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Article
Publication date: 18 August 2020

Amir Samadi, Reza Amini, Mehran Rostami, Pooneh Kardar and Michele Fedel

The purpose of this study was to evaluate the possibility of using conductive polymers such as polyaniline (PANI) as corrosion inhibitors for metals.

Abstract

Purpose

The purpose of this study was to evaluate the possibility of using conductive polymers such as polyaniline (PANI) as corrosion inhibitors for metals.

Design/methodology/approach

In this study, the effect of the addition of praseodymium (Pr3+) cations on the corrosion inhibition performance of PANI for AZ31 magnesium alloy was appraised through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests.

Findings

The results of EIS and potentiodynamic polarization tests indicated the improvement of corrosion resistance of AZ31 during different immersion times.

Research limitations/implications

This anti-corrosion ability of PANI/Pr3+ composite applies as non-toxic environmentally friendly corrosion inhibitor on the self-healing corrosion protection properties.

Practical implications

The conductive polymers are interested for many industries. The reported data can be used by the formulators working in the R&D departments.

Social implications

The anti-corrosion ability of PANI/Pr3+ composite present a novel and high effective route against metal corrosion besides application of toxic corrosion.

Originality/value

The application of titanium dioxide coating in the field of architectural heritage is a great challenge. Therefore, the main objective of this study is to study the synthesis, characterization and corrosion inhibition performance of Pr3+ cations doped PANI nano-fibers as an anti-corrosion additive for AZ31 magnesium alloy in 3.5 Wt.% NaCl solution.

Details

Pigment & Resin Technology, vol. 50 no. 1
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 8 May 2018

Nivin M. Ahmed, Mostafa G. Mohamed and Walaa M. Abd El-Gawad

New types of phosphate pigments which are appropriate alternatives for hazardous chromate pigments have been prepared and evaluated. These new pigments were prepared via a…

Abstract

Purpose

New types of phosphate pigments which are appropriate alternatives for hazardous chromate pigments have been prepared and evaluated. These new pigments were prepared via a new technique named core-shell. The core-shell materials consist of at least two separate phases with different chemical compositions. Recently, these materials have become more significant because they have the advantage of gathering the properties of both cores and shells that help to overcome the defects that they might possess individually. The purpose of this research is to develop a modified silica fume-phosphate core-shell pigment that contains 80-90 per cent of waste material (silica fume) and at the same time can offer promoted mechanical and anticorrosive properties than silica fume and they can also be compared with phosphates. The pigments have shells of Zn, Mn, Zn.Mn phosphates comprising about 10-20 per cent.

Design/methodology/approach

The prepared core-shell pigments have been characterized using several methods, which have then been integrated in alkyd paint formulations. The physical and mechanical properties of dry films and their corrosion prevention using accelerated laboratory test in 3.5 per cent NaCl for 28 days are estimated.

Findings

This study showed that the performance of these new pigments is highly efficient in corrosion protection, and it can be a suitable alternative to phosphate pigments despite containing phosphates which does not exceed 20 per cent of the composition.

Practical implications

Waste materials were reused in paints and only simple modification was used; their effectiveness was high and can be compared with well-known pigments.

Originality/value

Silica-phosphate core-shell pigments are environmentally friendly pigments that can replace other hazardous pigments (e.g. chromates and phosphates) with almost the same quality in their performance.

Details

Pigment & Resin Technology, vol. 47 no. 3
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 5 June 2017

Jianli Xie, Jiayuan Hu, Jundong Lu and Xinmin Li

The purpose of this paper was to study the corrosion control of B10 copper-nickel alloy using the LiOH-N2H4 compound inhibitors and to evaluate the feasibility of…

Abstract

Purpose

The purpose of this paper was to study the corrosion control of B10 copper-nickel alloy using the LiOH-N2H4 compound inhibitors and to evaluate the feasibility of replacing the original inhibitors (NaNO2-Na2MoO4) with the new ones (LiOH-N2H4) for the chilled water system in a nuclear unit.

Design/methodology/approach

The corrosion resistance performance of B10 copper-nickel alloy was evaluated during the whole replacement process of inhibiters using electrochemical tests and surface analysis techniques.

Findings

The results indicated that the corrosion of B10 copper-nickel alloy could be prevented effectively using LiOH to increase the pH value of solution higher than 10.0 and using N2H4 to consume dissolved oxygen. During the replacement process of inhibitors from NaNO2-Na2MoO4 to LiOH-N2H4, the corrosion resistance performance of B10 copper-nickel alloy had not decreased greatly. The new LiOH-N2H4 inhibitor, which could enhance the compactness of rust, was able to reduce the corrosion rate of rusted B10 metal.

Originality/value

It is feasible and operable to replace the NaNO2-Na2MoO4 inhibitors with the LiOH-N2H4 inhibitors for the corrosion prevention of B10 copper-nickel alloy. The research results can provide guidelines for the inhibitor selection of chilled water system in a nuclear unit.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 6 November 2017

Yanbao Guo, Hai Tan, Deguo Wang and Tao Meng

With the rapid development of rail transportation and energy-delivery systems, such as buried oil and gas pipelines and high-voltage transmission lines, the alternating…

Abstract

Purpose

With the rapid development of rail transportation and energy-delivery systems, such as buried oil and gas pipelines and high-voltage transmission lines, the alternating current (AC) corrosion of buried steel pipelines is becoming more serious. This paper aims to study the corrosion behaviours of Q235 buried steel pipelines induced by the alternating stray current, with a set of indoor simulated experiment apparatuses.

Design/methodology/approach

The corrosion of the coating holidays of the buried steel pipelines at various AC current densities from 0 to 200 A/m2 in the soil-simulating environment was revealed by the electrochemical and weight-loss methods.

Findings

The results showed that the corrosion potential of the steel shifted negatively obviously and the corrosion rate of the steel increased with the increasing of AC current density. At a low AC current density, the negative deviation of the corrosion potential of the steel was small and the increase of corrosion rate was slight. However, the negative deviation of the corrosion potential was remarkable and the corrosion rate was greatly increased at a relative higher AC current density. The geometrical shape of the corrosion images indicated the corrosion forms changed from uniform corrosion to local corrosion due to the increase of AC interference.

Originality/value

Investigation results are of benefit to provide a new strategy to forecast and evaluate the AC-induced corrosion of the buried pipelines which could improve the safety of pipeline transportation.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 6
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 April 1948

Of the kinds of food I have mentioned, I wish to deal in more detail with two of our staple items of food, milk and meat.

Abstract

Of the kinds of food I have mentioned, I wish to deal in more detail with two of our staple items of food, milk and meat.

Details

British Food Journal, vol. 50 no. 4
Type: Research Article
ISSN: 0007-070X

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Article
Publication date: 1 January 1978

SYNOPSIS DURING the last ten years or more an outwardly unnoticeable change has been taking place on board a variety of ships, in that the traditional method of heating…

Abstract

SYNOPSIS DURING the last ten years or more an outwardly unnoticeable change has been taking place on board a variety of ships, in that the traditional method of heating cargo, engine room services and accommodation by steam, has been replaced by a thermal fluid which remains in the liquid phase throughout the entire heating system.

Details

Industrial Lubrication and Tribology, vol. 30 no. 1
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 1 September 1995

Richard Catt

The second part of the “Small urban spaces” seriescompares and contrasts the qualities of wrought iron, cast iron andsteel railings, from both the aesthetic and the…

Abstract

The second part of the “Small urban spaces” series compares and contrasts the qualities of wrought iron, cast iron and steel railings, from both the aesthetic and the practical point of view. Describes the composition and method of manufacture of the three types of iron. Suggests the best methods of preservation, conservation and repair for each type.

Details

Structural Survey, vol. 13 no. 3
Type: Research Article
ISSN: 0263-080X

Keywords

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Article
Publication date: 1 March 1970

This is indeed the age of revolution, when timeless attitudes are changing and new ways of living being born. To most it is a bewildering complex, with uneasy forbodirtgs…

Abstract

This is indeed the age of revolution, when timeless attitudes are changing and new ways of living being born. To most it is a bewildering complex, with uneasy forbodirtgs of the outcome. Improvement and change, there must always be—although change is not necessarily progress—but with unrest in the schools, universities and industry, one naturally questions if this is the right time for such sweeping reorganization as now seems certain to take place in local government and in the structure of the national health service. These services have so far escaped the destructive influences working havoc in other spheres. Area health boards to administer all branches of the national health service, including those which the National Health Service Act, 1946 allowed local health authorities to retain, were recommended by the Porritt Committee a number of years ago, when it reviewed the working of the service.

Details

British Food Journal, vol. 72 no. 3
Type: Research Article
ISSN: 0007-070X

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