ASTM D2809 Standard Test Method for Cavitation Corrosion and Erosion-Corrosion Characteristics of Aluminum Pumps With Engine Coolants
5. Apparatus
5.1 Pump Test Stand - Detailed drawings are available. The copper, brass, and bronze flow circuit is illustrated in Fig. 1. The apparatus should be assembled upon a suitable platform or structure, with provisions for mounting controls and gages.
5.2 Warning - The entire stand should be screened or housed to protect personnel from hazardous scalding coolant in case of rupture in the pump, hose, or tubing. All belts and pulleys should be properly shielded.
5.3 Test Pump - Standard aluminum automotive water pump and engine front cover assemblies shall be used. The same make and model must be used throughout a series of tests when tests are conducted to evaluate coolants.
NOTE 3 - If it is desired to evaluate pumps on this test apparatus, a coolant of a known level of cavitation corrosion and erosion-corrosion protection should be used.
6. Test Solution
6.1 The test coolant is prepared by adding one part engine coolant concentrate to five parts corrosive water by volume. The water shall contain 100 ppm each of sulfate, chloride, and bicarbonate ions, added as sodium salts.
NOTE 4 - The specified corrosive water can be prepared by dissolving the following amounts of reagent grade anhydrous sodium salts in a quantity of distilled or deionized water:
sodium sulfate: 148 mg
sodium chloride: 165 mg
sodium bicarbonate: 138 mg
The resulting solution should be made up to a volume of 1 L with distilled or deionized water at 20 °C.
If relatively large amounts of corrosive water are needed for testing, a concentrate may be prepared by dissolving ten times the above amounts of the three chemicals, in distilled or deionized water, and adjusting the total volume to 1 L by further additions of distilled or deionized water. When needed, the corrosion water concentrate is diluted to the ratio of one part by volume of concentrate to nine parts of distilled or deionized water.
7. Sampling
7.1 The coolant concentration shall be sampled in accordance with Practice D1176.
