Effects of temperature on dezincification and electrochemical behaviour of 70—30 brass in sulphuric acid

Abbas, Mohammad

doi:10.1179/000705991798269017

Cited by 26 publications

(7 citation statements)

References 8 publications

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“…6), the corrosion rate of copper is important compared with zinc from the first minutes of immersion in the case of 70Cu30Zn, whereas the corrosion rate of copper is also important, but only after 3 hours of immersion time of 60Cu40Zn. These results explain that the zinc corrodes more selectively than copper [4,9,27]. The addition of PMT at 10 -3 M slows down the dissolution rate of both components (Cu and Zn); however, we noted that the corrosion rate of zinc, in this case, is more important than that of copper.…”

Section: Methodsmentioning

confidence: 61%

“…Moreover, brasses are harder and solid. But their exhibition in acid media creates problems of corrosion [1][2][3][4][5][6][7][8]. When the brasses, containing more than 15% of zinc, are exposed in corrosive environments, they are affected not only by general corrosion damage, but also by dezincification process involving preferential dissolution of zinc, leaving a spongy mass of copper on the alloy surface [9].…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of Brasses Corrosion in Nitric Acid with and without PMT

Mihit

Belkhaouda

Bazzi

et al. 2007

Port. Electrochim. Acta

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The comparative study of corrosion behaviour of brasses 70Cu30Zn and 60Cu40Zn in HNO 3 solution in absence and in presence of 1-phenyl-5-mercapto-1,2,3,4-tetrazole (PMT) was studied by gravimetric and electrochemical methods. Results obtained are in good agreement and reveal that the corrosion rate depends on immersion time and zinc content in the alloy. Copper and zinc losses from each specimen studied, at various immersion times, were estimated by Atomic Adsorption Spectroscopic analysis. This shows that the inhibition efficiency of the inhibitor towards copper is more significant than zinc. PMT was adsorbed preferentially on the copper surface and inhibits the process of corrosion of brasses in the nitric acid medium.

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Section: Methodsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Behaviour of Brasses Corrosion in Nitric Acid with and without PMT

Mihit

Belkhaouda

Bazzi

et al. 2007

Port. Electrochim. Acta

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“…Hence, the solutions were analysed to determine the leaching characteristics of the brass alloys. The solutions left after polarisation measurements were analysed for copper and zinc by atomic absorption spectrometer to measure the amounts of metal ions leached out from the alloys (Abbas, 1991). The solutions containing the optimum concentration of the inhibitor were chosen.…”

Section: Methodsmentioning

confidence: 99%

Corrosion inhibition of brass by benzotriazole derivatives in NaCl solution

Ravichandran

Nanjundan

Rajendran

2005

Anti-Corrosion Methods and Materials

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PurposeCopper and its alloys are widely used in industries because of their good resistance to corrosion and are often used in cooling water systems. Brass has been widely used for shipboard condensers, power plant condensers and petrochemical heat exchangers. Brass is susceptible to the corrosion process known as dezincification by means of which brass looses its valuable physical and mechanical properties leading to failure of structure. The aim of this investigation was to control the dezincification of brass in 3 per cent NaCl solution using benzotriazole (BTA) derivatives.Design/methodology/approachBTA derivatives namely 1‐hydroxymethylbenzotriazole (HBTA) and N,N‐dibenzotriazol‐l‐ylmethylamine(ABTA) were synthesised and their inhibition behaviour on brass in 3 per cent NaCl solution was investigated by the weight‐loss method, potentiodynamic polarisation, electrochemical impedance and solution analysis techniques. The morphology of the brass after corrosion in the presence and absence of the BTA derivatives was examined using scanning electron microscopy (SEM).FindingsPotentiodynamic polarisation studies showed that the BTA derivatives investigated were mixed type inhibitors, inhibiting the corrosion of brass by blocking the active sites of the brass surface. Changes in the impedance parameters (charge transfer resistance and double layer capacitance) were related to the adsorption of BTA derivatives on the brass surface, leading to the formation of a protective film. Solution analysis revealed that the BTA derivatives excellently controlled the corrosion of brass. SEM micrographs showed the formation of compact surface film on the brass surface in the presence of inhibitors, thereby providing better corrosion inhibition.Originality/valueContributes to research on corrosion protection for copper and its alloys.

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“…where the ratio (Zn/Cu) sol is determined from solution analysis and (Zn/Cu) alloy is the weight-percent ratio of the elements in the alloy [6,28].…”

Section: Solution Analysismentioning

confidence: 99%

“…Brass has been widely used for shipboard condensers, power plant condensers and petrochemical heat exchangers [4][5][6][7]. Dezincification of brass is one of the well-known and common processes by means of which brass looses its valuable physical and mechanical properties leading to structural failure.…”

Section: Introductionmentioning

confidence: 99%

Effect of benzotriazole derivatives on the corrosion and dezincification of brass in neutral chloride solution

Ravichandran

Nanjundan

Rajendran

2004

Journal of Applied Electrochemistry

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The effect of novel corrosion inhibitors, benzotriazole derivatives namely N,N-dibenzotriazol-1-ylmethylamine (DBMA), and 2-hydroxy ethyl benzotriazole (HEBTA) on the corrosion and dezincification of a 65/35 brass in 3% NaCl has been investigated by weight-loss, potentiodynamic polarization, electrochemical impedance and solution analysis techniques. Polarization studies clearly indicated that the benzotriazole derivatives behave as anodic inhibitors for brass in chloride solutions. They decrease the anodic reaction rate more strongly than the cathodic reaction rate and render the open circuit potential of brass more positive in NaCl solutions. Solution analysis revealed the decrease in dissolution of both copper and zinc in the presence of these inhibitors.

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Effects of temperature on dezincification and electrochemical behaviour of 70—30 brass in sulphuric acid

Cited by 26 publications

References 8 publications

Behaviour of Brasses Corrosion in Nitric Acid with and without PMT

Behaviour of Brasses Corrosion in Nitric Acid with and without PMT

Corrosion inhibition of brass by benzotriazole derivatives in NaCl solution

Effect of benzotriazole derivatives on the corrosion and dezincification of brass in neutral chloride solution

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