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Article
Publication date: 16 August 2019

Qian Hu, Saiwen Lu, Jing Liu and Feng Huang

The purpose of this paper is to clarify the influence of bicarbonate, chloride and outer electrode potential on crevice corrosion occurrence and development of X70 steel.

Abstract

Purpose

The purpose of this paper is to clarify the influence of bicarbonate, chloride and outer electrode potential on crevice corrosion occurrence and development of X70 steel.

Design/methodology/approach

The crevice corrosion behavior in NaHCO3 and NaCl solutions was investigated through modeling and experiments. The electrode potential and current density distribution were simulated, and the acidification of crevice solution was monitored in situ.

Findings

The bicarbonate concentration and outer electrode potential remarkably influenced the occurrence of crevice corrosion. The former changes the passivation curves, and the latter alters the initial potential. Moreover, chloride concentration exerted minimal influence. The location of acidification and pitting occurrences depended on the potential difference between the outer electrode and electrode at the active dissolution current peak.

Originality/value

This study provides a better understanding of the crevice corrosion behavior and mechanism under natural conditions.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 25 July 2019

Chi Zhang, Dajiang Zheng, Guang-Ling Song, Yang Guo, Ming Liu and Hamid Kia

This study aims to propose a simple experimental method to distinguish the galvanic corrosion, crevice corrosion and self-corrosion in metal/carbon fiber reinforced…

Abstract

Purpose

This study aims to propose a simple experimental method to distinguish the galvanic corrosion, crevice corrosion and self-corrosion in metal/carbon fiber reinforced polymer (CFRP) joints.

Design/methodology/approach

The corrosion behaviors of four different galvanic couples, whose anodes were Zn-coated DP590 steel and Al 6022, and cathodes were two kinds of CFRP, were investigated in immersion and GMW14872 cyclic conditions.

Findings

The results showed that the galvanic corrosion caused by direct contact between CFRP and metals was more serious than that caused by the jointing bolts. The corrosion damage caused by crevice corrosion was severer than that caused by galvanic corrosion. Self-corrosion was also significant, particularly under the cyclic salt spray condition.

Practical implications

Cyclic salt spray test may more reliably simulate the galvanic corrosion of a joint in industrial service environments, and real corrosion damage may be underestimated by a galvanic current measurement.

Originality/value

A deeper understanding of different corrosion mechanisms involved in CFRP/metal joints under different service conditions in industry has been given.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 December 1959

J.C. Rowlands

Under severely aggressive conditions, such as those experienced in the chemical industry, there has been extensive use of stainless steels in order to reduce corrosion

Abstract

Under severely aggressive conditions, such as those experienced in the chemical industry, there has been extensive use of stainless steels in order to reduce corrosion losses. The successful industrial use of stainless steels led to requests for information on the corrosion resistance of stainless steels and similar alloys in sea‐water. This paper was awarded a prize in the Essay competition organised by the Corrosion Group of the Society of Chemical Industry, 1959.

Details

Anti-Corrosion Methods and Materials, vol. 6 no. 12
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 December 1980

Tony Smith

Introduction There is no need to emphasize the problems that corrosion can cause. It is like a cancer cell, sometimes slowly developing for many years undetected and then…

Abstract

Introduction There is no need to emphasize the problems that corrosion can cause. It is like a cancer cell, sometimes slowly developing for many years undetected and then once observed it is too late to eliminate. The best course of action at that stage being to try and contain it. Corrosion is a very complex chemical action involving a metal with its environment and it is rare for all the various circumstances to repeat themselves, resulting in an identical corrosion situation.

Details

Anti-Corrosion Methods and Materials, vol. 27 no. 12
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 December 2002

A.K. Singh and G. Singh

Until recently, chlorine used to be an important chemical in bleaching process in paper industry, but as a result of environmental concerns, it is being replaced by…

Abstract

Until recently, chlorine used to be an important chemical in bleaching process in paper industry, but as a result of environmental concerns, it is being replaced by chlorine dioxide. However, chlorine dioxide is more corrosive in certain conditions. Plant personnel, therefore need to better understand the reactions taking place in the changed media and search for more resistant materials. It is with this in mind that the present work was undertaken. The paper reports the electrochemical polarisation measurements performed on stainless steels 316L, 317L, 2205 and 254SMO in chlorine dioxide solutions to observe localised corrosion. The results have been analysed with reference to Pourbaix diagrams, taking into account the various chemical species present in the bleach solutions. Conclusions drawn from electrochemical tests have been compared with those from long‐term laboratory and plant tests. Materials options are proposed on the optimal choice of materials for bleach plants, in a context of probable corrosion performance, capital cost and mechanical strength.

Details

Anti-Corrosion Methods and Materials, vol. 49 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 July 1978

J.B. Maylor

Introduction Although nickel is generally regarded as a corrosion resistant material its resistance to sea water is only moderate. In fast flowing sea water its corrosion

Abstract

Introduction Although nickel is generally regarded as a corrosion resistant material its resistance to sea water is only moderate. In fast flowing sea water its corrosion rate is very low; of the order of 0.0005 in/yr. Under stagnant conditions, however, it is susceptible to pitting and crevice corrosion attack. Consequently, alloying has been a common method of improving corrosion resistance to obtain a material having the excellent resistance of nickel to fast flowing sea water together with an improved resistance to pitting corrosion.

Details

Anti-Corrosion Methods and Materials, vol. 25 no. 7
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 March 1996

K.J. Lewis, J.H. Aklian, A. Sharaby and J.D. Zook

Explains corrosion protection and how it works. Discusses the effect of environmental legislation on corrosion protective paints, which necessitates the removal of…

Abstract

Explains corrosion protection and how it works. Discusses the effect of environmental legislation on corrosion protective paints, which necessitates the removal of solvents and toxic additives, making the protection weaker. In order to remedy this one must determine how protection is provided, which involves the separation of barrier properties and electrochemical passivation. Describes methods and tests involved in this and discusses the results. Concludes with recommendations and a suggestion for further tests.

Details

Aircraft Engineering and Aerospace Technology, vol. 68 no. 3
Type: Research Article
ISSN: 0002-2667

Keywords

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Article
Publication date: 1 February 1999

Robert S. Brown

Selecting the most suitable, cost‐efficient alloy for a given application should not be difficult if the methodology described in this paper is followed. The first step is…

Abstract

Selecting the most suitable, cost‐efficient alloy for a given application should not be difficult if the methodology described in this paper is followed. The first step is to identify those alloys with the desired corrosion resistance. Factors other than chemical composition have a bearing on an alloy’s corrosion resistance. Service environment and nature of the product application must also be considered. These conditions are discussed in the text. Consideration should be given to other key issues such as mechanical properties required as well as method of fabrication, design, condition and availability of the candidate alloy. To simplify selection, the author discusses severe corrodents and aggressive environments that are commonly encountered in the process industries, and describes the characteristics of alloys that might be considered for each type of corrosive service. Cross referenced charts position these alloys to show their relative resistance to each type of corrosion attack. While the paper is not designed to replace the technical expertise of a corrosion engineer, the author feels it can serve as a good starting point in the alloy selection process.

Details

Anti-Corrosion Methods and Materials, vol. 46 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 April 1985

Sven Bernhardsson and Rolf Mellström

The report is focused on Sanicro 28, an alloy with 27% Cr, 31% Ni, 3.5% Mo, 1% Cu, and its performance as compared with that of AISI 316. The results of potentiostatic and…

Abstract

The report is focused on Sanicro 28, an alloy with 27% Cr, 31% Ni, 3.5% Mo, 1% Cu, and its performance as compared with that of AISI 316. The results of potentiostatic and potentiodynamic measurements in neutral and acid chloride solutions are presented. Equilibrium calculations on hydrolysis and chloride complexing have been made. Results of long‐term tests and practical experience are reported.

Details

Anti-Corrosion Methods and Materials, vol. 32 no. 4
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 15 January 2019

Jun Wang, Zili Li, Gan Cui, JianGuo Liu, Chuanping Kong, Long Wang, Ge Gao and Jian Guo

The purpose of this paper is to study the corrosion behaviors of X70 steel under direct current (DC) interference at 0-1,200 A/m2 in simulated soil solution.

Abstract

Purpose

The purpose of this paper is to study the corrosion behaviors of X70 steel under direct current (DC) interference at 0-1,200 A/m2 in simulated soil solution.

Design/methodology/approach

The Tafel polarization curves of X70 steel under DC interference were tested using electrochemical method, the corrosion rate was calculated using weight-loss method and the change in steel surface was analyzed by optical microscopy.

Findings

The results showed that E-I polarization curves under 200-1,200 A/m2 interference were linear; with an increase in the DC density, the corrosion potential of X70 steel shifted positively, solution pH after the weight-loss tests increased and corrosion rate increased linearly. A mathematical relationship between polarization resistance Rp and current density was established. Corrosion morphology indicated that pitting corrosion and crevice corrosion occurred on the X70 steel under DC interference in simulated soil solution.

Originality/value

All tests were conducted at a relative higher DC density (200-1,200 A/m2). The linear fitting method is proposed to fit data of Tafel polarization curves under DC interference. This study provides guidelines for safe operation of X70 steel pipelines.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

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