A light yellow luminescence is emitted when an adhesive binding two sheets of paper is stretched. The adhesive present on the paper is found to be fluorescent. The paper, even…
Abstract
A light yellow luminescence is emitted when an adhesive binding two sheets of paper is stretched. The adhesive present on the paper is found to be fluorescent. The paper, even without the adhesive, is found to be fluorescent. The fluorescent nature of the materials has been confirmed by fluorescence spectra.
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Susai Rajendran, B.V. Apparao and N. Palaniswamy
The formulation consisting of 50ppm polyacrylamide (PAA), 300ppm phenyl phosphonic acid (PPA) and 50ppm Zn2+ has 95 per cent inhibition efficiency in controlling corrosion of mild…
Abstract
The formulation consisting of 50ppm polyacrylamide (PAA), 300ppm phenyl phosphonic acid (PPA) and 50ppm Zn2+ has 95 per cent inhibition efficiency in controlling corrosion of mild steel in a neutral aqueous environment, containing 60ppm Cl—, a situation commonly encountered in cooling water systems. A discussion of mechanistic aspects of corrosion inhibition is based on the results obtained from a potentiostatic polarization study, UV‐visible, FTIR and luminescence spectra. The protective film is found to be luminescent and to consist of Fe2+‐PAA complex, Fe2+‐PPA complex and Zn(OH)2.
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P. Satyabama, Susai Rajendran and Tuan Anh Nguyen
This paper aims to evaluate the inhibition efficiency (IE) of oxalate ions in controlling corrosion of aluminum at pH 10.
Abstract
Purpose
This paper aims to evaluate the inhibition efficiency (IE) of oxalate ions in controlling corrosion of aluminum at pH 10.
Design/methodology/approach
The IE has been determined by the classical weight loss method. The corrosion behavior of aluminum was investigated by using potentiodynamic polarization and electrochemical impedance measurements. Ultra violet (UV)-visible and Fluorescence spectra have been used to analyze the film formed on the aluminum surface after immersion.
Findings
The maximum IE was 88 per cent, which was offered by a mixture of 250 ppm oxalate ions and 50 ppm [Zn2+]. Potentiodynamic polarization data revealed that the protective film was formed on the metal surface. UV-visible and Fluorescence spectra indicated the presence of Al3+−oxalate complex in the protective film formed on aluminum substrate after immersion in [OX]/[Zn2+] solution.
Originality/value
The findings of this work shed more light on the corrosion inhibition of aluminum by oxalate self-assembling monolayers.
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Susai Rajendran, B.V. Apparao and N. Palaniswamy
The synergistic effect of sodium salt of ethyl phosphonic acid (EPA) and Zn2+ on the inhibition of corrosion of mild steel in neutral aqueous environment containing 60 ppm Cl‐ has…
Abstract
The synergistic effect of sodium salt of ethyl phosphonic acid (EPA) and Zn2+ on the inhibition of corrosion of mild steel in neutral aqueous environment containing 60 ppm Cl‐ has been evaluated by the weight‐loss method. The formulation consisting of 300 ppm EPA and 300 ppm Zn2+ has 88 per cent inhibition efficiency. The nature of the protective film formed on the metal surface has been analysed by x‐ray diffraction, FTIR, uv‐visible and luminescence spectra. The protective film is found to be luminescent and to consist of Fe2+ ‐EPA complex, Zn (OH)2 and a very thin film of oxides of iron.
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Susai Rajendran B. and N. Palaniswamy
The formulation consisting of 300ppm 1‐hydroxyethane‐1, 1‐diphosphonic acid (HEDP) and 50ppm Zn2+ offered 99 per cent inhibition to the corrosion of mild steel immersed in neutral…
Abstract
The formulation consisting of 300ppm 1‐hydroxyethane‐1, 1‐diphosphonic acid (HEDP) and 50ppm Zn2+ offered 99 per cent inhibition to the corrosion of mild steel immersed in neutral aqueous environment containing 60ppm chloride. This formulation functioned as a mixed inhibitor. The protective film was found to be luminescent and to consist of Fe2+‐HEDP complex and Zn(OH)2.
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Susai Rajendran, B.V. Apparao, V. Periasamy, G. Karthikeyan and N. Palaniswamy
The formulation consisting of 50ppm ATMP and 300ppm MoO42‐ had only 32 per cent efficiency in inhibiting the corrosion of mild steel immersed in a neutral aqueous environment…
Abstract
The formulation consisting of 50ppm ATMP and 300ppm MoO42‐ had only 32 per cent efficiency in inhibiting the corrosion of mild steel immersed in a neutral aqueous environment containing 60ppm C1‐, whereas the ATMP (50ppm) ‐ MoO42‐ (300ppm) ‐ Zn2+ (50ppm) system had 96 per cent inhibition efficiency. The lower inhibition efficiency in the former case was due to the dissolution of the protective film formed on the metal surface, and getting precipitated in the bulk of the solution; this system controlled the anodic reaction only. The latter system controlled both the anodic and cathodic reactions; the dissolution of the protective film formed on the metal surface was reduced to a greater extent.
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Susai Rajendran, A. Peter Pascal Regis and D.C. Trivedi
Aqueous sodium chloride solution, containing benzamide was electrolysed (pH = 2), using platinised titanium anode and graphite cathode. The filtrate of the reaction mixture (pH …
Abstract
Aqueous sodium chloride solution, containing benzamide was electrolysed (pH = 2), using platinised titanium anode and graphite cathode. The filtrate of the reaction mixture (pH = 4.5) was diazotised and coupled with α‐naphthol in NaOH and also with β‐naphthol in NaOH. Dyes were produced. These dyes were matched with the standard dyes prepared from aniline. Uv‐visible absorption spectral study reveals that the dyes produced are slightly different from the standard dyes. During the course of the reaction benzamide is converted into aniline with a long chain polymeric unit having a free amino end; and/or a polymeric unit which generates a free amino end during the process of diazotisation.
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Susai Rajendran, A. Peter Pascal Regis and D.C. Trivedi
Benzamide has been made to undergo Hofmann rearrangement, in the presence of hypochlorite (OCl‐) generated in situ, by the electrolysis of sodium chloride solution using…
Abstract
Benzamide has been made to undergo Hofmann rearrangement, in the presence of hypochlorite (OCl‐) generated in situ, by the electrolysis of sodium chloride solution using platinised titanium anode and graphite cathode. The product is not a pure primary amine, namely aniline; but a polymeric aniline derivative is produced. It has a free amino end; and/or a free amino end is generated during the process of diazotisation. The product has been diazotised and coupled with naphthols to give dyes. The nature of the dyes have been analysed by uv‐visible spectral studies. The dyes are slightly different from the dyes prepared from pure aniline.