IRON CHIP CORROSION FOR WATER DILUTABLE METAL WORKING FLUIDS: ASTM D4627
EXPLANATION
This test method evaluates the ferrous corrosion control characteristics of water-dilutable metalworking fluids. The results obtained by this test method are a useful guideline in determining the ability of water-diluted metalworking fluids to prevent or minimize rust under specific conditions. There is usually a relationship between the results of this test and a similar ability of the subject coolant to prevent rust on nested parts or in drilled holes containing chips, etc. However, the conditions, metal types, etc., found in practice will not correlate quantitatively with these controlled laboratory conditions. The procedure may not be able to differentiate between two products with poor rust control due to the wide spacing between test dilutions.
TEST SUMMARY
Cast iron chips are placed in a petri dish containing a filter paper and diluted metalworking fluid. The dish is covered and allowed to stand overnight. The amount of rust stain on the filter paper is an indication of the corrosion control provided by the fluid.
TEST PRECISION
Repeatability: 0.64
Reproducibility: 1.85
These data are for sample Nos. 1, 3, 4, and 5.
This test method has no bias because the corrosion value can be defined only in terms of this test method.
