Nicotinsäure als Inhibitor der Korrosion von Aluminium‐Magnesium‐Legierungen in salzsauren Lösungen

Subrahmanyam, D. V.; Char, T.L. Rama

doi:10.1002/maco.19670180804

Materials & Corrosion

1967

DOI: 10.1002/maco.19670180804

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Nicotinsäure als Inhibitor der Korrosion von Aluminium‐Magnesium‐Legierungen in salzsauren Lösungen

D. V. Subrahmanyam

T.L. Rama Char

Abstract: Untersucht wurde die Hemmwirkung von Nicotinsäure auf die Korrosion von Reinaluminium, Aluminium 98,8, Al‐Zn‐und Al‐Cu‐Legierungen in Salzsäure. Ausführlich diskutiert wird die Hemmwirkung abgestufter Nicotinsäuremengen auf die Salzsäurelöslichkeit einer Al‐Mg‐Mn‐Legierung in Abbängigkeit von Säurekonzentration und Versuchsdauer. Die Gegnüberstellung der Kathodenpolarisation und des Gewichtsverlustes zeigt, daß diese Legierung wirkungsvoll kathodisch geschützt werden kann.

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“…Both the inhibitors increase the cathode and anode polarisation considerably. DETAILED investigations have been carried out in this laboratory on the inhibition of the corrosion of aluminium and its alloys with thiourea 1-8 and nicotinic acid [1][2][3][4][5][6][9][10][11] , as well as of steel with nicotinic acid 12 in hydrochloric acid solutions. A review article 13 on thiourea and its derivatives as corrosion inhibitors covers the literature up to 1967.…”

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Inhibition of the corrosion of brass in nitric acid

Padma

Char²

1969

Anti-Corrosion Methods and Materials

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.Thiourea and nicotinic acid are good inhibitors for the corrosion of brass in nitric acid solutions. Polarisation studies indicate that the anode polarisation with nicotinic acid is less than that on the cathode side. Both the inhibitors increase the cathode and anode polarisation considerably.DETAILED investigations have been carried out in this laboratory on the inhibition of the corrosion of aluminium and its alloys with thiourea 1-8 and nicotinic acid 1-6, 9-11 , as well as of steel with nicotinic acid 12 in hydrochloric acid solutions. A review article 13 on thiourea and its derivatives as corrosion inhibitors covers the literature up to 1967. Although pickling in nitric acid is common in the metal finishing industry, inhibitors are hardly used in this medium. The investigations on the inhibition aspect are rather meagre in literature, and this is particularly true with brass. A recent article 11 summarises the work reported in litera ture up to 1966 on the corrosion inhibition of brass in various media. This paper presents the results of studies with thiourea and nicotinic acid for the corrosion of brass in nitric acid solutions. Experiments and resultsThe brass sheet (SWG 22) was of the composition corresponding to the specification BS 265:1963-copper 61·5-64% and zincremainder, lead-0·30 (max.), other impurities 0·30 (max.)% (analysis: Cu-63·2% and Zn-36·3%). The metal coupon was punched in one piece with a steel die. It was of a circular design to minimise the edge effects (diameter 2cm with a tab) the total weight being approximately 3·8g. The tab was coated with Perspex from a chloroform solution leaving only the circular portion of apparent surface area 6·28cm 2 exposed to the corro sive medium. The sample was immersed in a beaker containing 100ml nitric acid solution.The pretreatment of the coupon was as follows: rounding off the edges, degreasing with acetone, buffing, treating with 4N nitric acid for 1min, washing with distilled water and drying. This process normally gave weight losses reproducible within ± 10%. The loss in weight was determined under the following conditions: (a) concentration of nitric acid 0·5, 1·0, and 1·5N, (b) temperature 32 ± 0·1°C, and (c) immers...

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Inhibition of the corrosion of brass in nitric acid

Padma

Char²

1969

Anti-Corrosion Methods and Materials

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Some aspects of corrosion research

Char

1969

Anti-Corrosion Methods and Materials

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The industrial expansion of the post‐war period has resulted in the development of new products and processes, specialised equipment and new materials of construction. Materials science, technology and engineering, has emerged as an independent discipline during the last decade. These changes have brought up the importance of corrosion problems and the urgency to apply preventive methods. It is probably true to say at the present time that the losses due to metallic corrosion give a fair index of the industrial prosperity of a nation. A developing country like India had to face the challenge posed by corrosion, and there is now an increasing awareness of the imperative need for corrosion research and the application of the findings to meet specific situations.

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Nicotinsäure als Inhibitor der Korrosion von Aluminium‐Magnesium‐Legierungen in salzsauren Lösungen

Cited by 2 publications

References 6 publications

Inhibition of the corrosion of brass in nitric acid

Inhibition of the corrosion of brass in nitric acid

Some aspects of corrosion research

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