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ASTM D7087-05

(Test Method)

Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments

Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected 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.

General Information

Status
Historical
Publication Date
31-Mar-2005
ICS
77.060 - Corrosion of metals
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.25 - Evaluation of Weathering Effects
Current Stage
Ref Project

Relations

Replaced By
ASTM D7087-05a - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments
Effective Date
01-Jul-2005
Referred By
ASTM D1654-08(2016)e1 - Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
Effective Date
01-Apr-2005

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ASTM D7087-05 - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive EnvironmentsASTM D7087-05 - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments
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ASTM D7087-05 - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments
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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:D7087–05
Standard Test Method for
An Imaging Technique to Measure Rust Creepage at Scribe
on Coated Test Panels Subjected to Corrosive
1
Environments
This standard is issued under the fixed designation D 7087; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 6695 Practice for Xenon-Arc Exposures of Paint and
Related Coatings
1.1 This test method covers the measurement of rust creep-
G85 Practice for Modified Salt Spray (Fog) Testing
age area from a scribe line on painted/coated flat test panels
after exposure to corrosive environments. This test method has
3. Significance and Use
the advantage of simplicity and ease of use. Expensive equip-
3.1 This test method provides a means of evaluating and
ment is not required, and the results are more accurate than
comparing development of corrosion at scribe on painted/
visual evaluation but not as precise as advanced digital
coated flat test panels after exposure to corrosive environ-
imaging.
ments.
1.2 This test method uses visual imaging software to deter-
mine the area damaged by rust creepage from the scribe.
4. Apparatus
1.3 The values stated in SI units are to be regarded as the
4.1 Transparent Plastic Sheet—Use transparent plastic
standard. The values given in parentheses are for information
sheet with thickness approximately 0.085 mm (0.0034 in. or
only.
3.4 mil). The sheet material must be transparent enough for
1.4 This standard does not purport to address all of the
easy tracing and must be sufficiently absorbent to provide good
safety concerns, if any, associated with its use. It is the
3
ink adhesion.
responsibility of the user of this standard to establish appro-
4.2 Tracing Pen—A black permanent marker with ultrafine
priate safety and health practices and determine the applica-
tip approximately 0.5 mm (0.02 in.) in diameter.
bility of regulatory limitations prior to use.
4.3 Ruler—Any transparent ruler with 1-mm black divi-
sions.Thislengthshallbeshorterthaneitherlengthorwidthof
2. Referenced Documents
2 glass surface of scanner.
2.1 ASTM Standards:
4.4 Computer and Scanning System—Any computer and
B117 Practice for Operating Salt Spray (Fog) Apparatus
compatible scanning system is applicable. A computer with at
D 1014 Practice for Conducting Exterior Exposure Tests of
4
least32MBofRAMisrecommended. Aflatbedscannerwith
Paints and Coatings on Metal Substrates
1200 dpi optical, 120032400 dpi hardware resolution is
D 1654 Test Method for Evaluation of Painted or Coated
suggested.The scanner must have a feature where it selects the
Specimens Subjected to Corrosive Environments
bestpossibleresolutionrequiredforscanning.Thereisnoneed
D 4585 Practice for Testing Water Resistance of Coatings
to calibrate or change settings while scanning.
Using Controlled Condensation
4.5 Image Software—Use any image software capable of
D 4587 Practice for Fluorescent UV-Condensation Expo-
reading an image file generated from the computer and
sure of Paint and Related Coatings
scanning system, calibrating length, and integrating area rap-
D 5894 Practice for Cyclic Salt Fog/UV Exposure of
idly and accurately.
Painted Metal, (Alternating Exposures in a Fog/Dry Cabi-
net and a UV/Condensation Cabinet)
5. Specimen Scribing
5.1 Scribe test specimens in accordance with Test Method
D 1654, section on Preliminary Treatment of Test Specimens.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
The panels should be scribed in a single straight line.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.25 on Evaluation of Weathering Effects.
Current edition approved April 1, 2005. Published April 2005.
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.
4
Standards volume information, refer to the standard’s Document Summary page on APC compatible computer with the Windows 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.
1

---------------------- Page: 1 ----------------------
D7087–05
6. Exposure of Test Specimens of the scribe. Ensure that the plastic does not move during the
rotation. Make sure the traced lines at both ends of scribe line
6.1 Prior to exposure
...

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Note 1: The following ASTM standards are not requirements. They are reference for information only: Practice B537, Specification B456, Test Method B602, and Specification B604.  
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3.1 Electrochemical corrosion rate measurements often provide results in terms of electrical current. Although the conversion of these current values into mass loss rates or penetration rates is based on Faraday’s Law, the calculations can be complicated for alloys and metals with elements having multiple valence values. This practice is intended to provide guidance in calculating mass loss and penetration rates for such alloys. Some typical values of equivalent weights for a variety of metals and alloys are provided.  
3.2 Electrochemical corrosion rate measurements may provide results in terms of electrical resistance. The conversion of these results to either mass loss or penetration rates requires additional electrochemical information. Some approaches for estimating this information are given.  
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