Glossary

NACE International Glossary of

Corrosion-Related Terms2010

www.nace.org

1NACE International Glossary of Corrosion-Related Terms 2010

AABRASION RESISTANCESee NACE/ASTM G 193-10a.

ABRASIVESee NACE/ASTM G 193-10a.

ABRASIVE BLAST CLEANINGSee NACE/ASTM G 193-10a.

ACCELERATORSee NACE/ASTM G 193-10a.

ACRYLICSee NACE/ASTM G 193-10a.

ACTIVATORSee NACE/ASTM G 193-10a.

ACTIVESee NACE/ASTM G 193-10a.

ACTIVE-PASSIVE CELLSee NACE/ASTM G 193-10a.

ADDUCT CURING AGENTSee NACE/ASTM G 193-10a.

ADHESIONSee NACE/ASTM G 193-10a.

AERATION CELLSee NACE/ASTM G 193-10a.

AGINGChange in metallurgical properties that generally occurs slowly at room temperature (natural aging) and more rapidly at higher temperature (artificial aging).

AIR DRYINGSee NACE/ASTM G 193-10a.

AIRLESS SPRAYINGSee NACE/ASTM G 193-10a.

ALKYDSee NACE/ASTM G 193-10a.

ALLIGATORINGSee NACE/ASTM G 193-10a.

ALLOY STEELAn iron-based alloy containing carbon (usually less than 2.5%) and manganese (usually not less than 0.25%) that contains specified minimum quantities for one or more alloying elements other than manganese, silicon, and copper, and that does not specify a minimum chromium content greater than or equal to 10%.

AMPHOTERIC METALSee NACE/ASTM G 193-10a.

ANAEROBICSee NACE/ASTM G 193-10a.

ANCHOR PATTERNSee NACE/ASTM G 193-10a.

ANIONSee NACE/ASTM G 193-10a.

ANNEALHeat to and hold at a temperature appropriate for the specific material and then cool at a suitable rate, for such purposes as reducing hardness, improving machinability, or obtaining desired properties.

ANODESee NACE/ASTM G 193-10a.

ANODE CAPSee NACE/ASTM G 193-10a.

ANODE CORROSION EFFICIENCYSee NACE/ASTM G 193-10a.

ANODIC INHIBITORSee NACE/ASTM G 193-10a.

ANODIC POLARIZATIONSee NACE/ASTM G 193-10a.

2 NACE International Glossary of Corrosion-Related Terms 2010

AANODIC PROTECTIONSee NACE/ASTM G 193-10a.

ANODIZINGSee NACE/ASTM G 193-10a.

ANOLYTESee NACE/ASTM G 193-10a.

ANTIFOULINGSee NACE/ASTM G 193-10a.

ATMOSPHERIC ZONESee NACE/ASTM G 193-10a.

ATTENUATIONSee NACE/ASTM G 193-10a.

AUGER ELECTRON SPECTROSCOPY See NACE/ASTM G 193-10a.

AUSTENITE See NACE/ASTM G 193-10a.

AUSTENITIZINGForming austenite by heating iron or iron-based alloys to a temperature in the transformation range (partial austenitizing) or above the transformation range (complete austenitizing).

AUXILIARY ELECTRODESee NACE/ASTM G 193-10a.

3NACE International Glossary of Corrosion-Related Terms 2010

BBACKFILLSee NACE/ASTM G 193-10a.

BARCOL HARDNESSSee NACE/ASTM G 193-10a.

BARRIER COATINGSee NACE/ASTM G 193-10a.

BEACH MARKSSee NACE/ASTM G 193-10a.

BETA CURVESee NACE/ASTM G 193-10a.

BINDERSee NACE/ASTM G 193-10a.

BITUMINOUS COATINGSee NACE/ASTM G 193-10a.

BLAST ANGLESee NACE/ASTM G 193-10a.

BLISTERSee NACE/ASTM G 193-10a.

BLOWDOWNSee NACE/ASTM G 193-10a.

BLUSHINGSee NACE/ASTM G 193-10a.

BRACELET ANODESee NACE/ASTM G 193-10a.

BRAZE (VERB)Join metals by flowing a thin layer (of capillary thickness) of a lower-melting-point nonferrous filler metal in the space between them.

BRINELL HARDNESSHardness value, measured in accordance with ISO 6506-1 or ASTM E 10, normally using a 10 mm diameter tungsten carbide ball and force of 29.42 kN.

BRITTLE FRACTURESee NACE/ASTM G 193-10a.

BRUSH-OFF BLAST CLEANED SURFACESee NACE/ASTM G 193-10a.

BURNISHProcess of smoothing surfaces using frictional contact between the material and some other hard pieces of material (e.g., hardened steel balls).

4 NACE International Glossary of Corrosion-Related Terms 2010

CCALCAREOUS COATINGSee NACE/ASTM G 193-10a.

CALCAREOUS DEPOSITSee NACE/ASTM G 193-10a.

CARBON STEEL(1) Alloy of carbon and iron containing up to 2% carbon

and up to 1.65% manganese and residual quantities of other elements, except those intentionally added in specific quantities for deoxidation (usually silicon and/or aluminum).

(2) An iron-based alloy containing carbon (usually less

than 2.0%) and manganese (usually not less than 0.25%) with no specified minimum quantity for any alloying element other than manganese, silicon, and copper, and that contains only an incidental amount of any element other than carbon, silicon, manganese, copper, sulfur, and phosphorus.

CARBURIZINGThe absorption and diffusion of carbon into iron or an iron-based alloy in contact with a suitable carbonaceous environment at elevated temperature.

CASE HARDENINGSee NACE/ASTM G 193-10a.

CASEIN PAINTSee NACE/ASTM G 193-10a.

CAST IRONIron-carbon alloy containing approximately 2% to 4% carbon.

CASTINGMetal that is obtained at or near its finished shape by the solidification of molten metal in a mold.

CATALYSTSee NACE/ASTM G 193-10a.

CATHODESee NACE/ASTM G 193-10a.

CATHODIC CORROSIONSee NACE/ASTM G 193-10a.

CATHODIC DISBONDMENTSee NACE/ASTM G 193-10a.

CATHODIC INHIBITORSee NACE/ASTM G 193-10a.

CATHODIC POLARIZATIONSee NACE/ASTM G 193-10a.

CATHODIC PROTECTIONSee NACE/ASTM G 193-10a.

CATHOLYTESee NACE/ASTM G 193-10a.

CATIONSee NACE/ASTM G 193-10a.

CAVITATIONSee NACE/ASTM G 193-10a.

CELL See NACE/ASTM G 193-10a.

CEMENTATIONSee NACE/ASTM G 193-10a.

CEMENTITEMicrostructural constituent of steels composed of iron carbide (Fe3C).

CHALKINGSee NACE/ASTM G 193-10a.

CHECKINGSee NACE/ASTM G 193-10a.

CHEMICAL CONVERSION COATINGSee NACE/ASTM G 193-10a.

CHEVRON PATTERNSee NACE/ASTM G 193-10a.

CHIPPINGSee NACE/ASTM G 193-10a.

5NACE International Glossary of Corrosion-Related Terms 2010

CCHLORIDE STRESS CORROSION CRACKINGSee NACE/ASTM G 193-10a.

CLEAVAGE FRACTUREA type of fracture, usually observed in crystalline materials, which is transgranular and results in bright, reflecting facets on the cleaved surface. (It is typically associated with a brittle fracture.)

COATSee NACE/ASTM G 193-10a.

COATINGSee NACE/ASTM G 193-10a.

COATING SYSTEMSee NACE/ASTM G 193-10a.

COLD CRACKINGCracking occurring at low temperatures. (See cracking.)

COLD LAPSee NACE/ASTM G 193-10a.

COLD SHUTSee NACE/ASTM G 193-10a.

COLD WORKINGDeforming metal plastically under conditions of temperature and strain rate that induce strain hardening, usually, but not necessarily, conducted at room temperature.

COMMERCIAL BLAST CLEANED SURFACESee NACE/ASTM G 193-10a.

COMPRESSIVE STRENGTHThe maximum compressive stress a material is capable of withstanding without fracture or excessive flattening based on the load applied to its original cross-sectional area.

CONCENTRATION CELLSee NACE/ASTM G 193-10a.

CONCENTRATION POLARIZATIONSee NACE/ASTM G 193-10a.

CONDUCTIVE COATINGSee NACE/ASTM G 193-10a.

CONDUCTIVE CONCRETESee NACE/ASTM G 193-10a.

CONDUCTIVITY See NACE/ASTM G 193-10a.

CONTACT CORROSIONSee NACE/ASTM G 193-10a.

CONTINUITY BONDSee NACE/ASTM G 193-10a.

CONTINUOUS ANODESee NACE/ASTM G 193-10a.

CONVERSION COATINGSee NACE/ASTM G 193-10a.

COPPER SULFATE TESTSee NACE/ASTM G 193-10a.

CORROSIONSee NACE/ASTM G 193-10a.

CORROSION FATIGUESee NACE/ASTM G 193-10a.

CORROSION INHIBITORSee NACE/ASTM G 193-10a.

CORROSION POTENTIAL (ECORR)See NACE/ASTM G 193-10a.

CORROSION RATESee NACE/ASTM G 193-10a.

6 NACE International Glossary of Corrosion-Related Terms 2010

CCORROSION RESISTANCESee NACE/ASTM G 193-10a.

CORROSION-INHIBITIVE PIGMENTA pigment that, when formulated into a liquid coating material, has the property of minimizing corrosion of the metal substrate to which the coating is applied.

CORROSIVENESSSee NACE/ASTM G 193-10a.

COUNTER ELECTRODESee NACE/ASTM G 193-10a.

COUNTERPOISESee NACE/ASTM G 193-10a.

COUPLESee NACE/ASTM G 193-10a.

CRACKINGFracture of metal along an irregular path producing a discontinuity similar to a ragged edge.

CRACKING (OF COATING)See NACE/ASTM G 193-10a.

CRATERSee NACE/ASTM G 193-10a.

CRAZINGSee NACE/ASTM G 193-10a.

CREEPSee NACE/ASTM G 193-10a.

CREEP STRENGTHThat stress which, when applied to a material at a specific elevated temperature, will cause a specified amount of elongation.

CREVICE CORROSIONSee NACE/ASTM G 193-10a.

CRITICAL HUMIDITYSee NACE/ASTM G 193-10a.

CRITICAL PITTING POTENTIAL (EP, EPP)See NACE/ASTM G 193-10a.

CURINGSee NACE/ASTM G 193-10a.

CURING AGENTSee NACE/ASTM G 193-10a.

CURING TIMESee NACE/ASTM G 193-10a.

CURRENTSee NACE/ASTM G 193-10a.

CURRENT DENSITYSee NACE/ASTM G 193-10a.

CURRENT EFFICIENCYSee NACE/ASTM G 193-10a.

7NACE International Glossary of Corrosion-Related Terms 2010

DDC DECOUPLING DEVICESee NACE/ASTM G 193-10a.

DEALLOYINGSee NACE/ASTM G 193-10a.

DECOMPOSITION POTENTIALSee NACE/ASTM G 193-10a.

DECOMPOSITION VOLTAGESee NACE/ASTM G 193-10a.

DEEP GROUNDBEDSee NACE/ASTM G 193-10a.

DELAMINATIONSee NACE/ASTM G 193-10a.

DEPOLARIZATIONSee NACE/ASTM G 193-10a.

DEPOSIT CORROSIONSee NACE/ASTM G 193-10a.

DEZINCIFICATIONSee NACE/ASTM G 193-10a.

DIELECTRIC COATINGSee NACE/ASTM G 193-10a.

DIELECTRIC SHIELDSee NACE/ASTM G 193-10a.

DIFFERENTIAL AERATION CELLSee NACE/ASTM G 193-10a.

DIFFUSION-LIMITED CURRENT DENSITYSee NACE/ASTM G 193-10a.

DISBONDMENTSee NACE/ASTM G 193-10a.

DISCONTINUITY(1) An interruption in the normal physical structure

or configuration of a coating such as cracks, laps, seams, inclusions, porosity, or holidays. A discontinuity may or may not affect the usefulness of the coating.

(2) A condition in which the electrical path of a structure is interrupted by a device that acts as a dielectric or insulating fitting.

DISSIMILAR METALSSee NACE/ASTM G 193-10a.

DOUBLE LAYERSee NACE/ASTM G 193-10a.

DOUBLER PLATESee NACE/ASTM G 193-10a.

DRAINAGESee NACE/ASTM G 193-10a.

DRIVING POTENTIALSee NACE/ASTM G 193-10a.

DRY FILM THICKNESSSee NACE/ASTM G 193-10a.

DRY SPRAYSee NACE/ASTM G 193-10a.

DRY TO HANDLESee NACE/ASTM G 193-10a.

DRY TO RECOATSee NACE/ASTM G 193-10a.

DRY TO TOUCHStage of drying or curing of an applied coating at which time it becomes tack-free.

DRYINGSee NACE/ASTM G 193-10a.

DRYING OILSee NACE/ASTM G 193-10a.

8 NACE International Glossary of Corrosion-Related Terms 2010

D DRYING TIMETime required for an applied coating to reach the desired stage of cure, hardness, or nontackiness.

DUCTILE CAST IRONCast iron that has been treated while molten with an element (usually magnesium or cerium) that spheroidizes the graphite (also called nodular cast iron).

DUCTILE FRACTUREFracture that is accompanied by noticeable plastic deformation.

DUCTILITYThe ability of a material to withstand significant plastic deformation prior to fracture. (It is often measured by the elongation or reduction in the cross-sectional area of a tensile test specimen.)

DUPLEX STAINLESS STEELStainless steel whose microstructure at room temperature consists primarily of a mixture of austenite and ferrite (also called austenitic/ferritic stainless steel).

9NACE International Glossary of Corrosion-Related Terms 2010

EELASTIC DEFORMATIONSee NACE/ASTM G 193-10a.

ELASTIC LIMITSee NACE/ASTM G 193-10a.

ELASTICITYSee NACE/ASTM G 193-10a.

ELECTRICAL INTERFERENCESee NACE/ASTM G 193-10a.

ELECTRICAL ISOLATIONSee NACE/ASTM G 193-10a.

ELECTRO-OSMOSISSee NACE/ASTM G 193-10a.

ELECTROCHEMICAL CELLSee NACE/ASTM G 193-10a.

ELECTROCHEMICAL EQUIVALENTSee NACE/ASTM G 193-10a.

ELECTROCHEMICAL POTENTIALSee NACE/ASTM G 193-10a.

ELECTRODESee NACE/ASTM G 193-10a.

ELECTRODE POTENTIALSee NACE/ASTM G 193-10a.

ELECTROKINETIC POTENTIALSee NACE/ASTM G 193-10a.

ELECTROLYTE See NACE/ASTM G 193-10a.

ELECTROLYTIC CLEANINGSee NACE/ASTM G 193-10a.

ELECTROMOTIVE FORCE SERIESSee NACE/ASTM G 193-10a.

ELLIPSOMETRYSee NACE/ASTM G 193-10a.

EMBRITTLEMENTSee NACE/ASTM G 193-10a.

EMF SERIESSee NACE/ASTM G 193-10a.

ENAMELSee NACE/ASTM G 193-10a.

END EFFECTSee NACE/ASTM G 193-10a.

ENDURANCE LIMITSee NACE/ASTM G 193-10a.

ENVIRONMENTSee NACE/ASTM G 193-10a.

ENVIRONMENTAL CRACKINGSee NACE/ASTM G 193-10a.

EPOXYSee NACE/ASTM G 193-10a.

EQUILIBRIUM POTENTIALSee NACE/ASTM G 193-10a.

EROSIONSee NACE/ASTM G 193-10a.

EROSION-CORROSIONSee NACE/ASTM G 193-10a.

EXCHANGE CURRENT DENSITYSee NACE/ASTM G 193-10a.

EXFOLIATION CORROSIONSee NACE/ASTM G 193-10a.

EXTERNAL CIRCUITSee NACE/ASTM G 193-10a.

10 NACE International Glossary of Corrosion-Related Terms 2010

FFATIGUESee NACE/ASTM G 193-10a.

FATIGUE STRENGTHSee NACE/ASTM G 193-10a.

FAULT CURRENTSee NACE/ASTM G 193-10a.

FEATHER EDGINGSee NACE/ASTM G 193-10a.

FEATHERINGSee NACE/ASTM G 193-10a.

FERRITESee NACE/ASTM G 193-10a.

FERRITIC STEELSee NACE/ASTM G 193-10a.

FERRITIC STAINLESS STEELStainless steel whose microstructure at room temperature consists predominantly of ferrite.

FIBERGLASS-REINFORCED PLASTICSee NACE/ASTM G 193-10a.

FILIFORM CORROSIONSee NACE/ASTM G 193-10a.

FILMSee NACE/ASTM G 193-10a.

FINISH COATSee NACE/ASTM G 193-10a.

FISH EYESee NACE/ASTM G 193-10a.

FORCED DRAINAGESee NACE/ASTM G 193-10a.

FOREIGN STRUCTURE See NACE/ASTM G 193-10a.

FOULINGSee NACE/ASTM G 193-10a.

FRACTOGRAPHYSee NACE/ASTM G 193-10a.

FRACTURE MECHANICSSee NACE/ASTM G 193-10a.

FREE MACHININGSee NACE/ASTM G 193-10a.

FRETTING CORROSIONSee NACE/ASTM G 193-10a.

FURANSee NACE/ASTM G 193-10a.

11NACE International Glossary of Corrosion-Related Terms 2010

GGALVANIC ANODESee NACE/ASTM G 193-10a.

GALVANIC CORROSIONSee NACE/ASTM G 193-10a.

GALVANIC COUPLESee NACE/ASTM G 193-10a.

GALVANIC CURRENTSee NACE/ASTM G 193-10a.

GALVANIC SERIESSee NACE/ASTM G 193-10a.

GALVANIZED COATINGSee NACE/ASTM G 193-10a.

GALVANIZINGSee NACE/ASTM G 193-10a.

GALVANOSTATICSee NACE/ASTM G 193-10a.

GENERAL CORROSIONSee NACE/ASTM G 193-10a.

GRAINAn individual crystal in a solid metal or alloy in which the atoms are arranged in an orderly pattern.

GRAIN BOUNDARYThe irregular junction of two adjacent grains in a metal.

GRAPHITIC CORROSIONSee NACE/ASTM G 193-10a.

GRAPHITIZATIONSee NACE/ASTM G 193-10a.

GRAY CAST IRONCast iron that displays a gray fracture as a result of the presence of flake graphite.

GRITSee NACE/ASTM G 193-10a.

GRIT BLASTINGSee NACE/ASTM G 193-10a.

GROUNDBEDSee NACE/ASTM G 193-10a.

12 NACE International Glossary of Corrosion-Related Terms 2010

HHALF CELLSee NACE/ASTM G 193-10a.

HALF-CELL POTENTIALSee NACE/ASTM G 193-10a.

HAND TOOL CLEANINGSee NACE/ASTM G 193-10a.

HARDENERSee NACE/ASTM G 193-10a.

HARDNESSResistance of metal to plastic deformation, usually by indention.

HEAT-AFFECTED ZONESee NACE/ASTM G 193-10a.

HEAT TREATMENTSee NACE/ASTM G 193-10a.

HIGH-PRESSURE WATER CLEANINGSee NACE/ASTM G 193-10a.

HIGH-PRESSURE WATERJETTINGSee NACE/ASTM G 193-10a.

HIGH-TEMPERATURE HYDROGEN ATTACKSee NACE/ASTM G 193-10a.

HOLIDAYSee NACE/ASTM G 193-10a.

HOLIDAY DETECTIONSee NACE/ASTM G 193-10a.

HOT WORKINGDeforming metal plastically at such a temperature and strain rate that recrystallization takes place simultaneously with the deformation, thus avoiding any strain hardening. (Contrast with cold working.)

HOT-DIP GALVANIZINGSee NACE/ASTM G 193-10a.

HYDROGEN BLISTERINGSee NACE/ASTM G 193-10a.

HYDROGEN EMBRITTLEMENTSee NACE/ASTM G 193-10a.

HYDROGEN-INDUCED CRACKINGSee NACE/ASTM G 193-10a.

HYDROGEN OVERVOLTAGESee NACE/ASTM G 193-10a.

HYDROGEN STRESS CRACKINGSee NACE/ASTM G 193-10a.

13NACE International Glossary of Corrosion-Related Terms 2010

IIMPACT RESISTANCEAbility of a material to resist deformation from impact.

IMPINGEMENT CORROSIONSee NACE/ASTM G 193-10a.

IMPRESSED CURRENTSee NACE/ASTM G 193-10a.

IMPRESSED CURRENT ANODESee NACE/ASTM G 193-10a.

IMPULSE DIELECTRIC TESTSee NACE/ASTM G 193-10a.

INCLUSIONSee NACE/ASTM G 193-10a.

INORGANIC ZINC-RICH COATINGSee NACE/ASTM G 193-10a.

INSTANT-OFF POTENTIALSee NACE/ASTM G 193-10a.

INTERCRYSTALLINE CORROSIONSee NACE/ASTM G 193-10a.

INTERDENDRITIC CORROSIONSee NACE/ASTM G 193-10a.

INTERFERENCE BONDSee NACE/ASTM G 193-10a.

INTERFERENCE CURRENTSee NACE/ASTM G 193-10a.

INTERGRANULAR CORROSIONSee NACE/ASTM G 193-10a.

INTERGRANULAR STRESS CORROSION CRACKINGSee NACE/ASTM G 193-10a.

INTERNAL OXIDATIONSee NACE/ASTM G 193-10a.

INTUMESCENCESee NACE/ASTM G 193-10a.

IONSee NACE/ASTM G 193-10a.

IR DROPSee NACE/ASTM G 193-10a.

IRON ROTSee NACE/ASTM G 193-10a.

ISOCORROSIONRefers to lines on a graph or chart that show constant corrosion behavior with changing composition.

K

KNIFE-LINE ATTACKSee NACE/ASTM G 193-10a.

K

K

14 NACE International Glossary of Corrosion-Related Terms 2010

LLAMELLAR CORROSIONSee NACE/ASTM G 193-10a.

LANGELIER SATURATION INDEXSee NACE/ASTM G 193-10a.

LATEX PAINTSee NACE/ASTM G 193-10a.

LEVELINGThe process whereby a wet coating flows out after application so as to minimize any surface irregularities produced by the process of application.

LIFTINGSee NACE/ASTM G 193-10a.

LINE CURRENTSee NACE/ASTM G 193-10a.

LININGSee NACE/ASTM G 193-10a.

LIQUID METAL CRACKINGSee NACE/ASTM G 193-10a.

LONG-LINE CURRENT See NACE/ASTM G 193-10a.

LOW-ALLOY STEELSteel with a total alloying element content of less than approximately 5%, but more than specified for carbon steel.

LOW-CARBON STEELSee NACE/ASTM G 193-10a.

LOW-PRESSURE WATER CLEANINGSee NACE/ASTM G 193-10a.

LUGGIN PROBESee NACE/ASTM G 193-10a.

M

MALLEABLE CAST IRONWhite cast iron that is thermally treated to convert most or all of the cementite to graphite (temper carbon).

MARTENSITESee NACE/ASTM G 193-10a.

MARTENSITIC STEELSteel in which a microstructure of martensite can be attained by quenching at a cooling rate fast enough to avoid the formation of other microstructures.

METAL DUSTINGSee NACE/ASTM G 193-10a.

METALLIZINGSee NACE/ASTM G 193-10a.

MILL SCALESee NACE/ASTM G 193-10a.

MIST COATA thin tack coat, applied as a mist of spray, used to improve adhesion of a new coat to an existing partially cured coat.

MIXED POTENTIALSee NACE/ASTM G 193-10a.

MODULUS OF ELASTICITYSee NACE/ASTM G 193-10a.

MM

15NACE International Glossary of Corrosion-Related Terms 2010

NNATURAL DRAINAGESee NACE/ASTM G 193-10a.

NEAR-WHITE METAL BLAST CLEANED SURFACESee NACE/ASTM G 193-10a.

NEGATIVE RETURNSee NACE/ASTM G 193-10a.

NERNST EQUATIONSee NACE/ASTM G 193-10a.

NERNST LAYERSee NACE/ASTM G 193-10a.

NITRIDINGCase hardening process in which nitrogen is introduced into the surface of metallic materials (most commonly ferrous alloys). Typical processes include, but are not limited to, liquid nitriding, gas nitriding, and ion or plasma nitriding.)

NOBLESee NACE/ASTM G 193-10a.

NOBLE METALSee NACE/ASTM G 193-10a.

NOBLE POTENTIALSee NACE/ASTM G 193-10a.

NODULAR CAST IRONSee ductile cast iron.

NORMALIZINGSee NACE/ASTM G 193-10a.

NOTCH PROPAGATIONThe increase in depth or length of a cut, nick, or scratch in a material when the material is stressed.

O

OPACITYSee NACE/ASTM G 193-10a.

OPEN-CIRCUIT POTENTIALSee NACE/ASTM G 193-10a.

ORANGE PEELSee NACE/ASTM G 193-10a.

ORGANIC ZINC-RICH COATINGSee NACE/ASTM G 193-10a.

OVERVOLTAGESee NACE/ASTM G 193-10a.

OXIDATIONSee NACE/ASTM G 193-10a.

OXIDATION-REDUCTION POTENTIALSee NACE/ASTM G 193-10a.

OXYGEN CONCENTRATION CELLSee NACE/ASTM G 193-10a.

OO

N

16 NACE International Glossary of Corrosion-Related Terms 2010

PPAINTSee NACE/ASTM G 193-10a.

PAINT SYSTEMSee NACE/ASTM G 193-10a.

PARTINGSee NACE/ASTM G 193-10a.

PASSIVATIONSee NACE/ASTM G 193-10a.

PASSIVATION POTENTIALSee NACE/ASTM G 193-10a.

PASSIVESee NACE/ASTM G 193-10a.

PASSIVITYSee NACE/ASTM G 193-10a.

PATINASee NACE/ASTM G 193-10a.

PEELINGDetachment or partial detachment of a coating from the substrate or undercoat.

pHSee NACE/ASTM G 193-10a.

PHOSPHATINGSee NACE/ASTM G 193-10a.

PICKLINGSee NACE/ASTM G 193-10a.

PICKLING SOLUTIONSee NACE/ASTM G 193-10a.

PIGMENTSee NACE/ASTM G 193-10a.

PINHOLE

See NACE/ASTM G 193-10a.

PIPE-TO-ELECTROLYTE POTENTIALSee NACE/ASTM G 193-10a.

PIPE-TO-SOIL POTENTIALSee NACE/ASTM G 193-10a.

PITA metal surface anomaly consisting of a cavity, usually round in shape, with depth equal to or greater than the diameter at the opening. (Contrast with crater.)

PITTINGSee NACE/ASTM G 193-10a.

PITTING FACTORSee NACE/ASTM G 193-10a.

PLASTIC DEFORMATIONSee NACE/ASTM G 193-10a.

PLASTICITYSee NACE/ASTM G 193-10a.

POLARIZATIONSee NACE/ASTM G 193-10a.

POLARIZATION ADMITTANCESee NACE/ASTM G 193-10a.

POLARIZATION CELLSee NACE/ASTM G 193-10a.

POLARIZATION CURVESee NACE/ASTM G 193-10a.

POLARIZATION DECAYSee NACE/ASTM G 193-10a.

POLARIZATION RESISTANCESee NACE/ASTM G 193-10a.

17NACE International Glossary of Corrosion-Related Terms 2010

PPOLARIZED POTENTIALSee NACE/ASTM G 193-10a.

POLYESTERSee NACE/ASTM G 193-10a.

POSTWELD HEAT TREATMENTSee NACE/ASTM G 193-10a.

POTENTIAL-pH DIAGRAMSee NACE/ASTM G 193-10a.

POTENTIODYNAMICSee NACE/ASTM G 193-10a.

POTENTIOKINETICSee NACE/ASTM G 193-10a.

POTENTIOSTATSee NACE/ASTM G 193-10a.

POTENTIOSTATICSee NACE/ASTM G 193-10a.

POT LIFESee NACE/ASTM G 193-10a.

POULTICE CORROSIONSee NACE/ASTM G 193-10a.

POURBAIX DIAGRAMSee NACE/ASTM G 193-10a.

POWER TOOL CLEANINGSee NACE/ASTM G 193-10a.

PRECIPITATION HARDENINGSee NACE/ASTM G 193-10a.

PRIMARY PASSIVE POTENTIALSee NACE/ASTM G 193-10a.

PRIME COATSee NACE/ASTM G 193-10a.

PRIMERSee NACE/ASTM G 193-10a.

PROFILOMETERSee NACE/ASTM G 193-10a.

PROTECTIVE COATINGSee NACE/ASTM G 193-10a.

Q

QUENCHED AND TEMPEREDQuench hardened and then tempered.

Q

18 NACE International Glossary of Corrosion-Related Terms 2010

RREDUCTIONSee NACE/ASTM G 193-10a.

REFERENCE ELECTRODESee NACE/ASTM G 193-10a.

REFERENCE HALF-CELLSee NACE/ASTM G 193-10a.

REINFORCEMENTSee NACE/ASTM G 193-10a.

RELATIVE HUMIDITYSee NACE/ASTM G 193-10a.

REMOTE EARTHSee NACE/ASTM G 193-10a.

RESIDUAL STRESSStress present in a component free of external forces or thermal gradients.

RESINSee NACE/ASTM G 193-10a.

RESISTIVITYSee NACE/ASTM G 193-10a.

REST POTENTIALSee NACE/ASTM G 193-10a.

REVERSIBLE POTENTIALSee NACE/ASTM G 193-10a.

RIMMED STEELSee NACE/ASTM G 193-10a.

RISERSee NACE/ASTM G 193-10a.

ROCKWELL C HARDNESSHardness value, measured in accordance with ISO 6508-1 or ASTM E 18, obtained using a diamond cone indenter and a force of 1.471 N.

RUNSee NACE/ASTM G 193-10a.

RUSTSee NACE/ASTM G 193-10a.

RUST BLOOMSee NACE/ASTM G 193-10a.

19NACE International Glossary of Corrosion-Related Terms 2010

SSACKINGSee NACE/ASTM G 193-10a.

SACRIFICIAL ANODESee NACE/ASTM G 193-10a.

SACRIFICIAL PROTECTIONSee NACE/ASTM G 193-10a.

SAGSee NACE/ASTM G 193-10a.

SCALINGSee NACE/ASTM G 193-10a.

SCANNING ELECTRON MICROSCOPESee NACE/ASTM G 193-10a.

SENSITIZING HEAT TREATMENTSee NACE/ASTM G 193-10a.

SHALLOW GROUNDBEDSee NACE/ASTM G 193-10a.

SHELF LIFESee NACE/ASTM G 193-10a.

SHIELDINGSee NACE/ASTM G 193-10a.

SHOP COATSee NACE/ASTM G 193-10a.

SHOT BLASTINGSee NACE/ASTM G 193-10a.

SHOT PEENINGSee NACE/ASTM G 193-10a.

SIGMA PHASESee NACE/ASTM G 193-10a.

SLIPSee NACE/ASTM G 193-10a.

SLOW STRAIN RATE TECHNIQUESee NACE/ASTM G 193-10a.

SLUSHING COMPOUNDSee NACE/ASTM G 193-10a.

SOLID SOLUTIONSingle crystalline phase containing two or more elements.

SOLUTION HEAT TREATMENTSee NACE/ASTM G 193-10a.

SOLVENT CLEANINGSee NACE/ASTM G 193-10a.

SPALLINGSee NACE/ASTM G 193-10a.

SPARK TESTSee NACE/ASTM G 193-10a.

SPECULAR GLOSSReflection of light in one path, as from a mirror, as opposed to diffuse reflection in all directions.

SPLASH ZONESee NACE/ASTM G 193-10a.

SPREADING RATESee NACE/ASTM G 193-10a.

STAINLESS STEELSteel containing 10.5% or more chromium, possibly with other elements added to secure special properties.

STANDARD ELECTRODE POTENTIALSee NACE/ASTM G 193-10a.

STANDARD JETTING WATERSee NACE/ASTM G 193-10a.

20 NACE International Glossary of Corrosion-Related Terms 2010

SSTEEL SHOTSee NACE/ASTM G 193-10a.

STEP POTENTIALSee NACE/ASTM G 193-10a.

STEPWISE CRACKINGSee NACE/ASTM G 193-10a.

STRAY CURRENTSee NACE/ASTM G 193-10a.

STRAY-CURRENT CORROSIONSee NACE/ASTM G 193-10a.

STRESS CORROSION CRACKINGSee NACE/ASTM G 193-10a.

STRESS RELIEVING (THERMAL) See NACE/ASTM G 193-10a.

STRUCTURE-TO-ELECTROLYTE POTENTIAL See NACE/ASTM G 193-10a.

STRUCTURE-TO-SOIL POTENTIALSee NACE/ASTM G 193-10a.

STRUCTURE-TO-STRUCTURE POTENTIALSee NACE/ASTM G 193-10a.

SUBMERGED ZONESee NACE/ASTM G 193-10a.

SUBSURFACE CORROSIONSee NACE/ASTM G 193-10a.

SULFIDATIONSee NACE/ASTM G 193-10a.

SULFIDE STRESS CRACKINGSee NACE/ASTM G 193-10a.

SURFACE POTENTIAL GRADIENTSee NACE/ASTM G 193-10a.

SURFACE PROFILESee NACE/ASTM G 193-10a.

SWEEP BLAST CLEANED SURFACESee NACE/ASTM G 193-10a.

21NACE International Glossary of Corrosion-Related Terms 2010

TTACK COATSee NACE/ASTM G 193-10a.

TAFEL PLOTSee NACE/ASTM G 193-10a.

TAFEL SLOPESee NACE/ASTM G 193-10a.

TAPE ADHESION TESTSee NACE/ASTM G 193-10a.

TARNISHSee NACE/ASTM G 193-10a.

TEMPERINGHeat treatment by heating to a temperature below the lower critical temperature for the purpose of decreasing the hardness and increasing the toughness of hardened steel, hardened cast iron, and sometimes normalized steel.

THERMAL SPRAYINGSee NACE/ASTM G 193-10a.

THERMOGALVANIC CORROSIONSee NACE/ASTM G 193-10a.

THERMOPLASTICA material capable of being repeatedly softened by heat and hardened by cooling.

THERMOPLASTIC COATINGSee NACE/ASTM G 193-10a.

THERMOSETSee NACE/ASTM G 193-10a.

THERMOSET COATINGSee NACE/ASTM G 193-10a.

THROWING POWERSee NACE/ASTM G 193-10a.

TOPCOATSee NACE/ASTM G 193-10a.

TOUCH POTENTIALSee NACE/ASTM G 193-10a.

TOUGHNESSThe ability of material to absorb energy and deform plastically before fracturing.

TRANSPASSIVE REGIONSee NACE/ASTM G 193-10a.

TUBERCLESee NACE/ASTM G 193-10a.

TUBERCULATIONSee NACE/ASTM G 193-10a.

22 NACE International Glossary of Corrosion-Related Terms 2010

UULTIMATE TENSILE STRENGTHSee NACE/ASTM G 193-10a.

ULTRAHIGH-PRESSURE WATERJETTINGSee NACE/ASTM G 193-10a.

UNDERFILM CORROSIONSee NACE/ASTM G 193-10a.

UPSETA metallurgical term meaning a hot deformation process to cause a dimensional change; in this case a thickening of metal by compressive forces.

URETHANEA coating binder, formed by reaction of an isocyanate and a polyol (hydroxyl-containing material) that produces a tough, durable, glossy protective coating with good chemical resistance.

V

VEHICLESee NACE/ASTM G 193-10a.

VICKERS HARDNESSHardness value, measured in accordance with ISO 6507-1 or ASTM E 92, obtained using a diamond pyramid indenter and one of a variety of possible applied loads.

VOIDSee NACE/ASTM G 193-10a.

VW

W

WASH PRIMERSee NACE/ASTM G 193-10a.

WATER CLEANINGSee NACE/ASTM G 193-10a.

WATERJETTINGSee NACE/ASTM G 193-10a.

WEIGHT COATINGSee NACE/ASTM G 193-10a.

WELD (VERB)Join two or more pieces of metal by applying heat and/or pressure with or without filler metal, to produce a union through localized fusion of the substrates and solidification across the interfaces.

WELD DECAYSee NACE/ASTM G 193-10a.

WELD METALThat portion of a weldment that has been molten during welding.

WELDMENTThat portion of a component on which welding has been performed, including the weld metal, the heat-affected zone (HAZ), and the adjacent parent metal.

WET FILM GAUGESee NACE/ASTM G 193-10a.

WET FILM THICKNESSSee NACE/ASTM G 193-10a.

WET SPONGE TESTSee NACE/ASTM G 193-10a.

WHITE CAST IRONCast iron that displays a white fracture as a result of the presence of cementite.

23NACE International Glossary of Corrosion-Related Terms 2010

XWHITE METAL BLAST CLEANED SURFACESee NACE/ASTM G 193-10a.

WORKING ELECTRODESee NACE/ASTM G 193-10a.

WRINKLINGFormation of a surface appearance in a coating resembling the skin of a prune, usually caused by application shortcomings.

WROUGHTSee NACE/ASTM G 193-10a.

YZ

Y

YELLOWINGDevelopment of a yellow color or cast.

YIELD POINTSee NACE/ASTM G 193-10a.

YIELD STRENGTHSee NACE/ASTM G 193-10a.

24 NACE International Glossary of Corrosion-Related Terms 2010

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