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  • 1
    Electronic Resource
    Electronic Resource
    The effect of dibenzylsulfoxide and sodium phosphate on the stress corrosion cracking of steels (1998)
    Bradford : Emerald
    Anti-corrosion 45 (1998), S. 38-40 
    Details
    ISSN: 0003-5599
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This article aims to study the inhibition of Stress Corrosion Cracking (SCC) of steels (22K and OCH18N10T) in citric acid and sodium chloride. The effect of the investigated inhibitors; dibenzylsulfoxide (DBSO) and sodium phosphate (Na3PO4) was established by means of slow strain rate technique (SSRT). It was observed that DBSO positively influences the susceptibility of given steels to SCC. It was found that sodium phosphate inhibits the SCC of 22K, but increases the susceptibility of OCH18N10T steel to SCC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00035599810194178
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchung von Korrosionsinhibitoren für Eisen in Fluorwasserstoffsäure (1974)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 25 (1974), S. 750-753 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigation into corrosion inhibitors for iron in hydrofluoric acidA study (gravimetrically, measurement of the polarization resistance, tracing of potentiodynamic polarization curves) of the inhibition of the corrosion of iron in hydrofluoric acid has revealed that dibenzyl sulfoxide and lauryl pyridinium isooctyl xanthogenate (with thiourea) are efficient corrosion inhibitors. Thiourea, pyridinium xanthogenate and urotropine as well as diphenyl thiocarbazide and diphenyl guanidine exhibit good inhibiting properties. The effect can be interpreted generally in terms of the availability of free electron pairs.
    Notes: Bei einer Untersuchung (gravimetrisch, Polarisationswiderstandsmessung, Aufnahme potentiodynamischer Polarisationskurven) der Inhibierung der Korrosion von Eisen in Flußsäure erwiesen sich Dibenzylsulfoxid und Laurylpyridinium-isooctyl-xanthogenat mit Thioharnstoff als wirksame Korrosionsinhibitoren. Auch Thioharnstoff, Pyridinium-xanthogenat und Urotropin sowie Diphenylthiocarbazid und Diphenylguanidin zeigten gute Hemmwirkung. Die Wirksamkeit läßt sich allgemein durch das Vorhandensein freier Elektronenpaare erklären.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19740251010
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quantenchemische Bewertung von Nitron als Inhibitor der Korrosion (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 487-489 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Quantum chemical evaluation of Nitron as a corrosion inhibitorEliminating as much as possible the physical factors which might have a bearing, the efficiency of Nitron (having meso-ionic structure) as an inhibitor of the corrosion of Fe 99.999 in 5% HCl has been investigated and evaluated in terms of quantum chemistry. According to this evaluation the inhibiting efficiency increases with the energy of the HOMO because the ionisation potential is then reduced and the molecule can more easily act as an electron donator. Certain positions in the Nitron molecule which are characterized by increased electron density are thus in a position with their own electrons to participate in the bond formation between inhibitor and metal.
    Notes: Unter Ausschaltung möglichst vieler physikalischer Einflußgrößen wurde die Wirkung von Nitron (mesoionische Struktur) als Inhibitor der Korrosion von Fe99,999 in 5% iger HCl untesucht und quantenchemisch ausgewertet. Danach steigt die inhibierende Wirkung mit der Energie des HOMO, da dann das Ionisierungspotential verringert ist und das Molekül leichter als Elektronendonator wirken Kann. Bestimmte Stellen im Nitron-Molekül, die sich durch erhöhte Elektronendichte auszeichnen, werden auf diese Weise in die Lage versetzt, sich mit eigenen Elektronen an der Bindung zwischen Inhibitor und Metall zu beteiligen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19720230607
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibierung von nichtstabilisiertem Stahl 18Cr8Ni in Kühlwasser bei 50°C (1977)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 28 (1977), S. 85-87 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Inhibition of unstabilised steel 18 Cr8Ni in cooling water at 50°CUsing the pitting potential determination from the anodic branch of the potentio-dynamic polarisation curves the authors have searched for the most suitable inhibitor and its most appropriate concentration for cooling water system made of unstabilised steel German Werkstoff-Nr. 1.4301. They have found that the conventional inhibitors (the effect of which is based on oxidation and on promotion of passivation) require, in the given medium, high concentrations which cannot be used on an industrial scale, in particular in the case of open recirculation systems with high sludge levels. The system most suitable for the intended purpose was a mixture of sodium sulfate and hexametaphosphate (sulfate: chloride ratio = 3). Because of its synergistic effect this mixture considerably reduces the pitting danger. The hexametaphosphate - because of its ability to bind calcium - yields a removable sludge and at the same time prevents incrustation.
    Notes: Mittels der Methode der Bestimmung der Lochfrßpotentiale aus den anodischen Zweigen potentiodynamischer Polarisationskurven wurde der günstigste Inhibitor und seine günstigste Konzentration für Kühlkreisläufe, die aus nichtstabilisiertem Stahl DIN 4301 konstruiert sind, gesucht. Es wurde festgestellt, daß die üblichen Oxidations- und Passivierungsinhibitoren im gegebenen Medium nur in Konzentrationen wirksam sind, die besonders im Falle offener Kreisläufe mit hohen Abschlammanteilen, im großtechnischen Maßstab angewendet werden können. Am vorteilhaftesten zeigte sich das Gemisch von Natriumsulfat und Natriumhexamethaphosphat (beim Verhältnis SO42-: Cl- = 3). Dieses Gemisch setzt dank der synergischen Wirkung beträchtlich die Möglichkeit des Auftretens von Lochkorrosion herab. Die Zugabe von hexamethaphosphat verhindert durch das Binden des Kalziums unter Bildung von beweglichem Schlamm auch die Inkrustierung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19770280204
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    Paper (German National Licenses)
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