Corrosion最新文献_第3页

Effects of matrix and dendrite boundary composition on stress corrosion cracking performance of Alloy 52M buttering layer in simulated PWR primary water 基体和枝晶边界成分对模拟压水堆一次水中合金 52M 黄油层应力腐蚀开裂性能的影响

IF 1.6 4区材料科学

Corrosion Pub Date : 2023-11-16 DOI: 10.5006/4392

Jiarong Ma, Qi Xiong, Xinhe Xu, Tongmin Cui, Zhanpeng Lu, Tetsuo Shoji

引用次数: 0

The Role of Nickel in Low Alloy Steels exposed to H2S-containing environments. Part II: Effect of the Electrochemical Potential and Stress Level on Trench Formation 暴露于含硫化氢环境中的低合金钢中镍的作用。第二部分:电化学电位和应力水平对海沟形成的影响

4区材料科学

Corrosion Pub Date : 2023-11-07 DOI: 10.5006/4437

Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, José L. Otegui, Mariano Iannuzzi

{"title":"The Role of Nickel in Low Alloy Steels exposed to H2S-containing environments. Part II: Effect of the Electrochemical Potential and Stress Level on Trench Formation","authors":"Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, José L. Otegui, Mariano Iannuzzi","doi":"10.5006/4437","DOIUrl":"https://doi.org/10.5006/4437","url":null,"abstract":"ABSTRACT In the first part of this paper, trenches were reported for Ni-containing steels tested using the slow strain rate test method in H2S-containing environments at the open circuit potential. Trenches are deep elongated pits, and their appearance is more alike to small blunt cracks. These features can develop a sharp sulfide stress crack at their bottom under certain conditions, which are still not fully understood. In this second and final part, the effect of the electrochemical potential and the stress level in trench nucleation and growth was investigated for the same set of Ni-containing steels with up to 5 wt.% Ni. The anodic nature of the trench formation mechanism was verified, and under an anodic polarization a critical stress value for trench formation, σtrench, was estimated from slow strain rate tests and finite element modeling. Applying a cathodic potential suppressed trench formation, but not cracking, because cracks nucleated and propagated by hydrogen stress cracking (HSC). The resulting environmental and stress-level dependencies for Ni steels confirmed that trenches could be considered a form of environmental-assisted cracking. It is concluded that the main role of trenches is to provide favorable spots for hydrogen stress crack nucleation at OCP, but their presence is neither necessary nor sufficient for cracking occurrence.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"42 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135476032","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

New insights into internal oxidation of alloy 690 and model alloys in hydrogenated steam 690合金和模型合金氢化蒸汽内部氧化的新认识

4区材料科学

Corrosion Pub Date : 2023-10-30 DOI: 10.5006/4439

Ali Riahi, Hao Zhu, Ali Eskandari, Suraj Y. Persaud, Roger C. Newman

引用次数: 0

Real-time electrochemical monitoring of the progress of sulfate reducing bacterially–induced corrosion of carbon steel 硫酸盐还原碳钢细菌腐蚀过程的实时电化学监测

4区材料科学

Corrosion Pub Date : 2023-10-27 DOI: 10.5006/4415

Sai Prasanna Chinthala, Anwar Sadek, Joshua Davis, John M Senko, Chelsea N Monty

{"title":"Real-time electrochemical monitoring of the progress of sulfate reducing bacterially–induced corrosion of carbon steel","authors":"Sai Prasanna Chinthala, Anwar Sadek, Joshua Davis, John M Senko, Chelsea N Monty","doi":"10.5006/4415","DOIUrl":"https://doi.org/10.5006/4415","url":null,"abstract":"ABSTRACT Microbiologically influenced corrosion (MIC) is a widespread problem in the oil and gas industry, and sulfate reducing bacteria (SRB) cause the most aggressive kind of corrosion. A sulfate-reducing enrichmnent culture was obtained from a natural gas transmission line, and incubated in split chamber-zero resistance ammetry (SC-ZRA) incubations. Here, carbon steel electrodes were placed in a synthetic gas field brine in opposing chambers that were connected with a salt bridge. To mimic the heterogeneous metal coverage of a metal surface that causes MIC, one chamber was experimentally manipulated with addition of the SRB culture, while the other was uninoculated. Initial measurement of positive current between the electrodes in incubations with an organic electron donor (lactate) indicated a period of priming of the metal surface by planktonic SRB, before the current transitioned to negative, indicating that the cathodic corrosive reaction was occurring on the electrode exposed to SRB activities. This negative current is consistent with hypothesized mechanisms of SRB-induced corrosion, and was observed in lactate-free incubations and in uninoculated incubations amended with sulfide. These observations, combined with SRB metabolic patterns and mass loss analyses indicate the dynamic nature of SRB-mediated corrosion and illustrate the utility of real-time monitoring of MIC activities.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136318128","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

On the occurrence of filiform corrosion on organic coated carbon steel exposed to cyclic aging test 循环时效试验中有机涂层碳钢丝状腐蚀的发生

4区材料科学

Corrosion Pub Date : 2023-10-18 DOI: 10.5006/4443

Andrea Cristoforetti, Flavio Deflorian, Stefano Rossi, Michele Fedel

引用次数: 0

Surface characterization, mechanical properties and corrosion behavior of Zn-Ni alloy coated steel using electro plating-hot dip galvanizing 电镀-热浸镀锌锌镍合金涂层钢的表面表征、力学性能和腐蚀行为

4区材料科学

Corrosion Pub Date : 2023-10-12 DOI: 10.5006/4290

Zahra Raghebi, Nagi Parvini Ahmadi, Rasul Azari khosroshahi, Robabeh Jafari

引用次数: 0

The Role of Nickel in Low Alloy Steels exposed to H2S-containing environments. Part I: Trench Formation at the Open Circuit Potential 暴露于含硫化氢环境中的低合金钢中镍的作用。第一部分:开路电位下的沟槽形成

4区材料科学

Corrosion Pub Date : 2023-10-11 DOI: 10.5006/4436

Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, José L. Otegui, Mariano Iannuzzi

{"title":"The Role of Nickel in Low Alloy Steels exposed to H2S-containing environments. Part I: Trench Formation at the Open Circuit Potential","authors":"Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, José L. Otegui, Mariano Iannuzzi","doi":"10.5006/4436","DOIUrl":"https://doi.org/10.5006/4436","url":null,"abstract":"ABSTRACT The nickel content in low alloy steels (LAS) for oil and gas exploration and production is limited to a maximum of 1 wt.% according to ANSI/NACE MR 0175/ISO 15156. This restriction is imposed to avoid sulfide stress cracking (SSC) in sour (H2S-containing) environments. In this work, the effect of Ni on SSC of LAS was studied independently of other alloying elements. For this purpose, quenched and tempered steels heat treated to a yield strength of 610 MPa with a Ni content below and above the 1 wt.% threshold were evaluated at the open circuit potential (OCP) in unstressed specimens, and in slow strain rate tests (SSRT) at room temperature. Thiosulfate was used as a surrogate of H2S, according to the Tsujikawa method. It is concluded that Ni contributes to the stabilization of the sulfide films that form on the steel's surface at OCP. The rupture of this film due to tensile stress promotes the nucleation of elongated deep pits, referred to as trenches, which can act as sulfide stress crack initiators. Trenches were observed exclusively in stressed, Ni-containing specimens. Moreover, trenches' morphology, dimensions, and distribution varied with the Ni content in the steels. For the steels studied in this work, the Ni effect on trenching persisted below the 1 wt.% threshold.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136062482","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

Galvanic Interactions on a Coupled Micro-Electrode Array of AA7050-T7451 and 316SS in Chromate-Containing NaCl Solutions Under Thick Electrolyte Film and Cyclic Wet-Dry Conditions 厚电解质膜和循环干湿条件下AA7050-T7451和316SS耦合微电极阵列在含铬NaCl溶液中的电相互作用

4区材料科学

Corrosion Pub Date : 2023-10-05 DOI: 10.5006/4334

Utibe-Eno Charles-Granville, John R. Scully, Robert G. Kelly

{"title":"Galvanic Interactions on a Coupled Micro-Electrode Array of AA7050-T7451 and 316SS in Chromate-Containing NaCl Solutions Under Thick Electrolyte Film and Cyclic Wet-Dry Conditions","authors":"Utibe-Eno Charles-Granville, John R. Scully, Robert G. Kelly","doi":"10.5006/4334","DOIUrl":"https://doi.org/10.5006/4334","url":null,"abstract":"Abstract The electrochemical behavior of an AA7050-316SS galvanic couple in chromate-containing NaCl environments under relatively constant thick electrolyte films and wet-dry cycling was investigated utilizing the coupled micro-electrode array (CMEA) approach. The CMEA approach provided a means to analyze the in-situ electrochemical kinetics as a function of spatial location and time. In inhibitor-free environments, the total net anodic charge associated with galvanic current increased with increasing conductivity and aggressiveness of the environment. The AA7050 electrodes supplied more than half of the total net cathodic charge in relation to the 316SS electrodes in the more aggressive environments. Under thick electrolyte films, chromate became less effective at suppressing cathodic kinetics on the 316SS and AA7050 net cathodes as the chloride concentration increased. Under wet-dry cycling conditions, the effectiveness of chromate was diminished when compared to thick electrolyte film conditions, due to the cycling of the equilibrium chloride concentration as electrolyte thickness changed upon onset of drying and wetting while the loading density of the salt remained constant. Furthermore, chromate exhibited a diminished ability to suppress cathodic currents on the AA7050 net cathodes in comparison to the 316SS electrodes. This study highlighted the importance of Cu-rich intermetallic particles and replated Cu on precipitation-strengthened Al alloys when considering the driving force of cathodes in sustaining anodic dissolution in typical Al alloy macro-galvanic systems exposed to atmospheric conditions.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134976118","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

Effects of Acetic Acid on the Initiation of Pitting Corrosion and Stress Corrosion Cracking on Low-alloy Steel in pH Buffer Solutions 醋酸对pH缓冲溶液中低合金钢点蚀和应力腐蚀开裂的影响

4区材料科学

Corrosion Pub Date : 2023-10-04 DOI: 10.5006/4427

Noriyuki Ida, Junichi Tani, Hirotaka Kawamura

{"title":"Effects of Acetic Acid on the Initiation of Pitting Corrosion and Stress Corrosion Cracking on Low-alloy Steel in pH Buffer Solutions","authors":"Noriyuki Ida, Junichi Tani, Hirotaka Kawamura","doi":"10.5006/4427","DOIUrl":"https://doi.org/10.5006/4427","url":null,"abstract":"ABSTRACT Applying organic chemicals as an oxygen scavenger or a corrosion inhibitor to the water treatment of steam-water circuits of power plants possibly results in the generation of organic acids, such as acetic acid. This necessitates assessing the effects of the generated organic acids on the corrosion of the steam-water circuits prior to applying the organic chemicals. In this research, the effects of acetic acid on pitting corrosion and stress corrosion cracking (SCC) on low-pressure turbine materials of low-alloy steel were examined by electrochemical measurements and U-bend tests. Buffer solutions of various pHs from 4.5 to 10 were used as test solutions to investigate the effects of acidification by acetic acid on corrosion. Electrochemical measurements indicated that the steel was passivated at pHs above 8 and was the most susceptible to pitting corrosion at pH 8. In the U-bend test, SCC was initiated readily at a pH of around 8. Because SCC occurred at sites of pitting corrosion, pitting corrosion was suggested to be a precursor of SCC. Acetate ions did not trigger pitting corrosion nor SCC on the steel. Rather, the addition of acetate ions to a Cl−-containing solution mitigated the initiation of pitting corrosion, resulting in the inhibition of SCC initiation.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135591734","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

Electrochemical behavior of an alpha-phase titanium alloy in oxidizing nitric acid environments: Influence of an oxygen-enriched layer α相钛合金在氧化硝酸环境中的电化学行为:富氧层的影响

4区材料科学

Corrosion Pub Date : 2023-10-04 DOI: 10.5006/4412

Prafful Kumar Sinha

引用次数: 0