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Standard Test Method for Measurement of Hindered Phenolic Antioxidant Content in Non-Zinc Turbine Oils by Linear Sweep Voltammetry
Automaticky přeložený název:
Standardní zkušební metoda pro měření Hindered Phenolic obsahem antioxidantů v nezinkového turbínových olejů Linear Sweep voltametrie
NORMA vydána dne 1.5.2013
Označení normy: ASTM D6810-13
Poznámka: NEPLATNÁ
Datum vydání normy: 1.5.2013
Kód zboží: NS-36618
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
2,6-di-tert-butyl-4methylphenol, 2,6-di-tert-butylphenol, aromatic amines, hindered phenol antioxidant, in-service oils, linear sweep voltammetry, non-zinc turbine oils, turbine oil, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||||||
4.1 The quantitative determination of hindered phenol antioxidants in a new turbine oil measures the amount of this material that has been added to the oil as protection against oxidation. Beside phenols, turbine oils can be formulated with other antioxidants such as amines which can extend the oil life. In used oil, the determination measures the amount of original (phenolic) antioxidant remaining after oxidation have reduced its initial concentration. This test method is not designed or intended to detect all of the antioxidant intermediates formed during the thermal and oxidative stressing of the oils, which are recognized as having some contribution to the remaining useful life of the used or in-service oil. Nor does it measure the overall stability of an oil, which is determined by the total contribution of all species present. Before making final judgment on the remaining useful life of the used oil, which might result in the replacement of the oil reservoir, it is advised to perform additional analytical techniques (in accordance with Practices D6224 and D4378), having the capability of measuring remaining oxidative life of the used oil. 4.1.1 This test method is applicable to non-zinc turbine oils. These are refined mineral oils containing rust and oxidation inhibitors, but not antiwear additives. This test method has not yet been established with sufficient precision for antiwear oils. 4.2 This test method is also suitable for manufacturing control and specification acceptance. 4.3 When a voltammetric analysis is obtained for a turbine oil inhibited with a typical hindered phenol antioxidant, there is an increase in the current of the produced voltammogram between 3-5 s (or 0.3 to 0.6 V applied voltage) (see Note 1) in the basic test solution (Fig. 1—x-axis 1 second = 0.1 V). Hindered phenol antioxidants detected by voltammetric analysis include, but are not limited to, 2,6-di-tert-butyl-4-methylphenol; 2,6-di-tert-butylphenol and 4,4'-methylenebis(2,6-di-tert-butylphenol). 4.4 For non-zinc turbine oils
containing aromatic (aryl) amine compounds (antioxidants and
corrosion inhibitors), there is an increase in the current of the
produced voltammogram between 7-11 s (0.7 to 1.1 V applied voltage
in 1.1 This test method covers the
voltammetric determination of hindered phenol antioxidants in new
or in-service non-zinc turbine oils in concentrations from 0.0075
weight % up to concentrations found in new oils by measuring the
amount of current flow at a specified voltage in the produced
voltammogram.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||
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