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Article
Publication date: 1 February 1975

P.B. Shibad and J. Balachandra

Ti and its alloys with Hf additions up to 50% (by weight) have been subjected to corrosion in organic acids and their mixtures, and 3% NaCl, 5% NaOH solutions under boiling…

40

Abstract

Ti and its alloys with Hf additions up to 50% (by weight) have been subjected to corrosion in organic acids and their mixtures, and 3% NaCl, 5% NaOH solutions under boiling conditions for their performance by weight change measurements. These alloys are found to be unaffected in boiling 3% NaCl and 5% NaOH solutions. Amongst titanium and Ti‐Hf alloys, Ti 50%‐Hf 50% behaves the best in the acids and their mixtures with the exception of HNO3. Correlation between polarisation characteristics and dissolution rates in boiling acids is seen only in 20% ortho H3PO4.

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Anti-Corrosion Methods and Materials, vol. 22 no. 2
Type: Research Article
ISSN: 0003-5599

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Publication date: 1 December 1976

P.R. Shibad and J. Balachandra

The corrosion of Ti and Ti‐Hf25% alloy at 28°C (room temperature) in 20% MC1 and 20% H2SO4 solutions in the presence of 1g/litre of cations such as Fe+3, Cu+2, Ni+2 in each case…

50

Abstract

The corrosion of Ti and Ti‐Hf25% alloy at 28°C (room temperature) in 20% MC1 and 20% H2SO4 solutions in the presence of 1g/litre of cations such as Fe+3, Cu+2, Ni+2 in each case and of several organic inhibitors has been studied. Cationic additions of Fe+3 and Cu+2 to 20% H2SO4 inhibit much better than similar additions to 20% HC1 solution and generally exhibit higher inhibitor efficiencies than the organic inhibitors studied. The addtions of Fe+3 and Cu+2 to corroding media shift the electrode potentials to noble values. However Ni+2 additions are not found to be effective.

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Anti-Corrosion Methods and Materials, vol. 23 no. 12
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 February 1968

P.R. Shibad and J. Balachandra

The influence of variables such as temperature, agitation, oxygenation on the corrosion of aluminium, copper, nickel base alloys in 3% NaCI solution has been studied by…

18

Abstract

The influence of variables such as temperature, agitation, oxygenation on the corrosion of aluminium, copper, nickel base alloys in 3% NaCI solution has been studied by electrochemical and weight loss measurements. It has been observed that the corrosion process is under cathodic control for all the alloys studied. Some nickel and aluminium base alloys merit consideration as a substitute for ferrous alloys in salt water under conditions similar to those reported in this paper.

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Anti-Corrosion Methods and Materials, vol. 15 no. 2
Type: Research Article
ISSN: 0003-5599

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Publication date: 1 February 1967

P.R. Shibad and J. Balachandra

The influence of such variables as temperature, agitation, oxygenation, etc., on the corrosion of aluminium bronze specimens with and without heat‐treatment in 3 and 24% NaCI…

57

Abstract

The influence of such variables as temperature, agitation, oxygenation, etc., on the corrosion of aluminium bronze specimens with and without heat‐treatment in 3 and 24% NaCI solution has been studied by electrochemical methods and weight loss measurements. It has been observed that the corrosion process is under cathodic control under most of the experimental conditions. Properly heat‐treated specimens with beta‐phase present in preference to gamma2‐phase exhibit better corrosion‐resistance. Thus, with the improved corrosion‐resistance shown by suitably heat‐treated alloys the aluminium bronzes merit consideration as a substitute for other ferrous alloys for use in salt water.

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Anti-Corrosion Methods and Materials, vol. 14 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 2004

G. Bereket, A. Pınarbaşı and C. Öğretir

The effect of benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives on the corrosion of aluminium in 0.1 M HCl has been investigated by a potentiostatic polarisation…

458

Abstract

The effect of benzimidazole‐2‐tione and benzoxazole‐2‐tione derivatives on the corrosion of aluminium in 0.1 M HCl has been investigated by a potentiostatic polarisation technique. Inhibition efficiencies were found to follow the order: benzimidazole‐2‐tione > 5‐methyl benzimidazole‐2‐tione > 5‐chloro benzimidazole‐2‐tione, while that of benzoxazole‐2‐tione derivatives were found to follow the order: 5‐methyl benzoxazole‐2‐tione > benzoxazole‐2‐tione > 5‐chloro benzoxazole‐2‐tione > 5‐nitro benzoxazole‐2‐tione. The inhibitive action of these heterocyclic compounds was mainly due to adsorption on the metal surfaces, which show parallelism with the calculated total negative charge of each of the molecules. Thermodynamic parameters, such as values of free energies of adsorption ΔGads and values of equilibrium constants Kads, were determined. Activation energies Ea, activation enthalpies ΔH* and activation entropies ΔS* were determined from the corrosion currents measured at different temperatures.

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Anti-Corrosion Methods and Materials, vol. 51 no. 4
Type: Research Article
ISSN: 0003-5599

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