ASTM D1748-2002 Standard Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet《在湿润箱中用金属保护剂防止金属生锈的标准试验方法》.pdf
《ASTM D1748-2002 Standard Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet《在湿润箱中用金属保护剂防止金属生锈的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1748-2002 Standard Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet《在湿润箱中用金属保护剂防止金属生锈的标准试验方法》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 1748 02Designation: 366/84An American National StandardStandard Test Method forRust Protection by Metal Preservatives in the HumidityCabinet1This standard is issued under the fixed designation D 1748; the number immediately following the designation indicates the year oforiginal adopt
2、ion or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.
3、Scope1.1 This test method is used for evaluating the rust-preventive properties of metal preservatives under conditionsof high humidity.1.2 The values stated in SI units are to be regarded as thestandard except where the test apparatus or consumable partsare only available in other units. In such ca
4、ses these will beregarded as standard. The values given in parentheses are forinformation only.1.3 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 consult andestablish appropriate safety and
5、 health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:A 109/A 109M Specification for Steel, Strip, Carbon, Cold-Rolled2D 512 Test Methods for Chloride Ion in Water3D 516 Test Method for Sulfate Ion in Water3E11 Specificati
6、on for Wire-Cloth Sieves for testing Pur-poses4E 323 Specification for Perforated-Plate Sieves for testingPurposes42.2 Federal Standards:5QQ-S-698 Steel Sheet and Strip, Low Carbon2.3 Military Standards:6MIL-C-5646F Cloth, AirplaneMIL-C-15074E Corrosive Preventive Compound FingerPrint Remover2.4 Soc
7、iety of Automotive Engineers:7SAE 1009C Tee Reducer, Bulkhead on Side, Flareless Tube3. Summary of Test Method3.1 Steel panels are prepared to a prescribed surface finish,dipped in the test oil, allowed to drain, and then suspended ina humidity cabinet at 48.9 6 C (120F) for a specified numberof hou
8、rs. The oil fails or passes the test in accordance with thesize and number of rust dots on the test surfaces of the panels.4. Significance and Use4.1 This test method is used for measuring the relativeabilities of metal preservatives to prevent the rusting of steelpanels under conditions of high hum
9、idity. It should not berelied upon to predict the effectiveness of a metal preservativein which high humidity is not the principal factor in the rusting.4.2 Comparisons made by this test method should normallybe limited to similar metal preservative combinations designedfor similar applications. The
10、 test life required for each type ofmetal preservative and for each intended application should bebased on actual experience with that type of preservative in theintended service.4.3 Since the precision of the test method appears to be lessthan desired, a number of repeat tests may be necessary toes
11、tablish the test life of a given metal preservative, and repeattests by this test method in more than one cabinet aresometimes desirable.4.4 The data obtained from this accelerated test is of interestonly in eliminating the most unsuitable materials or forindicating a probable relative order of prot
12、ection against rustunder conditions of high humidity. This test method does notprescribe the exposure periods to be used for a specific product,nor the interpretation to be given to the results.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and
13、is the direct responsibility of SubcommitteeD02.L0.03 on Corrosion Testing of Sheet Metal Processing Fluids.Current edition approved Nov. 10, 2002. Published February 2003. Originallyapproved in 1960. Last previous edition approved in 2000 as D 174800.2Annual Book of ASTM Standards, Vol 01.03.3Annua
14、l Book of ASTM Standards, Vol 11.01.4Annual Book of ASTM Standards, Vol 14.02.5Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402.6Available from Standardization Documents Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-5094, Attn
15、: NPODS.7Available from Society of Automotive Engineers, 400 Commonwealth Dr.,Warrendale, PA 15096.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Apparatus5.1 The apparatus shall conform to the details shown in theAnnex A1.6. Pan
16、el Cleaning Materials6.1 Aluminum Oxide Cloth, 240-grit.NOTE 1Paper-backed abrasives, wet or dry, waterproof, or iron oxideabrasives are prohibited.6.2 Silica Sand, white, dry, sharp, chloride free, or alumi-num oxide, blasting grade. (The size shall be such that it meetsthe following sieve requirem
17、ents of Specifications E11 andE 323.6.2.1 One hundred percent must pass through a No. 10(2.00-mm) sieve.6.2.2 Minimum of 90 % must pass through a No. 20(850-m) sieve.6.2.3 Maximum of 10 % permitted to pass through a No. 50(300-m) sieve.6.3 CleanersSelect a cleaning media and method, whichis safe, no
18、n-film forming and which does not in any way attackor etch the surface chemically. In addition, no Class 1 ozonedepleting substances conforming to Section 602(a) of the CleanAir Act Amendments of 1990 (42USC7671a) as identified inSection 326 of PL 102-484 should be used. Use a procedure asoutlined i
19、n Test Method F 22 to judge the merit of the selectedcleaning technique.NOTE 2A typical solvent found acceptable for this purpose is hexaneor Stoddard solvent.NOTE 3The original precision was developed using a combination ofpetroleum naphtha and methanol. These are no longer used due to toxicityissu
20、es.6.4 Gauze, lint free cotton or gauze pads.7. Humidity Cabinet Operating Conditions7.1 During evaluation of a sample the cabinet shall be runcontinuously with the following standard conditions beingmaintained:Air temperature:Inside the cabinet 48.9 6 1.1C (120 6 2.0F)Outside the cabinet 24.1 6 5.5
21、C (75.4 6 10.0F)Rate of air to the cabinet 0.878 (31.0 6 1ft3/h) at 25.0C and 7606 0.028 m3/h mm HgWater in cabinet:Level 203.0 6 6.4mm(8.0614 in.)pH 5.5 to 7.5Oil content clear with no evidence of oilChlorides less than 20 ppm (Test MethodsD 512)Sulfates and sulfitesAless than 20 ppm as sulfate (Te
22、stMethod D 516)ABoil the water sample with 10 mL of saturated bromine water before makingthe test for sulfates.Speed of rotating 0.33 6 0.03 rpmCover close fittingCloth layers in cover shall not be torn, contaminated,nor contain droplets of waterCover opening to a height of 355 mm (14 in.) atthe fro
23、nt7.2 Rate of air to the cabinet, air temperature, pH, and waterlevel shall be checked and regulated if necessary twice eachday, at 7- to 8-h intervals. Remaining standard conditions shallbe closely checked once each week. The pH measurement maybe made with wide-range indicator paper.NOTE 4Values fo
24、r pH outside the limits shown indicate contamina-tion that should be investigated and corrected. A persistent low pH alongwith a positive sulfate test indicates that the air supply is contaminatedwith sulfur oxides. In this case, the water in the cabinet should bereplaced, and a suitable alkali scru
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