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Overview of oxidation laboratory tests on industrial lubricants part 2


Vincent Bouillon BFB – IESPM GROUP; Les Isnes (Gembloux) - BELGIUM TURBINE OILS


FTM 791A – 3462 Panel Coker Test The Panel Coker Test is a method for determining the relative stability of lubricants in contact with hot metal surfaces. The test apparatus consists of a rectangular stainless steel reservoir, inclined 25° from horizontal. The test panel (95 mm by 45 mm) is held in place by a heating element, which is fitted with thermocouple probes to control the temperature of the aluminium or steel test panel. A horizontal shaft, fitted with a series of tines, is positioned above the oil and is rotated at 1000 rpm. During rotation of the shaft, the tines sweep through the test lubricant and lubricant droplets are thrown onto the heated test panel.


The test panel is reweighed and the amount of deposit is determined. Weight gain of test panel and the amount of test lubricant consumed during the test are an indication of the lubricant’s performance under high temperature conditions.


Many other test methods are dedicated to the evaluation of oxidation stability performance of gas and steam turbine oils as ASTM D 5846, D 6514, “as illustrated by the following examples.


AICRAFT TURBINE ENGINE OILS The aviation environment offers tough conditions for the lubricants such as high temperatures, low pressure, very low temperatures, high load, etc. Therefore, special products are required for these applications. Synthetic oils are usually preferred for severe application. The test method ASTM D4636 is used to give the resistance to oxidation and corrosion tendencies of hydraulic oils, aircraft turbine engine lubricants, and other highly refined oils used in military aircraft and equipment.


ASTM D 4636: Standard Test Method for Corrosiveness and Oxidation Stability of Hydraulic Oils, Aircraft Turbine Engine Lubricants and Other Highly Refined Oils. This method is the result of combining Federal test methods 5307.2 and 5308.7.


The test method can be used to evaluate mineral oils as well as synthetic fluids. It can be run using dry or moist air, as well as with or without the metal test specimens. There are two basic versions of this test method. Procedure 1 uses “washer” type metal specimens, which include titanium, magnesium, steel, bronze, silver, and aluminium.


Procedure 2 uses “square-shaped” metal specimens, which include copper, steel, aluminium, magnesium, and cadmium. The test is conducted in the following manner: The specified amount of test oil, 100 mL or 200 mL, is placed into a large test tube along with the polished and weighed test specimens. The assembled apparatus is weighed and placed into the constant temperature bath. Test temperature can range from 100°C to 360°C, for a specified amount of time. At the end of the test period the tube assembly is removed from the


Continued on page 18


16


LUBE MAGAZINE NO.141 OCTOBER 2017


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