ASTM D7087-05a(2010)
(Test Method)Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments (Withdrawn 2019)
Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments (Withdrawn 2019)
SIGNIFICANCE AND USE
This test method provides a means of evaluating and comparing development of corrosion at scribe on painted/coated flat test panels after exposure to corrosive environments.
SCOPE
1.1 This test method covers the measurement of rust creepage area from a scribe line on painted/coated flat test panels after exposure to corrosive environments. This test method has the advantage of simplicity and ease of use. Expensive equipment is not required, and the results are more accurate than visual evaluation but not as precise as advanced digital imaging.
1.2 This test method uses visual imaging software to determine the area damaged by rust creepage from the scribe.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
WITHDRAWN RATIONALE
This test method covers the measurement of rust creepage area from a scribe line on painted/coated flat test panels after exposure to corrosive environments. This test method has the advantage of simplicity and ease of use. Expensive equipment is not required, and the results are more accurate than visual evaluation but not as precise as advanced digital imaging.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in January 2019 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7087 − 05a (Reapproved 2010)
Standard Test Method for
An Imaging Technique to Measure Rust Creepage at Scribe
on Coated Test Panels Subjected to Corrosive
Environments
This standard is issued under the fixed designation D7087; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D5894Practice for Cyclic Salt Fog/UVExposure of Painted
Metal,(AlternatingExposuresinaFog/DryCabinetanda
1.1 This test method covers the measurement of rust creep-
UV/Condensation Cabinet)
age area from a scribe line on painted/coated flat test panels
D6695Practice for Xenon-Arc Exposures of Paint and
afterexposuretocorrosiveenvironments.Thistestmethodhas
Related Coatings
the advantage of simplicity and ease of use. Expensive equip-
G85Practice for Modified Salt Spray (Fog) Testing
ment is not required, and the results are more accurate than
visual evaluation but not as precise as advanced digital
3. Significance and Use
imaging.
3.1 This test method provides a means of evaluating and
1.2 This test method uses visual imaging software to deter-
comparing development of corrosion at scribe on painted/
mine the area damaged by rust creepage from the scribe.
coated flat test panels after exposure to corrosive environ-
1.3 The values stated in SI units are to be regarded as the ments.
standard. The values given in parentheses are for information
4. Apparatus
only.
4.1 Transparent Plastic Sheet—Usetransparentplasticsheet
1.4 This standard does not purport to address all of the
withthicknessapproximately0.085mm(0.0034in.or3.4mil).
safety concerns, if any, associated with its use. It is the
Thesheetmaterialmustbetransparentenoughforeasytracing
responsibility of the user of this standard to establish appro-
and must be sufficiently absorbent to provide good ink adhe-
priate safety and health practices and determine the applica-
sion.
bility of regulatory limitations prior to use.
4.2 Tracing Pen—A black permanent marker with ultrafine
2. Referenced Documents
tip approximately 0.5 mm (0.02 in.) in diameter.
2.1 ASTM Standards:
4.3 Ruler—Any transparent ruler with 1-mm black divi-
B117Practice for Operating Salt Spray (Fog) Apparatus
sions.Thislengthshallbeshorterthaneitherlengthorwidthof
D1014Practice for Conducting Exterior Exposure Tests of
glass surface of scanner.
Paints and Coatings on Metal Substrates
4.4 Computer and Scanning System—Any computer and
D1654Test Method for Evaluation of Painted or Coated
compatible scanning system is applicable.Acomputer with at
Specimens Subjected to Corrosive Environments
least32MBofRAMisrecommended. Aflatbedscannerwith
D4585Practice for Testing Water Resistance of Coatings
1200 dpi optical, 1200×2400 dpi hardware resolution is sug-
Using Controlled Condensation
gested. The scanner must have a feature where it selects the
D4587Practice for Fluorescent UV-Condensation Expo-
bestpossibleresolutionrequiredforscanning.Thereisnoneed
sures of Paint and Related Coatings
to calibrate or change settings while scanning.
4.5 Image Software—Use any image software capable of
This test method is under the jurisdiction of ASTM Committee D01 on Paint
reading an image file generated from the computer and
and Related Coatings, Materials, andApplications and is the direct responsibility of
scanning system, calibrating length, and integrating area rap-
Subcommittee D01.25 on Evaluation of Weathering Effects.
idly and accurately.
CurrenteditionapprovedJune1,2010.PublishedJuly2010.Originallyapproved
in 2005. Last previous edition approved in 2005 as D7087–05A. DOI: 10.1520/
D7087-05AR10.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The transparent plastic sheet material of one-gallon size zipper freezer bag
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM without surface texture was found acceptable in round robin testing.
Standards volume information, refer to the standard’s Document Summary page on APC compatible computer with theWindows 95,Windows 98,Windows ME,
the ASTM website. Windows NT, Windows 2000 or Windows XP operating system is applicable.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7087 − 05a (2010)
5. Specimen Scribing 75° angle to the surface with the upper end of pen away from
creepage.Positionthepensothatonlythetipisincontactwith
5.1 Scribe test specimens in accordance with Test Method
the surface and is at the point where the raised creepage area
D1654, section on Preliminary Treatment of Test Specimens.
begins. Halfway through the tracing, rotate the panel and the
The panels should be scribed in a single straight line.
plastic 180 degrees and complete the tracing on the other side
of the scribe. Ensure that the plastic does not move during the
6. Exposure of Test Specimens
rotation. Make sure the traced lines at both ends of scribe line
6.1 Prior to exposure, measure the width of the scribe.
areconnected.Thetracedlinemusthaveuniformintensityand
Record this information.
good continuity.
6.2 Expose test specimens in accordance with any of the
(b)On the plastic sheet, mark points i, j, k, and l on the
following Practices B117, D1014, D4585, D4587, D5894,
outsideedgeofthetracedline.Atypicaltraceofcreepagearea
D6695,andG85,oranyotherapplicabletestmethod,asagreed
developed around the scribe line (ab) and marking points i, j,
upon between the producer and the user. The exposure cycle,
k, and l for area integration are shown in Fig. 1. Note that
length of test and evaluation intervals shall be agreed upon
scribe line ab should not be traced. Remove the plastic sheet
prior to exposure of specimens.
from the panel. With the tracing pen, use a ruler to draw lines
cd and ef on the plastic sheet.
7. Procedure – Evaluation of Scribed Specimens
NOTE 1—Stain beyond the creepage area should not be traced.
7.1 Prepare Specimens for Evaluation—Prepare the scribed
NOTE 2—The tracing must be conducted carefully under good light
specimens in accordance with Test Method D1654.
condition and by an operator with good eyesight.
7.2 Quantification—Quantify the corrosion or loss of paint
NOTE 3—The intensity and continuity of traced line may be examined
with a magnifying glass or an optical microscope.
extending from a scribe mark, that is, manual tracing followed
NOTE 4—For some people, orienting the panel with scribe line
by an imaging analysis.
horizontallymaybeeasier.Tracethebottomsideofthecreepageareafirst
7.2.1 Creepage Area Tracing Technique—Trace the rust
andthentracethetopsideofcreepagearealater.Makesurethetracedlines
creepage area based on the procedure described in 7.2.1.1 and
at both ends of the scribe line are connected.
7.2.1.2.
7.2.2 Trace Scanning—Place the transparent plastic sheet
7.2.1.1 Marking Test Specimen—Place the ruler immedi-
with the traced creepage or undercutting area with marked
ately below and parallel to the scribe line ab of the test panel
points i, j, k, and l and lines cd and ef onto the glass of the
(refer to Fig. 1 for geometry terms). Use the tracing pen to
flatbed scanner. Place a ruler next to the trace area with the
mark points g and h on the test panel so that gh is the center
dimension markings facing the light source. Back the tracing
line that represents 80% of the scribe line. Mark points i, j, k,
andtherulerwithasheetofwhitepaperorcardstock.Scanthe
and l with the pen on the borderline of creepage area such that
image that must include all the traced line and the ruler. Save
linesigandkhareperpendiculartothescribeline(SeeFig.1).
this image as a .xxx file in the computer with a unique
Remove the ruler.
filename.
7.2.1.2 Area Tracing—Placeasinglesheetofthetransparent
7.2.3 Imaging and Integrating Creepage Area—Use image
plastic that is 50% larger than the panel over the entire
software capable of capturing and opening image file of trace.
corroded side of the scribed panel. Do not stretch the plastic
Calibrate distance by selecting a kn
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.