ASTM D4627 Test Method for Iron Chip Corrosion for Water-Miscible Metalworking Fluids
5. Apparatus
5.1 Disposable Petri Dishes, 35 mm by 10 mm plastic, with lids.
5.2 Glass-Fiber Filter Paper, 1.5 µm particle retention rating, 3.2 cm diameter.
5.3 Glass Stirring Rod.
5.4 Spatula.
5.5 Pipettes, 5 mL.
5.6 Glass Bottle, 4 oz with cap.
5.7 Balance, accurate to 1 mg.
5.8 Graduated Cylinder, 50 mL.
5.9 Volumetric Flask, 1 L.
5.10 Forceps.
5.11 U.S. StandardSieve, 18 mesh (1.0 mm sieve openings), stainless steel.
6. Reagents and Materials
6.1 Gray Cast Iron Drilling Chips.
NOTE 1 - The chips are made from Class 30 gray cast iron (UNS F10006), as cast. The structure is mostly pearlite with small amounts of ferrite and type A graphite. Brinell hardness is 179-217. The chips are made using a clean, oil free jobbers length high speed drill of 29/64 in. diameter with 118° plain point, 29° helix and 12 - 15° clearance. Rotational speed should be 500 rpm at a feed rate of 0.015 in./rev. Hand feeding is not permissible. The chips are sieved on 5 mesh and 18 mesh sieves and those retained on the 18 mesh sieve are immediately stored in airtight pint glass bottles. Each drilling is given a batch number. The bottle labels bear this batch number and the date of filling.
6.2 Synthetic Hard Water, 20 000 mg/L stock solution prepared by dissolving 29.4 g reagent grade (ACS standard) CaCl2·2H2O in 1 L of freshly boiled distilled water. Amoderate hardness water is necessary in this test (100 ppm as CaCO3, 71 mg/L as chloride), and can be prepared at the time of the test by diluting the stock hard water 0.5 % in distilled water.
6.3 Metalworking Fluid of Interest.
7. Preparation of Diluted Metalworking Fluid
7.1 Prepare 50 mL of fluid at each desired concentration by weight % in the 100 mg/L hardness water described above. The water must be at room temperature as described in 8.1. Always add the metalworking fluid concentrates into the water.
7.2 The dilutions tested will be in weight % as follows: 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 7 and 10 %
Each dilution must be separately prepared. Stock emulsions subsequently diluted must not be used.
7.3 Cap the bottle (5.6) and shake vigorously until dispersion is complete.
