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Article
Publication date: 1 April 1972

O. Radovici, Al. Constantinescu and I. Pleseanu

Intense corrosion occurs frequently in degasolination units, leading to repeated stoppings of the degasolination process and to expensive overhauls or even to the replacement of…

15

Abstract

Intense corrosion occurs frequently in degasolination units, leading to repeated stoppings of the degasolination process and to expensive overhauls or even to the replacement of the severely damaged equipment. In order to establish the possibilities of reducing corrosion in such plants, studies were carried out on the mechanism and the role of the various factors accounting for the occurrence and intensification of this phenomenon, enabling the development of corrosion control methods.

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Anti-Corrosion Methods and Materials, vol. 19 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 January 1972

R. Chandrashekar and K.I. Vasu

Tests have been carried out to determine the stress corrosion susceptibility of Al‐4.4 a/o Xn alloy in the aged condition. Flat ribbon specimens were tested in aqueous solutions…

22

Abstract

Tests have been carried out to determine the stress corrosion susceptibility of Al‐4.4 a/o Xn alloy in the aged condition. Flat ribbon specimens were tested in aqueous solutions containing 3.5% NaCl at a constant stress of 5.76 kg/mm2 (32% of UTS). Polarisation studies carried out on the stressed and unstressed specimens reveal that the Tafel slopes have a much lower value in the stressed condition. The susceptibility to stress corrosion increases with the test temperature. An equation of the type Z=K. exp (—E/RT) with reciprocal life Z and test temperature T, is found to fit the data from which the value of the activation energy is found to be ca. 20 kcal.mol−1.

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Anti-Corrosion Methods and Materials, vol. 19 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 May 1961

Last month we published abstracts and summaries of some of the papers presented at the Congress, which was held at the Imperial College of Science and Technology from April 10–15…

46

Abstract

Last month we published abstracts and summaries of some of the papers presented at the Congress, which was held at the Imperial College of Science and Technology from April 10–15 under the auspices of the International Union of Pure and Applied Chemistry. In this issue we publish further abstracts and summaries together with illustrations of many of the corrosionists attending and photographs of some of the many visits which were arranged to works and laboratories. The Congress attracted over 800 delegates.

Details

Anti-Corrosion Methods and Materials, vol. 8 no. 5
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 April 1964

F.P.A. Robinson and M. Shalit

Under certain conditions the Cu‐Zn alloys are found to corrode by a process known as dezincification. As the term implies, zinc is removed from the alloy, leaving as a residue a…

106

Abstract

Under certain conditions the Cu‐Zn alloys are found to corrode by a process known as dezincification. As the term implies, zinc is removed from the alloy, leaving as a residue a porous mass of copper having little or no mechanical strength. Since corrosion is a surface phenomenon this process is initiated at the surface and, thereafter, gradually makes its way inwards until either leaks or cracks render the component useless for further service. Dezincification is a frequent type of corrosion failure encountered with brass handling waters contaminated with chloride ions.

Details

Anti-Corrosion Methods and Materials, vol. 11 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 8 May 2024

Hossa F. Al-Shareef, Ahmed M. Yousif, Rafaat Eleisawy, Ammar M. Mahmoud and Hamada Abdelwahab

This paper aims to prepare alkyd protective paint by using modified alkyd with 3,6-dichloro benzo[b]thiophene-2-carbonyl glutamic acid (DCBTGA) as a source of dicarboxylic acid…

42

Abstract

Purpose

This paper aims to prepare alkyd protective paint by using modified alkyd with 3,6-dichloro benzo[b]thiophene-2-carbonyl glutamic acid (DCBTGA) as a source of dicarboxylic acid and evaluating their anticorrosive properties compared with those of unmodified alkyd coatings for steel protection.

Design/methodology/approach

Short, medium and long oil alkyds, which represented as (0, 10, 20 and 30% excess-OH) according to the resin constants (Patton, 1962), were prepared through a condensation polymerization reaction via a solvent process in a one-step reaction. The modification of alkyd was carried out by using DCBTGA as a source of dicarboxylic acid. The prepared modified alkyd was confirmed by IR and NMR spectral analysis. The physicochemical, mechanical and anticorrosion performance properties of the considered modified coating formulations against unmodified blank coating were studied to confirm their application efficiency.

Findings

The best results in terms of physicochemical, mechanical and anticorrosion performance properties were found according to the following of this order activity: 30 replacements of the modifier (DCBTGA) for each hydroxyl continent were 30% Ex-OH > 20% Ex-OH > 10% Ex-OH > 0% Ex-OH, compared with that formulation containing unmodified alkyd, especially with increasing the modifier percent.

Originality/value

The prepared DCBTGA-modified resins can be used for different applications based on the type of alkyd and application.

Details

Pigment & Resin Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 1 March 1965

The dock gate cable seen in the photograph below is submerged in sea‐water for 12 hours out of every 24. Nine years ago an inspection showed the appearance of rust on the same…

20

Abstract

The dock gate cable seen in the photograph below is submerged in sea‐water for 12 hours out of every 24. Nine years ago an inspection showed the appearance of rust on the same cable and a replacement was considered. However, it was decided to try an application of the anti‐corrosive lubricant Voler V 200 R, a graphited compound made by Revol Ltd. The cable was ‘unlocked’ and impregnated with the compound. In the nine years since, no further trouble has been experienced. Another example of the protection afforded by V 200 R in the marine field is its use on the cables of Arctic survey ships. After treatment with the compound it is claimed that the life of these cables has been quadrupled.

Details

Anti-Corrosion Methods and Materials, vol. 12 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 4 July 2016

Moses M. Solomon, Saviour A. Umoren, Aniekemeabasi U. Israel and Idongesit G. Etim

The purpose of this paper is to evaluate the performance of polypropylene glycol (PPG), as a corrosion inhibitor for aluminium corrosion in 0.5 M H2SO4 solution at 303-333 K and…

141

Abstract

Purpose

The purpose of this paper is to evaluate the performance of polypropylene glycol (PPG), as a corrosion inhibitor for aluminium corrosion in 0.5 M H2SO4 solution at 303-333 K and the effect of addition of iodide ions on the corrosion inhibition efficacy of PPG.

Design/methodology/approach

The corrosion inhibition performance of PPG alone and on addition of iodide ions in the acid medium was evaluated using weight loss and electrochemical [electrochemical impedance spectroscopy (EIS), linear polarisation resistance (LPR) and potentiodynamic polarization (PDP)] methods as well as surface analysis approach at 303-333 K. The morphology of the corroding aluminium surface without and with the additives was visualised using scanning electron microscopy (SEM). The trend of inhibition efficiency with temperature was used to propose the mechanism of inhibition and type of adsorption.

Findings

Results obtained showed that PPG moderately retarded the corrosion of Al in 0.5 M H2SO4 solution. Addition of KI to PPG is found to synergistically improve the inhibitive ability of PPG. From the variation of inhibition efficiency, K_ads, and E_a, with rise in temperature, physisorption mechanism is proposed for the adsorption of PPG and PPG + KI onto the Al surface in 0.5 M H2SO4 solution. Polarisation results showed that PPG and PPG + KI acted as mixed type inhibitor. The adsorption of PPG and PPG + KI, respectively, onto the metal surface followed El-Awady et al. adsorption isotherm model. SEM and water contact angle analysis confirmed the adsorption of PPG and PPG + KI on Al surface.

Research limitations/implications

The research is limited to aqueous acid environment in aerated condition, and all tests were performed under static conditions.

Practical implications

The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal.

Originality/value

The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal.

Details

Pigment & Resin Technology, vol. 45 no. 4
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 11 January 2008

Mojca Slemnik

This paper aims to focus on the effects of temperature of the immersion media on the corrosion behaviour of differently heat‐treated X20Cr13 stainless steel.

411

Abstract

Purpose

This paper aims to focus on the effects of temperature of the immersion media on the corrosion behaviour of differently heat‐treated X20Cr13 stainless steel.

Design/methodology/approach

Specimens, quenched on air, quenched in oil and quenched in oil and then tempered, were tested during exposure in 0.1 M H2SO4 at 30, 40 and 50°C. The results were interpreted on the base of potentiodynamic and impedance measurements.

Findings

From the impedance spectra a reaction mechanism can be determined: after samples had reached and passed the active peak, expressed as the highest peak on the potentiodynamic curve, corrosion products at interfaces, which were adsorbed at metal surface, led to an increase in the charge transfer resistance. Elevated temperature of immersion media has had appreciable influence on the corrosion rate and adsorption of products, but at this temperature level did not affect the principle of corrosion reactions. Activation energies were calculated to exhibit temperature dependence of current density, which was the highest for the oil‐ and the lowest for the air‐quenched sample.

Originality/value

The paper provides further research on stainless steel, the corrosion behaviour of which can be controlled already by heat treatment.

Details

Anti-Corrosion Methods and Materials, vol. 55 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 17 October 2017

Hao Li, Shuai Zhang, Zhiran Yi, Jie Li, Aihua Sun, Jianjun Guo and Gaojie Xu

This work aims to evaluate the influence of rheological properties of building materials on the bonding quality and ultimate tensile strength in the fused deposition modeling…

1047

Abstract

Purpose

This work aims to evaluate the influence of rheological properties of building materials on the bonding quality and ultimate tensile strength in the fused deposition modeling (FDM) process, through the investigation of parts printed by semi-crystalline and amorphous resins. Little information is currently available about the influence of the crystalline nature on FDM-printed part quality.

Design/methodology/approach

Semi-crystalline polyamide 12 and amorphous acrylonitrile butadiene styrene (ABS) were used to assess the influence of rheological properties on bonding quality and the tensile strength, by varying three important process parameters: materials, liquefier temperature and raster orientation. A fractography of both tensile and freeze-fractured samples was also investigated.

Findings

The rheological properties, mainly the melt viscosity, were found to have a significant influence on the bonding quality of fused filaments. Better bonding quality and higher tensile strength of FDM parts printed with semi-crystalline PA12, as compared with amorphous ABS, are suggested to be a result of higher initial sintering rates owing to the lower melt viscosity of PA12 at low shear rates. Near-full dense PA12 parts were obtained by FDM.

Originality/value

This project provides a variety of data and insight regarding the effect of materials properties on the mechanical performance of FDM-printed parts. The results showed that FDM technique allows the production of PA12 parts with adequate mechanical performance, overcoming the greatest limitation of a dependence on amorphous thermoplastics as a feedstock for the production of prototypes.

Details

Rapid Prototyping Journal, vol. 23 no. 6
Type: Research Article
ISSN: 1355-2546

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