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
25、bber system installed in the air train.NOTE 5Details of the cabinet operation described in 7.1 and 7.2 andthe details of panel preparation described in Section 8, must be carefullycarried out. Only by such standardization can results be obtained that aresignificant and comparable to those run at ano
26、ther time or in anotherlaboratory.8. Panel Preparation8.1 Remove the protective packaging from all the panels tobe used for a particular day and wash away the rust preventivematerial in a beaker of solvent selected in 6.3 (swabbing ispermissible using materials defined in 6.4). Carefully inspecteach
27、 panel and use only those which comply with requirementsgiven in A1.10. Identify each panel by an appropriate numberin the right-hand lower corner, outside of the significant area,or by attaching a small metal tag to the outside wire hook afterthe panel is polished.8.2 The following are pertinent to
28、 the polishing operations:8.2.1 Do not allow the bare fingers to touch the panel.Tongs, metal hooks, or pieces of lint-free paper are suitablehelpers for manipulating and holding the panel.8.2.2 Always keep the panel on a clean, dry surface.8.3 Alternative Surface FinishesPolishing:8.3.1 The amount
29、of polishing of the panel by the operatorconducting the humidity cabinet test should only be thatrequired to give it a fresh, clean, and active surface. Thisrequires only a few minutes per panel. A fast-moving beltsander should not be used since the heat of friction may changethe surface characteris
30、tics of the panel. Surface finish limits forthe panel are not defined here. There should be no appreciablechange of the finish from the 0.25 to .51 m (10 to 20 m)obtained by the original surface grinding A1.10.1.3.8.3.2 Divide the 240-grit aluminum oxide abrasive clothinto convenient size strips for
31、 the subsequent polishing opera-tions. Observing the precautions given in 8.2 and 8.3, buff allfour of the rounded edges with even strokes in the direction ofeach edge. Ream out the two holes used for suspension andwipe clean, using gauze wet with solvent selected in 6.3.8.3.3 While polishing, place
32、 the panel on a clean, drysurface with a suitable thickness of clean paper under it to helpprevent contamination. The panel may be held by hand, usingpaper between the fingers and the steel surface. Alternatively itmay be held in a special holder such as a wooden block, havingabout a 1.6-mm (116-in.
33、) depression slightly larger in area thanthe 51- by 102-mm (2- by 4-in.) dimension of the panel. Theabrasive cloth may be held in the palm of the hand with thefingers applying pressure to the panel. Alternatively, thealuminum oxide cloth may be held on a block of sizeconvenient to the hand and conve
34、nient for polishing withsmooth strokes without marking the ends of the panel.8.3.4 Polish the unnumbered or leading surface of the panelwith careful even strokes, always parallel to the 102-mmD1748022(4.0-in.) dimension. Use a polishing pressure of about 4.5 to8.9 N (1.0 to 2.0 lb). Do not scratch t
35、he surface by using shortor curved strokes. Ensure that the panel is held firmly so thatonly the abrasive cloth moves. After several polishing strokes,inspect the abrasive cloth and when necessary make anotherfold to expose a new and effective area. Continue to polish theleading surface until it con
36、tains a completely fresh surface. Thefinish should be within the range from 0.25 to 0.51 m (9.8 to20.0 in) (rms). Examine the entire surface, and if scratches orother imperfections are noted, continue polishing until cor-rected. In the same manner polish the second side of the panel,unless the test
37、specification requires only one polished side perpanel.NOTE 6It is advisable for each operator to finish several panels todetermine exactly what technique is required to attain the correct surfacefinish using a profilometer or other surface roughness gage. Aftertechniques have been established, the
38、use of visual comparison standardsis sufficient as a check on surface roughness.8.3.5 Remove the dust from the abrasive operation, usingclean gauze wet with solvent selected in 6.3. Finally, wipe withclean surgical gauze until there is no dark stain on a cleansection of the gauze. Remove any dust in
39、 the holes by use of apipe cleaner. (This may be followed by an ultrasonic cleaningbath procedure.) Submerge the panel completely in solventselected in 6.3 at room temperature.NOTE 7The following should be carried out periodically as a checkon surface cleanliness: Place the cleaned panel directly un
40、der a buret ona table free of vibrations and drafts. Place the buret so that its tip is exactly300 mm above the panel. The buret contains distilled water and shall havea tip of proper dimensions to deliver 0.05 6 0.01 mL of distilled water perdrop.Allow one drop of distilled water to fall onto the p
41、anel surface. If thesurface is absolutely clean, successive droplets on various parts of thesurface will spread out completely in spots of closely reproducibledimensions. A clean panel should give a spread of 21 to 23 mm for each0.05 mL of distilled water. This test is considered necessary and impor
42、tantbecause of variations found in different abrasive materials and thepersonal factors involved in the procedure require some method of checkon final results. Panels used for this cleanliness check test are not suitablefor use in the protection test.8.3.6 To minimize differences in activity of the
43、steel sur-faces as a result of time in various air atmospheres, cleaningand polishing of the panels should be standardized in respect totime. For this reason, carry out the procedure described in8.3.2-8.3.5 one panel at a time, and after each one is prepared,store it immediately in solvent selected
44、in 6.3 at roomtemperature until all the panels for one days operations areprepared.8.3.7 Heat the solvent selected in 6.3 so that the solvent willevaporate from the panels immediately upon withdrawal fromthe solvent.8.3.8 Remove remaining residue by holding the panels in arack at 20 from the vertica
45、l and spraying downward withsolvent selected in 6.3.8.3.9 Spray the test surface, then the back of the panel, andthe test surface again.8.3.10 Rinse the panels in hot solvent selected in 6.3, andstore in a desiccator until cool.8.3.11 Use panels the same day as prepared.8.4 Alternative Surface Finis
46、hesSand or Aluminum OxideBlasting:8.4.1 Blast the edges and lightly blast the backs of thepanels with the blasting material.8.4.2 Blast the unnumbered side, or test surface, of thepanels to a fresh, uniformly abraded surface. (Operation177.9355.8 N of the blasting equipment at 40- to 80-lbpressure a
47、nd holding the workpiece 50.8 to 76.2 mm (2 to 3 in.)from the nozzle is recommended.)8.4.3 Immediately after blasting, place the panels in abeaker of nonreactive solvent or an ultrasonic cleaning bathcontaining nonreactive solvent.8.4.4 Heat the solvent selected in 6.3 so that the solvent willevapor
48、ate from the panels immediately upon withdrawal fromthe solvent.8.4.5 Remove remaining residue by holding the panels in arack at 20 from the vertical and spraying downward withsolvent selected in 6.3.8.4.6 Spray the test surface, then the back of the panel, andthe test surface again.8.4.7 Rinse the
49、panels in hot solvent selected in 6.3, andstore in a desiccator until cool.8.4.8 Panels are to be used the same day as prepared.9. Procedure9.1 Bring the sample oil to a temperature of 23.3 6 0.5C(74.0 6 1.0F) and pour into a clean, dry 400-mL tall-formglass beaker8to a height of at least 114 mm (about 375 mL).By use of one clean suspension hook remove a panel from themethanol and hang it in the vapor space above boiling solventselected in 6.3 for 5 min, ensuring that the panel is completelywet with the refluxing solvent.NOTE 8Cleaning the panel with solve
