1、Designation: D7055 14Standard Practice forPreparation (by Abrasive Blast Cleaning) of Hot-RolledCarbon Steel Panels for Testing of Coatings1This standard is issued under the fixed designation D7055; the number immediately following the designation indicates the year oforiginal adoption or, in the ca
2、se of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the procedures to be followed in thepreparation (by abrasive blast cl
3、eaning) of hot rolled steelpanels for laboratory testing of coatings.1.2 This standard practice does not include procedures forthe application of coatings.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units
4、that are provided for information onlyand are not considered standard.1.4 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
5、 applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A36/A36M Specification for Carbon Structural SteelA572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA1011/A1011M Specification for Steel, Sheet and Strip,Hot-Rolled,
6、 Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with ImprovedFormability, and Ultra-High StrengthD4285 Test Method for Indicating Oil or Water in Com-pressed AirD4417 Test Methods for Field Measurement of SurfaceProfile of Blast Cleaned SteelD4940 Test Method for Conductimetric
7、 Analysis of WaterSoluble Ionic Contamination of Blasting AbrasivesD7393 Practice for Indicating Oil in Abrasives2.2 ISO Standard:ISO 8502-3, Part 3 Assessment of Dust on Steel SurfacesPrepared for Painting (pressure-sensitive tape method)32.3 SSPC/NACE Standards:4AB-1 Mineral and Slag AbrasivesAB-2
8、 Specification for Cleanliness of Recycled FerrousMetallic AbrasivesAB-3 Newly Manufactured or Re-Manufactured Steel Abra-sivesSP 1 Solvent CleaningSP 5/NACE No. 1 White Metal Blast CleaningSP 6/NACE No. 3 Commercial Blast CleaningSP 10/NACE No. 2 Near-White Metal Blast CleaningSSPC-VIS 1 Guide and
9、Reference Photographs for SteelSurfaces Prepared by Dry Abrasive Blast Cleaning3. Summary of Practice3.1 This practice enables the user to specify the level ofpreparation of hot-rolled carbon steel test panels (prepared bydry abrasive blast cleaning) for testing of coatings, includingthe steel compo
10、sition, the degree of surface cleanliness, and thetype of abrasive.4. Significance and Use4.1 The procedures described in this practice are designed toprovide hot-rolled, carbon steel panels with uniform andreproducible abrasive blast cleaned surfaces for testing ofcoatings.5. Test Panels5.1 Prepare
11、 the test panels from unpainted hot-rolled steelplate or bar stock.5.2 The panels shall be made to a size and thickness asagreed upon between the purchaser and seller.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the d
12、irect responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Dec. 1, 2014. Published January 2015. Originallyapproved in 2004. Last previous edition approved in 2009 as D7055 09. DOI:10.1520/D7055-14.2For referenced ASTM standards, visit the ASTM website, www
13、.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.an
14、si.org.4Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,Pittsburgh, PA 15222-4656, http:/www.sspc.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.3 The steel composition shall be either Specificatio
15、nsA36/A36M, A572/A572M, A1011/A1011M or as agreed uponbetween the purchaser and seller.55.4 The surface condition of the steel prior to surfacepreparation shall be specified and shall be one of two rustgrades based on SSPC-VIS 1: Grade A, intact mill scale; orGrade B, rusting mill scale. If SSPC-SP
16、6/NACE No. 3 isspecified in 6.2, then the surface condition shall be Grade B.5.5 Remove any burr from saw-cut or sheared edges of thetest panels.5.6 Break sharp corners and/or edges using a grindingwheel.6. Methods of Preparation6.1 DegreasingPrior to abrasive blast cleaning degreasethe panels surfa
17、ces using one of the methods listed below fromSSPC-SP1.6.1.1 Solvent CleaningImmerse the panel in a cleaningsolution or rub the surface with a clean lint-free cloth wettedwith an appropriate solvent. If excessive oil or grease ispresent, power brush the surface vigorously and re-rinse orwipe.6.1.2 A
18、lkaline or Detergent CleaningAqueous alkalinecleaners are available from a number of sources as proprietarycompounds or processes. Clean the panels with an alkalinesolution or cleaner applied by spray or immersion. Brush orwipe in accordance with the recommendations of the cleanermanufacturer. One o
19、r more steps of rinsing with water isrequired after this cleaning procedure. To prevent rustformation, force dry the panel surfaces immediately afterrinsing.6.2 Select the Degree of Abrasive Blast CleaningSpecifyone of the following degrees of cleaning as defined below.6.2.1 SSPC-SP 5/NACE No. 1Whit
20、e Metal Blast Clean-ing.6.2.2 SSPC-SP 6/NACE No. 3Commercial Blast Clean-ing.6.2.3 SSPC-SP 10/NACE No. 2Near-White Metal BlastCleaning.6.2.4 Default Degree of CleaningIf no degree of cleaningis specified, solvent clean the panels as described in 6.1.1, thenabrasive blast clean the panels to “White M
21、etal Blast Cleaning”as described in 6.2.1.6.3 Select the Surface Profile (anchor pattern) DepthSelect a surface profile range of fine, medium or coarse asdefined below, or specify an alternative range.6.3.1 Fine: 1.0 to 2.5 mils (25-63 m).6.3.2 Medium: 1.5 to 3.5 mils (38-89 m).6.3.3 Coarse: 3.0 to
22、5.0 mils (75-125 m).6.3.4 Alternative Range: The range between the minimumand maximum shall be at least 1.0 mil (25 m).6.3.5 Default Surface Profile Range: If no surface profilerange is specified, the range shall be Medium.6.4 Select the Abrasive TypeSelect the abrasive type asdefined below, or spec
23、ify an alternative abrasive. The abrasivesize shall be determined by the surface profile range selected in6.3. The actual size(s) used shall be reported. Mineral and slagabrasives shall meet the requirements of SSPC-AB-1; Steelabrasives shall meet the requirements of SSPC-AB-2 (ifrecycled) and SSPC-
24、AB-3. Test all abrasives prior to use for oilcontamination in accordance with Practice D7393 and forconductivity in accordance with Test Method D4940. Thecleanliness of the abrasive used shall conform to the require-ments of the SSPC Abrasive Standards.6.4.1 Steel Grit (angular).6.4.2 Coal Slag (ang
25、ular).6.4.3 Garnet (angular).6.4.4 Silica Sand (angular).6.4.5 Aluminum Oxide (angular).6.4.6 Steel Shot (rounded).6.4.7 Blend of approximately 60 % steel shot and 40 % steelgrit.6.4.8 DefaultAbrasive Type: If no abrasive type is specified,the abrasive used shall be steel grit.6.5 Verify the cleanli
26、ness of the compressed air (absence ofoil and water) used to pressurize the system and to propel theabrasive through the blast hose and nozzle in accordance withTest Method D4285.6.6 Abrasive Blast Cleaning OperationBlast clean thepanels using an interior-located blast cabinet or a blast room.Mainta
27、in sufficient blast nozzle air pressure to achieve theanchor profile selected in 6.3. Measure the actual blast nozzleair pressure using a hypodermic needle pressure gage. Theblast system shall be equipped with compressed air moistureand oil extractors. Air dryers or coolers can be used in lieu ofmoi
28、sture traps. Maintain the blast nozzle angle (to the panelsurface) at approximately 75 to 80, and position the blastnozzle 6 to 12 in. from the panel surface. Perform abrasiveblast cleaning using an overlapping abrasive pattern to preventstreaking and to generate a uniform appearance. Immediatelyaft
29、er abrasive blast cleaning is performed, remove residualsurface dust by blow down or vacuuming. If blow down isselected, verify the cleanliness of the compressed air inaccordance with Test Method D4285. Do not handle the testpanels with unprotected hands. Handle all test panels by theedges using lin
30、t-free gloves.6.7 Verification of Surface Cleanliness and Surface ProfileDepth:6.7.1 Surface CleanlinessEvaluate the prepared panel sur-faces for conformity to the specified degree of cleaning usingphotograph A SP10, A SP5, B SP6, B SP10, or B SP5 inSSPC-VIS 1 (based on the surface condition in and
31、the level ofsurface cleanliness). Re-blast surfaces that do not conform tothe specified degree of cleaning. Remove all visible blastcleaning abrasive and/or dust from the panel surfaces (see Note1).6.7.2 Surface Profile DepthEvaluate the prepared panelsurfaces for conformity to the specified surface
32、 profile depthusing a depth micrometer (Method B) or replica tape (MethodC) of Test Methods D4417. If Method C is used, acquire a5A36/A36M specification steel is typically not available in thicknesses less than316 in.D7055 142minimum of two readings on the first panel (averaged to createa single mea
33、surement) and one additional measurement set ofreadings on each 10th panel prepared in the same batch. IfMethod B is used, acquire a minimum of ten readings on thefirst panel (report the maximum measurement) and one addi-tional set of readings on each 10th panel prepared in the samebatch. More frequ
34、ent/additional readings/measurements can beobtained, as agreed upon between the purchaser and seller. Ifany surface profile depth measurement is outside of the rangedesignated in 6.3, the panel shall not be used.NOTE 1Upon agreement between purchaser and seller, ISO 8502-3,Part 3: Assessment of Dust
35、 on Steel Surfaces Prepared for Painting(pressure-sensitive tape method) can be employed to test preparedsurfaces for the presence of dust. An acceptable Dust Rating must beestablished prior to testing.7. Protection after Surface Preparation7.1 Wrap prepared test panels in a paper impregnated withdi
36、cyclohexylammonium nitrite, or an equivalent volatile cor-rosion inhibitor (VCI), and then seal in plastic to preventrusting of the prepared surfaces for panels that are not to beused immediately after preparation. Alternatively, preparedpanels may be stored in an oven maintained at approximately38C
37、 (100F), with or without the use of paper treated withVCI, or stored in clean solvent.7.2 Prepared steel panels used after prolonged storage inVCI paper may have a residue of VCI that may affect theoutcome of certain coating performance tests. The VCI residuecan generally be removed by wiping the af
38、fected panel sur-face(s) several times with a clean, lint-free cloth wetted withwarm distilled water. It is important to dry the panel surfacesthoroughly immediately after wiping to prevent flash rust. Forcritical tests, the operator can verify the presence and effect ofVCI residue by testing a repr
39、esentative coating on both a panelwiped with water and on a panel coated without any wiping.8. Report8.1 The report supplied with the prepared steel panels shallinclude the following, as a minimum:8.1.1 The dimensions of the test specimens, includinglength, width and thickness,8.1.2 The composition
40、of the steel (Specifications A36/A36M, A572/A572M, A1011/A1011M or other),8.1.3 Initial surface condition (SSPC Grade A or B),8.1.4 Whether grinding of edges was employed,8.1.5 Method of degreasing,8.1.6 Degree of surface cleanliness,8.1.7 Surface profile depth (actual); average and range,8.1.8 Abra
41、sive type and size employed,8.1.9 Blast nozzle air pressure employed, and8.1.10 Method of preservation.9. Keywords9.1 abrasive; anchor pattern; blast cleaning; coatings; hot-rolled carbon steel; surface cleanliness; surface profile; testpanelsASTM International takes no position respecting the valid
42、ity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subje
43、ct to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquart
44、ers. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard
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