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ASTM D7087-05a

(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

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.

General Information

Status
Historical
Publication Date
30-Jun-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

Replaces
ASTM D7087-05 - 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
Replaced By
ASTM D7087-05a(2010) - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments (Withdrawn 2019)
Effective Date
01-Jun-2010
Referred By
ASTM D1654-08(2016)e1 - Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
Effective Date
01-Jul-2005

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ASTM D7087-05a - Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive EnvironmentsASTM D7087-05a - 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 D7087-05a - 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:D7087–05a
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 D7087; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D5894 PracticeforCyclicSaltFog/UVExposureofPainted
Metal, (Alternating Exposures in a Fog/Dry Cabinet and a
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
D6695 Practice for Xenon-Arc Exposures of Paint and
after exposure to corrosive environments. This test method has
Related Coatings
the advantage of simplicity and ease of use. Expensive equip-
G85 Practice 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
only.
4. Apparatus
1.4 This standard does not purport to address all of the
4.1 Transparent Plastic Sheet—Use transparent plastic
safety concerns, if any, associated with its use. It is the
sheet with thickness approximately 0.085 mm (0.0034 in. or
responsibility of the user of this standard to establish appro-
3.4 mil). The sheet material must be transparent enough for
priate safety and health practices and determine the applica-
easy tracing and must be sufficiently absorbent to provide good
bility of regulatory limitations prior to use.
3
ink adhesion.
2. Referenced Documents 4.2 Tracing Pen—A black permanent marker with ultrafine
2 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-
B117 Practice for Operating Salt Spray (Fog) Apparatus
sions.Thislengthshallbeshorterthaneitherlengthorwidthof
D1014 Practice 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
D1654 Test Method for Evaluation of Painted or Coated
compatible scanning system is applicable. A computer with at
Specimens Subjected to Corrosive Environments
4
least32MBofRAMisrecommended. Aflatbedscannerwith
D4585 Practice for Testing Water Resistance of Coatings
1200 dpi optical, 120032400 dpi hardware resolution is
Using Controlled Condensation
suggested.The scanner must have a feature where it selects the
D4587 Practice 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
1
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.
Current edition approved July 1, 2005. Published July 2005. Originally approved
in 2005. Last previous edition approved in 2005 as D7087 – 05. DOI: 10.1520/
D7087-05A.
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 ----------------------
D7087–05a
5. Specimen Scribing 75° angle to the surface with the upper end of pen away from
creepage. Position the pen so that only the tip is in contact with
5.1 Scribe test specimens in accordance with Test Method
the surface and is at the point where the raised creepage area
D1654, secti
...

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SCOPE
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1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements

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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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1.1 This practice covers the providing of guidance in converting the results of electrochemical measurements to rates of uniform corrosion. Calculation methods for converting corrosion current density values to either mass loss rates or average penetration rates are given for most engineering alloys. In addition, some guidelines for converting polarization resistance values to corrosion rates are provided.  
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1.4 The purpose of this terminology is to encourage uniformity and accuracy in the description of test methods and devices and in the reporting of test results in relation to wear and erosion.
Note 1: All terms are listed alphabetically. When a subsidiary term is defined in conjunction with the definition of a more generic term, an alphabetically-listed cross-reference is provided.  
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