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Article
Publication date: 1 April 1969

J.A. von Fraunhofer and T.S. de Gromoboy

Cathodic protection by galvanic or impressed current techniques is probably the most favoured method of obviating the corrosion of buried and immersed metals. The…

Abstract

Cathodic protection by galvanic or impressed current techniques is probably the most favoured method of obviating the corrosion of buried and immersed metals. The theoretical principles and the economics involved in such protection are well established now and have been the subject of numerous papers, monographs and reviews. Cathodic protection is, however, still far from being an infallible method of corrosion prevention primarily because (a) the cathodic protection conditions necessarily change with the environment, (b) complete corrosion protection is rarely achieved in practice (see below), and (c) corrosion of an apparently protected structure may occur through the presence of stray currents

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Anti-Corrosion Methods and Materials, vol. 16 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 April 2003

Shiwei William Guan

This paper gives an overview on the evolution and standards development of the external corrosion protection systems used for flammable and combustible liquids underground…

Abstract

This paper gives an overview on the evolution and standards development of the external corrosion protection systems used for flammable and combustible liquids underground storage tanks (USTs) in North America. The paper first describes the different types of corrosion protected USTs for flammable and combustible liquids in North America. It then reviews the advantages and disadvantages of each of the corrosion protection systems used. Finally, it looks forward to some of the technical trends in the North American UST industry and the standard certification process for underground tank external corrosion protection, with updates on the technology and standards in the international UST industry.

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Anti-Corrosion Methods and Materials, vol. 50 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 2 November 2015

Juliusz Orlikowski, Kazimierz Darowicki, Agata Jazdzewska and Magdalena Jarzynka

The purpose of this paper is to implement the corrosion protection method for steel pipes used in a municipal water-pipe network. Results of an inhibitor protection system…

Abstract

Purpose

The purpose of this paper is to implement the corrosion protection method for steel pipes used in a municipal water-pipe network. Results of an inhibitor protection system installed on the system are presented. Inhibitor protection was required due to the high corrosivity of the water collected by a surface intake, which had resulted in a large number of failures and low water quality, due to the presence of corrosion products.

Design/methodology/approach

To assess the effectiveness of protection and to control the optimum dose of the inhibitor dispensed, an automatic system of corrosion monitoring was used, together with an assessment of water corrosiveness based on measurements of physical and chemical properties of water.

Findings

Calcium polyphosphate, in the role of a non-toxic corrosion inhibitor, showed significant effectiveness as a anticorrosive and its results were fully noticeable after several years following the commencement of protection. Corrosion monitoring has shown that the effectiveness of inhibitor protection is highest in the summer season, when the water is characterised as being in its most corrosive form.

Originality/value

A reduction in the corrosion rate improves the quality of water and its chemical parameters fall within the standard range for water intended for consumption. The corrosion inhibitor action accelerates the formation of a layer limiting the corrosion rate. In this case, stable corrosion rates may be obtained after only the first year. In terms of the designing systems for monitoring corrosion in water systems, this is very important information as reliable results can be obtained for a long period after the launch of the system.

Details

Anti-Corrosion Methods and Materials, vol. 62 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 October 2003

S.O. Jekayinfa, J.O. Ojediran and P.O. Okekunle

In order to evaluate the effectiveness of the corrosion prevention practices applied to agricultural equipment manufactured and used in Nigeria, it is necessary to…

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Abstract

In order to evaluate the effectiveness of the corrosion prevention practices applied to agricultural equipment manufactured and used in Nigeria, it is necessary to identify the various corrosion prevention methods and specify the contribution and the efficiency of each method to corrosion protection. This paper outlines the basic corrosion prevention methods used in practice and attempts to evaluate the effectiveness of their use in relation to agricultural service in Nigeria. The results of this study indicated the use of oils, fats, waxes and lubricants on metal parts, spraying with gasoline on corrosion‐sensitive parts constituted the majority of applied corrosion protection in industries where the equipment is manufactured and/or used. The study concluded by giving practical recommendations that are essential for improving corrosion prevention in the Nigerian agricultural industry.

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Anti-Corrosion Methods and Materials, vol. 50 no. 5
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 January 1969

K.A. van Oeferen

Some more recent examples of the correct design of steel structures to protect them against corrosion are given, using steel tubes as the structural element. They show…

Abstract

Some more recent examples of the correct design of steel structures to protect them against corrosion are given, using steel tubes as the structural element. They show how, by the use of appropriate design measures, a reduction in the corrosion load will result from the use of steel tubes. The behaviour of steel structures with corrosion protection is shown, and also cases of corrosion on steel tube structures are discussed. In addition, examples of damage to anti‐corrosive coatings of steel tube structures are given. The points which must be watched during the painting of steel tubes, and their application as scaffolding for corrosion protection operations are set out.

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Anti-Corrosion Methods and Materials, vol. 16 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 29 May 2007

Mashal Sheban, Muna Abu‐Dalo, Ayman Ababneh and Silvana Andreescu

The aim of this research was to develop corrosion protection systems for reinforced concrete structures under chloride attack. Benzotriazole (BTA) and BTA derivatives were…

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Abstract

Purpose

The aim of this research was to develop corrosion protection systems for reinforced concrete structures under chloride attack. Benzotriazole (BTA) and BTA derivatives were used as corrosion protection materials for the steel.

Design/methodology/approach

The effect of BTA and four other BTA derivatives on the corrosion resistance of steel in simulated concrete pore (SCP) solutions was studied. BTA derivatives were used as two separate protection systems: inhibition and pickling protection systems. The experiments were performed in SCP solutions which simulated concrete with and without severe chloride attacks. Electrochemical techniques, i.e. potentiodynamic polarization and electrochemical impedance, and Fourier transform infrared spectroscopy (FTIR) were used to assess the steel corrosion protection systems.

Findings

The potentiodynamic polarization studies showed an increase in the pitting potential for all protection systems tested. In addition, a large increase in the steel solution interfacial resistance was observed by electrochemical impedance studies (EIS) due to the formation of steel‐BTA derivatives complex on the surface. This film was formed on the steel surface with either mono‐or bi‐dentate bonds between the triazolic nitrogen ring and the steel surface as shown by the FTIR.

Research limitations/implications

BTA derivatives provided good protection for steel in SCP solutions, indicating their applicability in reinforced concrete structures. However, tests using reinforced concrete samples are required to study possible interactions between steel, BTA derivatives and concrete constitutes, e.g. sand, gravel, cement and chemical admixtures. These BTA‐based systems also should be studied under carbonation attack.

Originality/value

BTA derivatives provided a good protection for steel in the SCP solutions, and this indicates the applicability to use them in reinforced concrete structures.

Details

Anti-Corrosion Methods and Materials, vol. 54 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 June 2015

Diego Hernández-Martínez, Ulises León-Silva and Maria Elena Nicho

The purpose of this paper is to study the effect of thermal treatment on the corrosion protection of steel by using poly(3-hexylthiophene) (P3HT) and P3HT/PS(polystyrene…

Abstract

Purpose

The purpose of this paper is to study the effect of thermal treatment on the corrosion protection of steel by using poly(3-hexylthiophene) (P3HT) and P3HT/PS(polystyrene) or P3HT/PMMA(polymethyl methacrylate) blends coatings in sulfuric acid solution.

Design/methodology/approach

The polymer coatings were thermally treated at two different temperatures (100 and 200°C, respectively) and were compared with the polymer coatings dried at room temperature in their application as protective coatings against corrosion of A36 steel. The corrosion resistance of polymer coatings-covered steel substrates was evaluated by using potentiodynamic polarization curves and linear polarization resistance.

Findings

At 25 and 100°C, polymer coatings showed a better protection of the A36 steel, and the corrosion rate diminished in three orders of magnitude with regard to the bare steel. Morphological study showed that the increased temperature benefited the integration of the two polymeric phases; however; the temperature of 200°C affected the film quality, generated cracks and holes, which affected the barrier properties of the coatings.

Research limitations/implications

The research involved the synthesis and physicochemical characterization of the polymeric coatings (P3HT, PS/P3HT y PMMA/P3HT), as well as their application as coatings in the steel to prevent corrosion. The effect of thermal treatment of the protective coatings on steel corrosion was studied.

Practical implications

This paper aims to contribute to reducing the problem of metal corrosion through the use of polymer coatings.

Social implications

Today, majority of metal surfaces are subject under the protection to prevent a very common phenomenon, that is corrosion. Corrosion is the result of chemical reactions that occur between a metal or a metal alloy and its environment. Corrosion creates a degradation of the material that has an impact on some economic, environmental and even social aspects, here the great importance of its protection.

Originality/value

It is shown in this study that the P3HT coating provides better corrosion protection of the A36 steel than the PS and PMMA coatings. However, mixtures of P3HT with PMMA and PS protected the steel from corrosion by two and three orders of magnitude similar to the simple P3HT coating. Polymer blends improved adhesion to the substrate and mechanical property of the coating, and in addition, the polymer blends made cheaper coating.

Details

Anti-Corrosion Methods and Materials, vol. 62 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 2 January 2018

Joseph Raj Xavier

This paper aims to investigate the effect of introducing nano-ceria (CeO2) particles to the epoxy coatings on mild steel in natural seawater.

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Abstract

Purpose

This paper aims to investigate the effect of introducing nano-ceria (CeO2) particles to the epoxy coatings on mild steel in natural seawater.

Design/methodology/approach

The epoxy–ceria nanoparticles were coated with mild steel using a wire-wound draw-down bar method. The effects of ceria nanoparticles on the corrosion resistance of epoxy-coated samples were analyzed using scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS).

Findings

Localized measurements such as oxygen consumption and iron dissolution were observed using SECM in natural seawater in the epoxy-coated sample. The increase in film resistance (Rf) and charge transfer resistance (Rct) values by the addition of nano-ceria particles in the epoxy coating was measured from EIS measurements after wet and dry cyclic corrosion test. Scanning electron microscope (SEM)/energy dispersive X-ray spectroscope (EDX) analysis showed that complex oxides of nano-ceria were enriched in corrosion products at a scratched area of the coated mild steel after corrosion testing. Focused ion beam-transmission electron microscope (FIB-TEM) analysis confirmed the presence of the nanoscale oxide layers of ceria in the rust of the steel.

Research limitations/implications

The tip current at −0.70 V for the epoxy–CeO2-coated sample decreased rapidly because of cathodic reduction of the dissolved oxygen. The increase in film resistance (Rf) and charge transfer resistance (Rct) values by the addition of nano-ceria particles in the epoxy coating were measured from EIS measurements after wet and dry cyclic corrosion test.

Practical implications

The presence of complex oxide layers of nano-ceria layers protects the coated steel from rusting.

Social implications

The use of this nano-ceria for corrosion protection is environment-friendly.

Originality/value

The results of this study indicated the significant effect of nano-ceria particles on the protective performance and corrosion resistance of the epoxy coating on mild steel. The dissolution of Fe2+ was lower in the epoxy–ceria nanoparticle-coated mild steel than that of the epoxy-coated mild steel resulting in a lower anodic current of steel. The increase in film resistance and the charge transfer resistance showed that the nano-ceria particles and the formation of complex oxides provide better barrier protection to the coating metal surfaces.

Details

Anti-Corrosion Methods and Materials, vol. 65 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 November 1964

P. Walker

This article describes work carried out in UKAEA laboratories to examine the possibility of using protective coatings on cadmium plate—such as that used to protect mild…

Abstract

This article describes work carried out in UKAEA laboratories to examine the possibility of using protective coatings on cadmium plate—such as that used to protect mild steel—in order to prevent or minimise corrosion due to hostile organic vapours. The degree of attack by vapours of acetic, formic, butyric and propionic acids and formaldehyde on cadmium has been determined and it has been found that attack can be eliminated in many cases by the application of a chlorinated‐rubber lacquer to the metal. A pretreatment primer of the two‐pack etch‐primer type is considered essential for good protection. The protection provided by nine coatings over three pretreatments is described in detail.

Details

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

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Article
Publication date: 1 February 1998

Jyoti Lata Pandey and M.K. Banerjee

Concrete forms a major component of the national infrastructure. Corrosion of reinforced steels embedded in concrete has recently received wide attention in R&D…

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Abstract

Concrete forms a major component of the national infrastructure. Corrosion of reinforced steels embedded in concrete has recently received wide attention in R&D programmes. Different cases have been reported showing failures of concrete structures which means huge loss. An attempt has been made to identify the different factors affecting the corrosion of embedded steel. Comparative evaluation of different protective schemes use of additives in concrete admixtures and the application of the cathodic protection technique has been discussed.

Details

Anti-Corrosion Methods and Materials, vol. 45 no. 1
Type: Research Article
ISSN: 0003-5599

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