1、 FORD LABORATORY TEST METHOD EU-BT 002-01 Date Action Revisions 2000 11 10 Revised Editorial no technical change A. Cockman 1994 02 28 Printed copies are uncontrolled Page 1 of 5 Copyright 2000, Ford Global Technologies, Inc . DETERMINATION OF CORROSIVITY OF SOLUBLE OIL EMULSIONS Application This me
2、thod is used to determine and compare the corrosion inhibiting characteristics of soluble oil emulsions. Two methods are described as follows: a) Determination of Break Point. b) Checking Break Point against Specification. Apparatus and Chemical Required Filter Papers 9 cm diameter Whatman No. 40 or
3、 equivalent. Petri Dish 9 - 10 cm diameter with lid. Pipettes 2 mL capacity. Measuring Cylinder 100 mL capacity - stoppered. Sieve 16 mesh - to BS 410:1969 (DIN 4188 - 1 Nr. St.). Guide 35 mm - (perspex) for masking test area. Synthetic Water Water with a total hardness of 3.58 mmol CaC1 2 .6H 2 0 a
4、nd MgSO 4 .7H 2 0 per litre being prepared from: 17 mL of solution A 3 mL of solution B 980 mL of boiled and cooled down, distilled, chemical pure water*. *Water prepared by means of ion exchange is only permitted when the evaporation residue is below 2 mg/1. FORD LABORATORY TEST METHOD EU-BT 002-01
5、 Page 2 of 5 Copyright 2000, Ford Global Technologies, Inc. Solution A: 39 g calcium chloride (CaC1 2 .6H 2 0), A.R., dissolved with distille d water to 1 litre. 1 mL of this solution A diluted with distilled water and 1 litre results in water of a hardness of 0.179 mmol CaC1 2 .6H 2 0 per litre. So
6、lution B: 44 g magnesium sulphate (MgSO 4 .7H 2 0), A.R., dissolved with distilled water to 1 litre. 1 mL of this solution B diluted with distilled water to 1 litre results in water of a hardness of 0.179 mmol MgSO 4 .7H 2 0 per litre. Transparent Grid 35 x 35 mm - divided into 100 squares of 3.5 mm
7、 length of side. Spoon-spatula Acetone A.R. Cast Iron Drillings (Chips) dimensions: Approximately 5 x 5 mm prepared in accordance with the requirements of the Institute of Petroleum. Source: PERA Melton Mowbray Leicestershire LE13 OPB Preparation of the Test Chips and the Water Soluble Coolant a. Ca
8、st Iron Chips The chips are to be inspected visually prior to use with regard to freedom of any corrosion and then be sieved. They never should be touched with a bare hand. b. Soluble Oil Using the 2 mL pipette, transfer the required volume of the soluble oi l sample to the measuring cylinder contai
9、ning the required amount of the freshly prepared synthetic water. Replace stopper immediately and shake vigorously until dispersion is complete. Each mixture is to be tested twice; for each individual mixture (con centration) a freshly prepared dispersion is to be made. Conditioning and Test Conditi
10、ons The tests must be performed in a temperature controlled room at 20 +/ - 2 C free from corrosive fumes and direct sunlight. FORD LABORATORY TEST METHOD EU-BT 002-01 Page 3 of 5 Copyright 2000, Ford Global Technologies, Inc. Procedure Method A - Determination of Break Point 1. Weigh out 2 +/ - 0.1
11、 g of the cast iron sample. 2. Place a filter paper in the petri dish. Position the perspex guide centrally on the filter paper. Spread the cast iron chips evenly on the filter paper inside the guide ensuring that the full area is utilised. Lightly tap the side of the guide to ensure chips settle on
12、to the filter paper. 3. Using the pipette, transfer 2.0 mL of the emulsion onto the cast iron chips so that they are all thoroughly wetted. 4. Cover the petri dish with t he lid and leave for 120 +/ - 2 minutes. 5. Remove the filter paper from the dish and wash with demineralised water. Blot, then w
13、ash with the acetone and dry. 6. Evaluation - Immediately following the drying of the filter paper the degree of corrosion is determined using the transparent 35/35 grid (see table). The picture shown may be helpful in evaluating the degree of corrosion. Corrosion Grade Significance Characterization
14、 (surface of filter) 0 No Corrosion Unchanged 1 Light Corrosion No t more than 1% of the surface stained 2 Moderate Corrosion Above 1% but not more than 5% of the surface stained. 3 Strong Corrosion Above 5% of the surface stained 7. Conclusion The test result should indicate: . Type of supply and b
15、rand of the tested water soluble oil. . Mixture ratio of soluble oil and water in % by vol. . The corrosion grade. FORD LABORATORY TEST METHOD EU-BT 002-01 Page 4 of 5 Copyright 2000, Ford Global Technologies, Inc. Method B - Determination of Corrosion Break Point Purpose of Checking If in an approp
16、riate Manufacturing Standard requirements with regard t o corrosion protection are layed down as “rate and report“ it may be useful to employ the determination of the corrosion break point. Concept The corrosion break point of a coolant is defined as such a concentration of the coolant at which the
17、corrosion G rade 1 or better is attained. Procedure In accordance with Preparation of Water Soluble Coolant Para b a number of emulsions are prepared with concentration intervals of 0.15 %. For the starting point concentration an emulsion is to be selected complying with the lowest possible concentr
18、ation in practical application. The prepared emulsions are checked and evaluated similarly to Method A, Item 1 - 6. Evaluation Corrosion Grade 1 or less is considered acceptable and this result must be identified as the Corrosion Break Point at a specific concentration. Chemicals, materials, parts,
19、and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD EU-BT 002-01 Page 5 of 5 Copyright 2000, Ford Global Technologies, Inc. DETERMINATION OF CORROSIVITY OF SOLUBLE OIL EMULSIONS
