects remain consistent regardless of whether the parameters such as bar diameter, w/c ratio, and clear cover are increased or decreased. The statistical analysis was performed on the experimental data to develop predictive models for estimating the residual bond strength and mass loss. For higher mass loss of 30-35%, the corresponding bond strength for all the specimens falls within the range of 4-6 MPa.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136058843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of chloride concentration on the environment-assisted cracking behavior of an Al-Mg alloy in atmospheric environments 氯化物浓度对大气环境中Al-Mg合金环境辅助开裂行为的影响

4区材料科学

Corrosion Pub Date : 2023-09-20 DOI: 10.5006/4279

Patrick J. Steiner, Zachary D. Harris, James T. Burns

{"title":"Effect of chloride concentration on the environment-assisted cracking behavior of an Al-Mg alloy in atmospheric environments","authors":"Patrick J. Steiner, Zachary D. Harris, James T. Burns","doi":"10.5006/4279","DOIUrl":"https://doi.org/10.5006/4279","url":null,"abstract":"The effect of chloride concentration on the environment-assisted cracking (EAC) behavior of AA5083-H131 in atmospheric environments was investigated using high-fidelity fracture mechanics-based testing and concurrent electrochemical potential measurements. EAC susceptibility was found to increase across all environments as chloride concentration increased, denoted by a decrease in the threshold stress intensity and faster stage II crack growth rates. However, EAC susceptibility for a given chloride concentration decreased across all chloride concentrations as cathodic limitation due to solution geometry effects increased. These results are analyzed in the context of the proposed anodic dissolution-enabled hydrogen embrittlement mechanism for EAC in Al-Mg alloys. Specifically, the increase in EAC susceptibility noted at higher chloride concentrations is postulated to arise from an increased overpotential for hydrogen production at the crack tip. Conversely, the decrease in EAC susceptibility observed as the solution geometry becomes more restrictive is attributed to cathodic limitation at the bulk surface decreasing dissolution at the crack tip, resulting in a concomitant less aggressive crack chemistry, and thus lower levels of hydrogen production and uptake at the crack tip. A close correlation between the open-circuit potential on the bulk specimen surface and the crack growth kinetics was also observed across all environments and chloride concentrations, with higher chloride concentrations and cathodic limitations resulting in larger changes in electrochemical potential. This correlates well with known electrochemical potential-dependent EAC observations for these alloys.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136313962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Anodic Polarization on the Susceptibility of AA6111 Automotive Sheet to Stress Corrosion Cracking 阳极极化对AA6111汽车板材应力腐蚀开裂敏感性的影响

4区材料科学

Corrosion Pub Date : 2023-09-20 DOI: 10.5006/4314

K.E. Catledge, G.C. Montiel, M. Nichols, Jenifer S. Locke

{"title":"Effect of Anodic Polarization on the Susceptibility of AA6111 Automotive Sheet to Stress Corrosion Cracking","authors":"K.E. Catledge, G.C. Montiel, M. Nichols, Jenifer S. Locke","doi":"10.5006/4314","DOIUrl":"https://doi.org/10.5006/4314","url":null,"abstract":"AA6xxx Al-Mg-Si-Cu alloys are increasingly used to meet lightweight objectives in automotive applications given their high strength-to-weight ratio. However, their use in conjunction with steels and carbon fiber-reinforced polymers in these applications will result in galvanic coupling that may be deleterious to the Al alloy. As such, the ability of anodic polarization to induce stress corrosion cracking (SCC) in AA6xxx, an alloy typically considered SCC-resistant, is explored. In this study, fracture mechanics-based testing under full immersion in 0.6 M NaCl was used to quantify the threshold stress intensity above which SCC can occur (KTH) and stage II SCC crack growth rate (da/dtII) as a function of applied potential at and above the freely corroding potential. Under freely corroding conditions and potentials applied within the range observed for the freely corroding potential, no SCC was observed as results matched those gathered in the air (i.e., KTH was equivalent to the measured fracture toughness). When applying potentials anodic to the freely corroding potential (greater than −706 mVSCE), a decrease in KTH and an increase in da/dtII was observed. Crack growth rates measured under anodic polarizations were slowed through the reapplication of the freely corroding potential. These data imply that galvanic coupling may have the capacity to induce severe SCC in AA6111.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136313947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Anions on the Corrosion Behavior of 9Cr-1Mo Ferritic Steel in Aqueous Media 阴离子对9Cr-1Mo铁素体钢在水介质中腐蚀行为的影响

4区材料科学

Corrosion Pub Date : 2023-09-20 DOI: 10.5006/4384

C. Thinaharan, S.C. Vanithakumari, A. Ravi Shankar, John Philip

{"title":"Influence of Anions on the Corrosion Behavior of 9Cr-1Mo Ferritic Steel in Aqueous Media","authors":"C. Thinaharan, S.C. Vanithakumari, A. Ravi Shankar, John Philip","doi":"10.5006/4384","DOIUrl":"https://doi.org/10.5006/4384","url":null,"abstract":"Modified 9Cr-1Mo steel is used as steam generator material in prototype fast breeder reactors, owing to its good corrosion resistance, creep, and thermal conductivity characteristics. In the present study, the corrosion behavior of modified 9Cr-1Mo steel in aqueous environments containing various corrosive ions at potentiodynamic polarization conditions is reported. In chloride-exposed samples, randomly distributed dense shallow pits were seen, whereas mixed anions (, Cl−, and ) in fresh water resulted in deeper pits uniformly distributed on the entire surface. Laser Raman spectroscopy studies revealed the formation of Fe-oxides/hydroxides and Cr(VI) species, except in alkaline solution. A very thin film of only Fe-oxides (Fe3O4, γ-Fe2O3, and α-Fe2O3) was identified in an OH– ion-dominated solution. X-ray photoelectron spectroscopy results confirm the corroded surfaces comprised of Fe, Cr, and Mo-oxides of varying composition and enrichment of Mo-oxides in alkaline solution. Chloride ions present in the corroded layer influenced the pitting corrosion in neutral chloride and fresh water solutions. Field emission scanning electron microscopy images revealed abundant crystalline lepidocrocite with laminar morphology and doughnut-type magnetite together with pits on the samples exposed in neutral chloride and fresh water media.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136378397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular origin of the CO2 enhanced water wetting during corrosion of an oil layer-attached steel surface in water flows 在水流中，CO2分子源增强了油层附着钢表面腐蚀过程中的水润湿

4区材料科学

Corrosion Pub Date : 2023-09-18 DOI: 10.5006/4295

Jialu Ouyang, Xixi Wang, Dajiang Zheng, Jian Zhang, Zi Ming Wang

引用次数: 0

Deciphering when Metal Corrosion is Spontaneous in Molten Fluorides Using Potential-Activity Diagrams 利用电位活度图破译熔融氟化物中金属腐蚀何时自发发生

4区材料科学

Corrosion Pub Date : 2023-09-18 DOI: 10.5006/4401

Ho Lun Chan, John R. Scully

引用次数: 0

Toward High Pitting Resistance and Low-Cost Austenitic Stainless Steel: the Role of Carbon Alloying 迈向高抗点蚀和低成本奥氏体不锈钢:碳合金化的作用

4区材料科学

Corrosion Pub Date : 2023-09-18 DOI: 10.5006/4395

Kangkang Zheng, Wei Dai, Donghua Suo, Zhe Fang, Yiming Jiang, Jin Li, Zhiyu Wang, Yangting Sun

引用次数: 0