ASTM G15-03a

Standard Terminology Relating to Corrosion and Corrosion Testing

SCOPE
1.1 This terminology covers commonly used terms in the field of corrosion. Related terms may be found in Terminologies D 16, D 4538, G 40, or other ASTM terminology standards. All terms defined by ASTM committees may be found in the ASTM Dictionary of Engineering Technology.

General Information

• Status: Historical
• Publication Date: 09-Sep-2003
• ICS: 01.040.77 - Metallurgy (Vocabularies)
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals

Relations

• Replaces: ASTM G15-03 - Standard Terminology Relating to Corrosion and Corrosion Testing
• Effective Date: 10-Sep-2003
• Replaced By: ASTM G15-04 - Standard Terminology Relating to Corrosion and Corrosion Testing
• Effective Date: 01-Jan-2004
• Referred By: ASTM G96-90(2018) - Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• Effective Date: 10-Sep-2003
• Referred By: ASTM E1749-18 - Standard Terminology Relating to Rigid Wall Relocatable Shelters
• Effective Date: 10-Sep-2003
• Referred By: ASTM F1875-98(2022) - Standard Practice for Fretting Corrosion Testing of Modular Implant Interfaces: Hip Femoral Head-Bore and Cone Taper Interface
• Effective Date: 10-Sep-2003
• Referred By: ASTM F1801-20 - Standard Practice for Corrosion Fatigue Testing of Metallic Implant Materials
• Effective Date: 10-Sep-2003
• Referred By: ASTM G142-98(2022) - Standard Test Method for Determination of Susceptibility of Metals to Embrittlement in Hydrogen Containing Environments at High Pressure, High Temperature, or Both
• Effective Date: 10-Sep-2003
• Referred By: ASTM C1187-20a - Standard Guide for Establishing Surveillance Test Program for Boron-based Neutron Absorbing Material Systems for Use in Nuclear Fuel Storage Racks in Pool Environment
• Effective Date: 10-Sep-2003
• Referred By: ASTM E1823-23 - Standard Terminology Relating to Fatigue and Fracture Testing
• Effective Date: 10-Sep-2003
• Referred By: ASTM F2129-19a - Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements to Determine the Corrosion Susceptibility of Small Implant Devices
• Effective Date: 10-Sep-2003
• Referred By: ASTM F2111-22 - Standard Practice for Measuring Intergranular Attack or End Grain Pitting on Metals Caused by Aircraft Chemical Processes
• Effective Date: 10-Sep-2003
• Referred By: ASTM D3482-07a(2023) - Standard Practice for Determining Electrolytic Corrosion of Copper by Adhesives
• Effective Date: 10-Sep-2003
• Referred By: ASTM G165-99(2017) - Standard Practice for Determining Rail-to-Earth Resistance
• Effective Date: 10-Sep-2003
• Referred By: ASTM F3111-16 - Standard Specification for Heavy Hex Structural Bolt/Nut/Washer Assemblies, Alloy Steel, Heat Treated, 200 ksi Minimum Tensile Strength
• Effective Date: 10-Sep-2003
• Referred By: ASTM F3043-15 - Standard Specification for “Twist Off” Type Tension Control Structural Bolt/Nut/Washer Assemblies, Alloy Steel, Heat Treated, 200 ksi Minimum Tensile Strength
• Effective Date: 10-Sep-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: G 15 – 03a
Standard Terminology Relating to
1
Corrosion and Corrosion Testing
This standard is issued under the fixed designation G 15; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope anodic polarization—the change of the electrode potential in
the noble (positive) direction due to current flow. (See
1.1 This terminology covers commonly used terms in the
polarization.)
field of corrosion. Related terms may be found in Terminolo-
anodic protection—a technique to reduce the corrosion rate of
gies D 16, D 4538, G 40, or other ASTM terminology stan-
a metal by polarizing it into its passive region where
dards. All terms defined by ASTM committees may be found in
dissolution rates are low.
the ASTM Dictionary of Engineering & Technology.
anolyte—the electrolyte adjacent to the anode of an electro-
2. Referenced Documents lytic cell.
auxiliary electrode—See counter electrode.
2.1
breakdown potential—the least noble potential where pitting
D 16 Terminology for Paint, Related Coatings, Materials,
2
or crevice corrosion, or both, will initiate and propagate.
and Applications
cathode—the electrode of an electrolytic cell at which reduc-
D 4538 Terminology Relating to Protective Coating and
3
tion is the principal reaction. (Electrons flow toward the
Lining Work for Power
4
cathode in the external circuit.)
G 40 Terminology Relating to Wear and Erosion
cathodic corrosion—corrosion of a metal when it is a cathode.
3. Terminology
(It usually happens to metals because of a rise in pH at the
cathode or as a result of the formation of hydrides.)
AC impedance—See electrochemical impedance.
cathodic inhibitor—a corrosion inhibitor whose primary ac-
active—the negative direction of electrode potential. (Also
tion is to slow the kinetics of the cathodic reaction, produc-
used to describe corrosion and its associated potential range
ing a negative shift in corrosion potential.
when an electrode potential is more negative than an
cathodic polarization—the change of the electrode potential
adjacent depressed corrosion rate [passive] range.)
in the active (negative) direction due to current flow. (See
anion—a negatively charged ion.
polarization.)
anode—the electrode of an electrolytic cell at which oxidation
cathodic protection—a technique to reduce the corrosion rate
is the principal reaction. (Electrons flow away from the
of a metal surface by making it the cathode of an electro-
anode in the external circuit. It is usually the electrode where
chemical cell.
corrosion occurs and metal ions enter solution.)
catholyte—the electrolyte adjacent to the cathode of an
anode corrosion efficiency—the ratio of the actual corrosion
electrolytic cell.
(weight loss) of an anode to the theoretical corrosion (weight
cation—a positively charged ion.
loss) calculated by Faraday’s law from the quantity of
caustic cracking—stress corrosion cracking of metals in
electricity that has passed.
caustic solutions. (See also stress-corrosion cracking.)
anodic inhibitor—a corrosion inhibitor whose primary action
caustic embrittlement—See caustic cracking.
is to slow the kinetics of the anodic reaction, producing a
cavitation—the formation and rapid collapse within a liquid of
positive shift in corrosion potential.
cavities or bubbles that contain vapor or gas or both.
cavitation corrosion—the conjoint action of cavitation-
erosion and corrosion.
1
This terminology is under the jurisdiction of ASTM Committee G01 on
cavitation damage—the degradation of a solid body resulting
Corrosion of Metals and are the direct responsibility of Subcommittee G01.02 on
from its exposure to cavitation. (This may include loss of
Terminology.
Current edition approved Sept. 10, 2003. Published September 2003. Originally
material, surface deformation, or changes in properties or
approved in 1971. Last previous edition approved in 2003 as G 15 – 03.
appearance.)
2
Annual Book of ASTM Standards, Vol 06.01.
3
cavitation-erosion—loss of material from a solid surface due
Annual Book of ASTM Standards, Vol 06.02.
4
Annual Book of ASTM Standards, Vol 03.02. to mechanical action of continuing exposure to cavitation.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
G15–03a
chemical co
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