ASTM G15-07

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: 31-Mar-2007
• ICS: 01.040.77 - Metallurgy (Vocabularies)
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals

Relations

• Replaces: ASTM G15-06 - Standard Terminology Relating to Corrosion and Corrosion Testing
• Effective Date: 01-Apr-2007
• Referred By: ASTM E2789-10(2021) - Standard Guide for Fretting Fatigue Testing
• Effective Date: 01-Apr-2007
• Referred By: ASTM G96-90(2018) - Standard Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
• Effective Date: 01-Apr-2007
• Referred By: ASTM D3482-07a(2023) - Standard Practice for Determining Electrolytic Corrosion of Copper by Adhesives
• Effective Date: 01-Apr-2007
• Referred By: ASTM F2111-22 - Standard Practice for Measuring Intergranular Attack or End Grain Pitting on Metals Caused by Aircraft Chemical Processes
• Effective Date: 01-Apr-2007
• Referred By: ASTM F2660-20 - Standard Test Method for Qualifying Coatings for Use on F3125 Grade A490 Structural Bolts Relative to Environmental Hydrogen Embrittlement
• Effective Date: 01-Apr-2007
• 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: 01-Apr-2007
• 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: 01-Apr-2007
• Referred By: ASTM E1749-18 - Standard Terminology Relating to Rigid Wall Relocatable Shelters
• Effective Date: 01-Apr-2007
• 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: 01-Apr-2007
• Referred By: ASTM D3310-00(2023) - Standard Test Method for Determining Corrosivity of Adhesive Materials
• Effective Date: 01-Apr-2007
• Referred By: ASTM D7548-22 - Standard Test Method for Determination of Accelerated Iron Corrosion in Petroleum Products
• Effective Date: 01-Apr-2007
• Referred By: ASTM E1823-23 - Standard Terminology Relating to Fatigue and Fracture Testing
• Effective Date: 01-Apr-2007
• Referred By: ASTM D996-23 - Standard Terminology of Packaging and Distribution Environments
• Effective Date: 01-Apr-2007
• Referred By: ASTM G119-09(2021) - Standard Guide for Determining Synergism Between Wear and Corrosion
• Effective Date: 01-Apr-2007

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:G15–07
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 noble (positive) direction due to current flow. (See polar-
ization.)
1.1 This terminology covers commonly used terms in the
anodic protection—technique to reduce the corrosion rate of a
field of corrosion. Related terms may be found in Terminolo-
metal by polarizing it into its passive region where dissolu-
gies D16, D 4538, G40, or other ASTM terminology stan-
tion rates are low.
dards.AlltermsdefinedbyASTMcommitteesmaybefoundin
anolyte—electrolyte adjacent to the anode of an electrolytic
the ASTM Dictionary of Engineering & Technology.
cell.
2. Referenced Documents auxiliary electrode—See counter electrode.
breakdown potential—least noble potential where pitting or
2.1 ASTM Standards:
crevice corrosion, or both, will initiate and propagate.
D16 Terminology for Paint, Related Coatings, Materials,
cathode—electrode of an electrolytic cell at which reduction is
and Applications
the principal reaction. (Electrons flow toward the cathode in
D 4538 Terminology Relating to Protective Coating and
the external circuit.)
Lining Work for Power Generation Facilities
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—corrosion inhibitor whose primary action
AC impedance—See electrochemical impedance.
is to slow the kinetics of the cathodic reaction, producing a
active—negative direction of electrode potential. (Also used to
negative shift in corrosion potential.
describecorrosionanditsassociatedpotentialrangewhenan
cathodic polarization—change of the electrode potential in
electrode potential is more negative than an adjacent de-
the active (negative) direction due to current flow. (See
pressed corrosion rate [passive] range.)
polarization.)
anion—negatively charged ion.
cathodic protection—techniquetoreducethecorrosionrateof
anode—electrode of an electrolytic cell at which oxidation is
a metal surface by making it the cathode of an electrochemi-
the principal reaction. (Electrons flow away from the anode
cal cell.
in the external circuit. It is usually the electrode where
catholyte—electrolyte adjacent to the cathode of an electro-
corrosion occurs and metal ions enter solution.)
lytic cell.
anode corrosion efficiency—ratio of the actual corrosion
cation—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—corrosion inhibitor whose primary action is
cavitation—formation and rapid collapse within a liquid of
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—conjoint action of cavitation-erosion
anodic polarization—change of the electrode potential in the
and corrosion.
cavitation damage—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 is the direct responsibility of Subcommittee G01.02 on
appearance.)
Terminology.
cavitation-erosion—loss of material from a solid surface due
Current edition approved April 1, 2007. Published April 2007. Originally
approved in 1971. Last previous edition approved in 2006 as G 15–06. 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.
1

---------------------- Page: 1 ----------------------
G15–07
chemical conversion coating—protective or decorative non- deposit corrosion—localized corrosion under or around a
metallic coating produced in situ by chemical reaction of a depositorcollectionofmaterialonametalsurface.(Seealso
metal with a chosen environment. (It is often used to prepare crevice corrosion.)
the surface prior to the application of an organic coating.) dezincification—See parting; specific to c
...