1、Designation:D462712Standard Test Method forIron Chip Corrosion for WaterMiscible MetalworkingFluids1This standard is issued under the fixed designation D4627;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers evaluation of the ferrous cor-rosion control characteristics of watermiscible metalworkingfluids.1.2 The values s
3、tated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionNote 1 contains inch-pound units sincethe drill sizes and feed rates do not have readily availablemetric equivalents.1.2.2 ExceptionU.S.Standard sieve sizes include meshvalues.1.
4、3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Terminology2.1 Def
5、initions:2.1.1 rust,ncorrosion product consisting primarily ofhydrated iron oxides.2.2 Definitions of Terms Specific to This Standard:2.2.1 breakpoint,nweakest concentration of the water-miscible metalworking fluid tested that leaves no rust stain onthe filter paper.3.Summary of Test Method3.1 Cast
6、iron chips are placed in a petri dish containing afilter paper and diluted metalworking fluid.The dish is coveredand allowed to stand overnight.The amount of rust stain on thefilter paper is an indication of the corrosion control provided bythe fluid.4.Significance and Use4.1 The results obtained by
7、 this test are a useful guideline indetermining the ability of water-miscible metalworking fluidsto prevent or minimize rust under specific conditions.There isusually a relationship between the results of this test and asimilar ability of the subject coolant to prevent rust on nestedparts or in dril
8、led holes containing chips,etc.It must beunderstood,however,that conditions,metal types,etc.found inpractice will not correlate quantitatively with these controlledlaboratory conditions.The procedure may not be able todifferentiate between two products with poor rust control dueto the wide spacing b
9、etween test dilutions.5.Apparatus5.1 Disposable Petri Dishes,35 by 10 mm plastic,with lids.5.2 Glass-Fiber Filter Paper,1.5 m particle retentionrating,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 Cylind
10、er,50 mL.5.9 Volumetric Flask,1 L.5.10 Forceps.5.11 U.S.StandardSieve,18-mesh(1.0-mmsieveopenings),stainless steel.6.Reagents and Materials6.1 Gray Cast Iron Drilling Chips.2NOTE1The chips are made from Class 30 gray cast iron(UNSF10006),as cast.The structure is mostly pearlite with small amounts of
11、ferrite and type A graphite.Brinell hardness is 179217.The chips aremade using a clean,oil free jobbers length high speed drill of 29/64 in.diameter with 118 plain point,29 helix and 1215 clearance.Rotationalspeed should be 500 rpm at a feed rate of 0.015 in./rev.Hand feeding is1This test method is
12、under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.01 on Metal Removal Fluids and Lubricants.Current edition approved June 1,2012.Published October 2012.Originallyapproved in 1986.Last previous edition
13、approved in 2007 as D462792(2007).DOI:10.1520/D4627-12.2Iron chips produced and packaged according to the directions given in Note 1are commercially available.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshoho
14、cken,PA 19428-2959.United States1 not permissible.The chips are sieved on 5 and 18-mesh sieves and thoseretained on the 18-mesh sieve are immediately stored in airtight pint glassbottles.Each drilling is given a batch number.The bottle labels bear thisbatch number and the date of filling.6.2 Synthet
15、ic Hard Water,20,000 mg/L stock solution pre-pared by dissolving 29.4 g reagent grade(ACS standard)CaCl22H2O in 1 Lof freshly boiled distilled water.Amoderatehardness water is necessary in this test(100 ppm as CaCO3,71mg/L as chloride),and can be prepared at the time of the testby diluting the stock
16、 hard water 0.5%in distilled water.6.3 Metalworking Fluid of Interest.7.Preparation of Diluted Metalworking Fluid7.1 Prepare 50 mL of fluid at each desired concentration byweight%in the 100 mg/Lhardness water described above.Thewater must be at room temperature as described in 8.1.Alwaysadd 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 emulsionssubsequently di
