ASTM G15-05

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: 14-Jun-2005
• ICS: 01.040.77 - Metallurgy (Vocabularies)
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals

Relations

• Replaces: ASTM G15-04 - Standard Terminology Relating to Corrosion and Corrosion Testing
• Effective Date: 15-Jun-2005
• Replaced By: ASTM G15-06 - Standard Terminology Relating to Corrosion and Corrosion Testing
• Effective Date: 01-Jul-2006
• 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: 15-Jun-2005
• Referred By: ASTM E2789-10(2021) - Standard Guide for Fretting Fatigue Testing
• Effective Date: 15-Jun-2005
• 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: 15-Jun-2005
• Referred By: ASTM G66-99(2018)e1 - Standard Test Method for Visual Assessment of Exfoliation Corrosion Susceptibility of 5XXX Series Aluminum Alloys (ASSET Test)
• Effective Date: 15-Jun-2005
• Referred By: ASTM G119-09(2021) - Standard Guide for Determining Synergism Between Wear and Corrosion
• Effective Date: 15-Jun-2005
• Referred By: ASTM D3482-07a(2023) - Standard Practice for Determining Electrolytic Corrosion of Copper by Adhesives
• Effective Date: 15-Jun-2005
• Referred By: ASTM G96-90(2018) - Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• Effective Date: 15-Jun-2005
• 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: 15-Jun-2005
• 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: 15-Jun-2005
• Referred By: ASTM F2111-22 - Standard Practice for Measuring Intergranular Attack or End Grain Pitting on Metals Caused by Aircraft Chemical Processes
• Effective Date: 15-Jun-2005
• Referred By: ASTM D6294/D6294M-13(2019) - Standard Test Method for Corrosion Resistance of Ferrous Metal Fastener Assemblies Used in Roofing and Waterproofing
• Effective Date: 15-Jun-2005
• Referred By: ASTM F1801-20 - Standard Practice for Corrosion Fatigue Testing of Metallic Implant Materials
• Effective Date: 15-Jun-2005
• Referred By: ASTM G188-05(2021) - Standard Specification for Leak Detector Solutions Intended for Use on Brasses and Other Copper Alloys
• Effective Date: 15-Jun-2005

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:G15–05
Standard Terminology Relating to
1
Corrosion and Corrosion Testing
ThisstandardisissuedunderthefixeddesignationG 15;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
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 the noble (positive) direction due to current flow. (See
polarization.)
1.1 This terminology covers commonly used terms in the
anodic protection—a technique to reduce the corrosion rate of
field of corrosion. Related terms may be found in Terminolo-
a metal by polarizing it into its passive region where
gies D16, D 4538, G40, or other ASTM terminology stan-
dissolution rates are low.
dards.AlltermsdefinedbyASTMcommitteesmaybefoundin
anolyte—the electrolyte adjacent to the anode of an electro-
the ASTM Dictionary of Engineering & Technology.
lytic cell.
2. Referenced Documents auxiliary electrode—See counter electrode.
breakdown potential—the least noble potential where pitting
2.1 ASTM Standards:
or crevice corrosion, or both, will initiate and propagate.
D16 Terminology for Paint, Related Coatings, Materials,
cathode—the electrode of an electrolytic cell at which reduc-
and Applications
tion is the principal reaction. (Electrons flow toward the
D 4538 Terminology Relating to Protective Coating and
cathode in the external circuit.)
Lining Work for Power
cathodic corrosion—corrosion of a metal when it is a cathode.
G40 Terminology Relating to Wear and Erosion
(It usually happens to metals because of a rise in pH at the
3. Terminology
cathode or as a result of the formation of hydrides.)
cathodic inhibitor—a corrosion inhibitor whose primary ac-
AC impedance—See electrochemical impedance.
tion is to slow the kinetics of the cathodic reaction, produc-
active—the negative direction of electrode potential. (Also
ing a negative shift in corrosion potential.
used to describe corrosion and its associated potential range
cathodic polarization—the change of the electrode potential
when an electrode potential is more negative than an
in the active (negative) direction due to current flow. (See
adjacent depressed corrosion rate [passive] range.)
polarization.)
anion—a negatively charged ion.
cathodic protection—a technique to reduce the corrosion rate
anode—the electrode of an electrolytic cell at which oxidation
of a metal surface by making it the cathode of an electro-
is the principal reaction. (Electrons flow away from the
chemical cell.
anode in the external circuit. It is usually the electrode where
catholyte—the electrolyte adjacent to the cathode of an
corrosion occurs and metal ions enter solution.)
electrolytic cell.
anode corrosion efficiency—the ratio of the actual corrosion
cation—a positively charged ion.
(weight loss) of an anode to the theoretical corrosion (weight
caustic cracking—stress corrosion cracking of metals in
loss) calculated by Faraday’s law from the quantity of
caustic solutions. (See also stress-corrosion cracking.)
electricity that has passed.
caustic embrittlement—See caustic cracking.
anodic inhibitor—a corrosion inhibitor whose primary action
cavitation—the formation and rapid collapse within a liquid of
is to slow the kinetics of the anodic reaction, producing a
cavities or bubbles that contain vapor or gas or both.
positive shift in corrosion potential.
cavitation corrosion—the conjoint action of cavitation-
anodic polarization—the change of the electrode potential in
erosion and corrosion.
cavitation damage—the degradation of a solid body resulting
from its exposure to cavitation. (This may include loss of
1
This terminology is under the jurisdiction of ASTM Committee G01 on
material, surface deformation, or changes in properties or
Corrosion of Metals and are the direct responsibility of Subcommittee G01.02 on
appearance.)
Terminology.
cavitation-erosion—loss of material from a solid surface due
Current edition approved June 15, 2005. Published June 2005. Originally
approved in 1971. Last previous edition approved in 2004 as G 15 – 04. to mechanical action of continuing exposure to cavitation.
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G15–05
chemical conversion coating—a protective or decorative dealloying—See parting.
nonmetallic coating produced in situ by chemical reaction of depolarization—not a preferred term. (See polarization.)
a metal with a chosen environment. (It is often used to deposit corrosion—localized corrosion under or around a
prepare the surface prior to the application of
...