British Corrosion Journal最新文献_第4页

Corrosion inhibition of carbon steel in hydrochloric acid by organic compounds containing heteroatoms 含杂原子的有机化合物对碳钢在盐酸中的缓蚀作用

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225002376

M. Athar, H. Ali, M. Quraishi

{"title":"Corrosion inhibition of carbon steel in hydrochloric acid by organic compounds containing heteroatoms","authors":"M. Athar, H. Ali, M. Quraishi","doi":"10.1179/000705902225002376","DOIUrl":"https://doi.org/10.1179/000705902225002376","url":null,"abstract":"Abstract Three organic inhibitors containing heteroatoms, namely: undecenoic acid hydrazide (UAH); 2-mercaptobenzothiazole (MBT); and 2-hydrazinobenzothiazole (HBT) have been synthesised in the lab and their inhibiting action on the corrosion of carbon steel in 1N HCl was investigated by means of two different techniques, namely weight loss and potentiodynamic studies. The weight loss studies were conducted in 1MHCl at different temperatures (30, 45, and 60°C) using various concentrations (25–500 ppm) of the inhibitor, and the inhibitor with the highest efficiency (HBT) was also tested for different immersion times (1/2, 3, 6, and 24 h) at the optimum concentration (500 ppm) at room temperature (30°C). The results show that the inhibitor efficiency increases with increased temperature, from room temperature (30°C) to 60°C at the most effective concentration (500 ppm). Inhibitor efficiency (IE) also increases with increase in the inhibitor concentration from 25 to 500 ppm at a given temperature and time. The effect of immersion time on the inhibition efficiency (IE) for HBT was also studied, and the results show that the inhibition efficiency (IE) increases with immersion time. The potentiodynamic polarisation studies revealed that UAH is a mixed type of inhibitor whereas MBT and H BT are predominantly anodic inhibitors. The adsorption of these inhibitors on the metal surface obeys the Temkin adsorption isotherm.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"01 1","pages":"155 - 158"},"PeriodicalIF":0.0,"publicationDate":"2002-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86501072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 47

Inhibition of corrosion of mild steel by sodium n,n-diethyl dithiocarbamate in hydrochloric acid solution n,n-二乙基二硫代氨基甲酸钠在盐酸溶液中对低碳钢的缓蚀作用

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225004383

Hongkai Fan, C. Fu, H.‐L. Wang, X. Guo, J.S. Zheng

引用次数: 49

Localised biological corrosion of X52 steel exposed within sea water pipelines 海水管道内暴露X52钢的局部生物腐蚀

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225004365

J. M. Romero, C. Angeles-Chávez, L. Martínez, M. Amaya

引用次数: 5

Role of complexes in inhibition of mild steel by zinc–1-hydroxyethylidene-1, 1-diphosphonic acid mixtures 配合物对锌-1 -羟乙基乙烯- 1,1 -二膦酸混合物对低碳钢的抑制作用

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225004347

H. Awad, S. Turgoose

{"title":"Role of complexes in inhibition of mild steel by zinc–1-hydroxyethylidene-1, 1-diphosphonic acid mixtures","authors":"H. Awad, S. Turgoose","doi":"10.1179/000705902225004347","DOIUrl":"https://doi.org/10.1179/000705902225004347","url":null,"abstract":"Abstract The action of 1-hydrox yethylidene-1, 1-diphosphonic acid (HEDP) in combination with zinc ions as a corrosion inhibitor for mild steel in oxygen containing aqueous solutions has been investigated in relation to the presence of different zinc levels, the presence of aggressive anions, and different pH values. The highest inhibition effect was obtained at a 2·7:1 zinc/HEDP molar ratio, corresponding to 60 ppm zinc, and was associated with a significant anodic effect. In the absence of chloride and with no free forms of the inhibitor components, the zinc-HEDP mixture exhibited good protection over a wide range of pH (6·5-9·5). However, in a weakly acidic medium, protection could not be achieved. Calculations based on the dissociation constants of the HEDP and the stability constants of the possible zinc-HEDP complexes showed that this inhibition can be attributed to the presence of the 2:1 zinc-HEDP complex (Zn2H-1L-) at a sufficient level. It is found that this anionic complex can behave as an anodic, passivating, inhibitor at a concentration as low as 0·00015M (20 ppm zinc-32 ppm HEDP mix ture). This passivity is prevented by the presence of sufficient chloride. The critical chloride concentration in these studies is approximately ten times higher than the complex concentration, in molar terms. It is also found that free phosphonate is aggressive and can prevent passivity due to the preferential formation of soluble iron-HEDP complex. The tolerance of the 2:1 complex to free phosphonate is substantially less than to chloride, approx imately equimolar.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"48 1","pages":"147 - 154"},"PeriodicalIF":0.0,"publicationDate":"2002-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88692176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Shape and size effects for marine immersion coupons 海洋浸渍券的形状和尺寸效应

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225004356

R. Jeffrey, R. Melchers

引用次数: 18

Impedance study of imidazoline inhibitors against hydrogen sulphide corrosion of steel 咪唑啉类缓蚀剂对钢铁硫化氢腐蚀的阻抗研究

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225004374

A. Szyprowski

引用次数: 13

Ruthenium oxide for effective activation of aluminium sacrificial anodes: a new approach 氧化钌用于铝牺牲阳极的有效活化:一种新方法

British Corrosion Journal Pub Date : 2002-07-01 DOI: 10.1179/000705902225002411

S. M. A. Shibli, Sony George, V. Gireesh

引用次数: 4

Cyclic voltammetric behaviour of copper–nickel alloys in alkaline media 铜镍合金在碱性介质中的循环伏安行为

British Corrosion Journal Pub Date : 2002-02-01 DOI: 10.1179/000705902225002448

A. Zaky, F. Assaf

{"title":"Cyclic voltammetric behaviour of copper–nickel alloys in alkaline media","authors":"A. Zaky, F. Assaf","doi":"10.1179/000705902225002448","DOIUrl":"https://doi.org/10.1179/000705902225002448","url":null,"abstract":"Abstract The electrochemical behaviour of two copper nickel alloys; cu-20 wt-%Ni and Cu-80 wt-%Ni, was studied in alkaline solution using the cyclic voltammetric technique. The voltammograms of the alloys were compared with those of the pure copper and pure nickel recorded under the same conditions. The influence of different variables such as switching potential Es, scan rate, NaOH concentration, solution temperature, and repetitive cycling was also studied. The forward sweep was characterised by the appearance of five anodic peaks: A1, A2, A3, A4, and A5, which are related to the formation of Ni(OH)2, Cu2O, Cu(OH)2, CuO, and Ni2O3, respectively. The activity of copper dissolution and, hence, the heights of the corresponding anodic peaks decreased as the nickel content in the alloy increased. X-ray diffraction analysis of the surface of the 80% nickel alloy after polarisation in the anodic direction confirmed the existence of only nickel corrosion compounds. Increasing the nickel content in the alloy retards the dissolution of copper via the formation of a very protective nickel hydroxide passive film. The addition of chloride ions, owing to their ease of adsorption, increases dissolution from the alloy. When the ratio of [Cl-]/[OH-] ex ceeds 1·5, the chloride ions initiate pitting attack. To examine the alloy surface for pit formation SEM was used.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"12 1","pages":"48 - 55"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82896829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Electrochemical impedance measurements on Ni–P coated magnesium alloy, chromated magnesium alloy, and anodised aluminium alloys in aqueous salt solutions Ni-P涂层镁合金、铬化镁合金和阳极氧化铝合金在水溶液中的电化学阻抗测量

British Corrosion Journal Pub Date : 2002-02-01 DOI: 10.1179/000705902225002330

R. George, S. Venkatachalam, K. Ninan

引用次数: 11

Eurocorr 2001 2001年Eurocorr

British Corrosion Journal Pub Date : 2002-02-01 DOI: 10.1179/bcj.2002.37.1.8

引用次数: 0