ASTM D5968 Test Method for Evaluation of Corrosiveness of Diesel Engine Oil
5. Apparatus
5.1 The main apparatus consists of the following items of standard wall borosilicate glassware as shown in Figs. 1-6.
5.1.1 Main Sample Tube, Fig. 1.
5.1.2 Sample Tube Head, Fig. 2.
5.1.3 Air Tube, Fig. 3.
5.1.4 Thermocouple Tube, Fig. 4.
5.1.5 Condenser, Allihn Type, Fig. 5.
5.1.6 Assembled Apparatus, Fig. 6.
5.2 Additional glassware items and assembly accessories needed are:
5.2.1 Spacers (for metal specimen), of borosilicate glass, standard wall, 9-mm outside diameter, 6-mm length.
5.2.2 Oil Sampling Tube, Borosilicate Glass, 4-mm outside diameter, with sampling end approximately 600 mm to reach into main sample tube. Tube is bent U-shape with exit end fitted by a one-hole stopper to a 25-mL filtering flask. Exit end may be any convenient length.
5.2.3 Adapter, Polytetrafluoroethylene for 10/18 joint for sealing of air tube to sample tube head.
5.3 Other items and equipment are:
5.3.1 Heating Bath, constant temperature control within +/- 0.5°C (+/-1°F) of test temperature with an immersion depth of 250 +/- 20 mm. Oil or aluminum baths are recommended. (Warning - There are exposed hot surfaces on apparatus. Avoid skin contact by use of protective equipment.)
5.3.2 Hood Ventilation, to adequately remove fumes during heating.
5.3.3 Air Supply, dry air, with a dew point of -68°C (-90°F) maximum and free of reactive contaminants.
5.3.4 Flowmeter, capable of measuring 10 +/- 1 L/h.
5.3.5 Balance, analytical sensitivity 0.1 mg.
5.3.6 Balance, Laboratory, 2500-g capacity, 0.1-g sensitivity.
5.3.7 Microscope, with 20-diameter magnification.
5.3.8 Assembly Fixture, wood slotted to hold coupons squares (assembly as shown in Fig. 7) for tying with wire.
5.3.9 When air needs to be conditioned there is a need for an air drier. The method used is optional provided the air characteristics of 5.3.3 are attained. For drying, a satisfactory method is the use of a glass column containing 8-mesh anhydrous calcium sulfate with a column diameter such that velocity of air does not exceed 1.2 m/min.
5.3.10 Oven, optional, to dry glassware at elevated temperature.
5.3.11 Forceps, stainless steel.
5.3.12 Thermocouple.
5.3.13 Brush, short-bristled, stiff (old-style typewriter cleaning brush or equivalent).
6. Reagents and Materials
6.1 Purity of Reagents - Use reagent grade chemicals in all tests. Unless otherwise indicated it is intended that all reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such specifications are available.
6.2 Metal Specimens:
6.2.1 Coupons, 0.081 cm thick by 2.5 cm square, one each, with two drilled holes (as shown in Fig. 7), as follows:
6.2.1.1 Copper (R401-A),
6.2.1.2 Lead (R401-lead),
6.2.1.3 Tin (R401-tin), and
6.2.1.4 Phosphor Bronze (R401-LEADz).
6.3 Nichrome Wire, clean (for tying coupons together).
6.4 Abrasive Paper, silicon-carbide, 240 and 400 grits. Do not use wet-or-dry, waterproof, or iron containing abrasives such as natural emery.
6.5 Cotton, absorbent.
6.6 Acetone (ACS), sulfur-free. (Warning - Flammable. Health hazard.
6.7 Degreasing Solvents, Trichlorotrifluorethane or 1,1,1-trichloroethane. (Warning - Harmful if inhaled.)
6.8 Glassware Cleaning Solution, mix 35 mL of saturated sodium dichromate (aqueous) solution and 1000 mL of concentrated sulfuric acid. (Warning - Causes severe burns.)
6.9 Carbon Remover for Glassware, Oakite Stripper R-8. (Warning - Corrosive, causes severe burns.)
6.10 Tetrahydrofuran. (Warning - Toxic and flammable. Health hazard.)
6.11 Naphtha, Aromatic. (Warning - Flammable. Health hazard.)
6.12 Filter Paper.
6.13 Kimwipe Tissues, or similar.
6.14 Industrial Reference Oil.
