1、Designation: NACE/ASTM G193 10bStandard Terminology and Acronyms Relating toCorrosion1This standard is issued under the fixed designation; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in paren
2、theses indicates the year of last reapproval.1. Scope1.1 This terminology and acronyms standard covers anddefines commonly used terms and acronyms in the field ofcorrosion. Related terms may be found in Terminologies D16,D4538, G40, or other ASTM terminology standards.1.2 This terminology and acrony
3、ms standard is a result of anagreement between NACE International and ASTM Interna-tional Committee G01 on Corrosion of Metals and may notreflect the opinions of other ASTM committees.1.3 In this terminology and acronyms standard, brackets areused for directives that follow a definition and are obvi
4、ouslynot part of it, such as, “see XXX” and “also known asXXX.” Brackets can also indicate the field of application orcontext of the definition or acronym.2. Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint, Related Coatings, Materials,and ApplicationsD2583 Test Method for Indentati
5、on Hardness of RigidPlastics by Means of a Barcol ImpressorD4538 Terminology Relating to Protective Coating andLining Work for Power Generation FacilitiesE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Method for Vickers Hardness of Metallic Materi-als3G40 Terminology Relating
6、to Wear and Erosion2.2 NACE Standards:2NACE No. 1/SSPC-SP 5 White Metal Blast CleaningNACE No. 2/SSPC-SP10 Near-White Metal Blast CleaningNACE No. 3/SSPC-SP 6 Commercial Blast CleaningNACE No. 4/SSPC-SP 7 Brush-Off Blast Cleaning2.3 SSPC Surface Preparation Standards:4SSPC-SP 1 Solvent CleaningSSPC-
7、SP 2 Hand Tool CleaningSSPC-SP 3 Power Tool CleaningSSPC-SP 8 Pickling2.4 ISO Standards:5ISO 6507-1 Metallic materials - Vickers hardness test -Part 1: Test methodISO 6508-1 Metallic materials - Rockwell hardness test -Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N,T)3. Terminology3.1 Defi
8、nitions:abrasion resistancethe ability of a coating to resist beingworn away and to maintain its original appearance andstructure when subjected to rubbing, scraping, or wear.abrasivea solid substance that, owing to its hardness,toughness, size, shape, consistency, or other properties, issuitable fo
9、r grinding, cutting, roughening, polishing, orcleaning a surface by friction or high-velocity impact.abrasive blast cleaningcleaning and roughening of a sur-face produced by the high-velocity impact of an abrasive thatis propelled by the discharge of pressurized fluid from a blastnozzle or by a mech
10、anical device such as a centrifugalblasting wheel. also referred to as abrasive blastingabrasive blastingsee abrasive blast cleaning.acceleratora chemical substance that increases the rate atwhich a chemical reaction (e.g., curing) would otherwiseoccur.AC impedancesee electrochemical impedance.acryl
11、ictype of resin polymerized from acrylic acid, meth-acrylic acid, esters of these acids, or acrylonitrile.activatora chemical substance that initiates a chemicalreaction (e.g., curing). Heat and radiation may also serve asactivators for some chemical reactions.active(1) a state of a metal surface th
12、at is corroding withoutsignificant influence of reaction product; (2) the negativedirection of electrode potential.active-passive cellan electrochemical cell in which theanode is a metal in the active state and the cathode is thesame metal in the passive state.adduct curing agenta material that is f
13、ormed by prereactingthe curing agent with a portion of the resin component of thecoating.adhesionthe state in which two surfaces are held together by1This terminology and acronyms standard is under the jurisdiction of NACE/ASTM Committee J01, Joint Committee on Corrosion, and is the direct responsi-
14、bility of Subcommittee J01.02, Working Group on Terminology.Current edition approved June 1, 2010. Published September 2010. Originallyapproved in 2009. Last previous edition approved in 2010 as G19310a. DOI:10.1520/G0193-10B.2For referenced ASTM standards, visit the ASTM Web site, www.astm.org, orc
15、ontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM Web site. For NACE standards, visit the NACE Web site, www.nace.org,or contact NACE FirstService at firstservicenace.org.3Withdrawn. The last
16、approved version of this historical standard is referencedon www.astm.org.4Available from The Society for Protective Coatings (SSPC), 40 24th St., 6thFloor, Pittsburgh, PA 15222-4656, http:/www.sspc.org.5Available from International Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, Ca
17、se postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.1 NACE International/ASTM International 2010 All rights reservedinterfacial forces, which may consist of chemical or inter-locking forces, or both.aeration cellsee differential aeration cell.aging(1) the process of exposing materials t
18、o an environ-ment for an interval of time. (2) change in metallurgicalproperties that generally occurs slowly at room temperature(natural aging) and more rapidly at higher temperature(artificial aging).air dryingprocess by which an applied wet coat converts toa dry coating film by evaporation of sol
19、vent or reaction withoxygen as a result of simple exposure to air withoutintentional addition of heat or a curing agent.airless sprayingprocess of spraying coating liquids usinghydraulic pressure, not air pressure, to atomize.alkydtype of resin formed by the reaction of polyhydricalcohols and polyba
20、sic acids, part of which is derived fromsaturated or unsaturated oils or fats.alligatoringpronounced wide cracking over the surface of acoating, which has the appearance of alligator hide.amphoteric metala metal that is susceptible to corrosion inboth acidic and alkaline environments.anaerobicabsenc
21、e of air or free (molecular) oxygen.anchor patternsee surface profile.aniona negatively charged ion.annealheat to and hold at a temperature appropriate for thespecific material and then cool at a suitable rate, for suchpurposes as reducing hardness, improving machinability, orobtaining desired prope
22、rties.anodethe electrode of an electrochemical cell at whichoxidation occurs. (Electrons flow away from the anode in theexternal circuit. It is usually the electrode where corrosionoccurs and metal ions enter solution.)anode capan electrical insulating material placed over theend of the anode at the
23、 lead wire connection.anode corrosion efficiencythe ratio of the actual corrosion(mass loss) of an anode to the theoretical corrosion (massloss) calculated from the quantity of electricity that haspassed between the anode and cathode using Faradays law.anodic inhibitora corrosion inhibitor whose pri
24、mary actionis to reduce the rate of the anodic reaction, producing apositive shift in corrosion potential.anodic polarization(1) the change of electrode potentialcaused by an anodic current flowing across the electrode/electrolyte interface; (2) a forced noble (positive) shift inelectrode potential.
25、 See polarization.anodic protectiona technique to reduce the corrosion rate ofa metal surface by polarizing that surface to a more oxidizingpotential.anodizingan electrochemical oxidation process that con-verts the surface of a metal (such as aluminum or titanium)to an oxide coating.anolytethe elect
26、rolyte adjacent to the anode of an electro-chemical cell.antifoulingpreventing fouling. See fouling.atmospheric zonethe portion of a marine structure thatextends upward from the splash zone and is exposed to sun,wind, water spray, and rain.attenuationelectrical losses in a conductor caused by cur-re
27、nt flow in the conductor.Auger electron spectroscopyanalytical technique in whichthe sample surface is irradiated with low-energy electronsand the energy spectrum of electrons emitted from thesurface is measured.austenitethe face-centered cubic crystalline phase of iron oriron-based alloys.austeniti
28、c/ferritic stainless steelsee duplex stainless steel.austenitizingforming austenite by heating iron or iron-basedalloys to a temperature in the transformation range (partialaustenitizing) or above the transformation range (completeaustenitizing).auxiliary electrodesee counter electrode.backfillmater
29、ial placed in a hole to fill the space around theanodes, vent pipe, and buried components of a cathodicprotection system.Barcol hardnessa hardness value obtained by measuring theresistance of rubbers, plastics, or coatings to indentation bya steel impressor under spring load in accordance with TestM
30、ethod D2583.barrier coating(1) a coating that has a high resistance topermeation of liquids and/or gases; (2) a coating that isapplied over a previously coated surface to prevent damageto the underlying coating during subsequent handling.beach marksthe characteristic markings on the fracturesurfaces
31、 produced by fatigue crack propagation. also knownas arrest marks, clamshell marks, and conchoidal marksbeta curvea plot of dynamic (fluctuating) interferencecurrent or related proportional voltage (ordinate) versus thecorresponding structure-to-electrolyte potentials at a se-lected location on the
32、affected structure (abscissa).binderthe nonvolatile portion of the vehicle of a formulatedcoating material.bituminous coatingan asphalt or coal-tar compound used toprovide a protective coating for a surface.blast angle(1) the angle of the blast nozzle with reference tothe surface during abrasive bla
33、st cleaning; (2) the angle ofthe abrasive particles propelled from a centrifugal blastingwheel with reference to the surface being abrasive blastcleaned.blistera dome-shaped projection on the surface of a coatingresulting from the local loss of adhesion and lifting of thefilm from an underlying coat
34、 or from the base substrate.bloomingsee blushing.blowdown(1) the injection of air or water under highpressure through a tube to the anode area for the purpose ofpurging the annular space and possibly correcting highresistance caused by gas blockage cathodic protection use;(2) the process of discharg
35、ing a significant portion of theaqueous solution in order to remove accumulated salts,deposits, and other impurities boiler or cooling water toweruse.blushingwhitening and loss of gloss of a coating, usuallyorganic, caused by moisture. also known as bloomingbracelet anodea galvanic anode with geomet
36、ry suitable fordirect attachment around the circumference of a pipeline.NACE/ASTM G193 10b2 NACE International/ASTM International 2010 All rights reservedThis may be a half-shell bracelet consisting of two semicir-cular sections or a segmented bracelet consisting of a largenumber of individual secti
37、ons.breakdown potentialthe least noble potential at whichpitting or crevice corrosion, or both, will initiate andpropagate in a specific environment.brittle fracturefracture that occurs with little or no plasticdeformation of the material. contrast with ductile fracturebrush-off blast cleaned surfac
38、ean abrasive blast cleanedsteel surface that is free of all visible contaminants andforeign matter but may have some tightly adherent millscale, rust, or coating. See NACE No. 4/SSPC-SP 7 fordetailed specification.burnishprocess of smoothing surfaces using frictional con-tact between the material an
39、d some other hard pieces of hardmaterial (e.g., hardened steel balls).calcareous coatinga layer consisting of calcium carbonateand other salts deposited on the surface. When the surface iscathodically polarized as in cathodic protection, this layer isthe result of the increased pH adjacent to the pr
40、otectedsurface.calcareous depositsee calcareous coating.carbon steelalloy of carbon and iron containing up to 2percent carbon and up to 1.65 percent manganese andresidual quantities of other elements, except those intention-ally added in specific quantities for deoxidation (usuallysilicon and/or alu
41、minum).carburizingthe absorption and diffusion of carbon into ironor an iron-based alloy in contact with a suitable carbon-aceous environment at elevated temperature.case hardeninghardening a ferrous alloy so that the outerportion, or case, is made substantially harder than the innerportion, or core
42、. Typical processes are carburizing, cyanid-ing, carbonitriding, nitriding, induction hardening, and flamehardening.casein paintwater-thinned paint with vehicle derived frommilk.catalysta chemical substance, usually present in smallamounts relative to the reactants, that increases the rate atwhich a
43、 chemical reaction (e.g., curing) would otherwiseoccur, but is not consumed in the reaction.cathodethe electrode of an electrochemical cell at whichreduction is the principal reaction. (Electrons flow towardthe cathode in the external circuit.)cathodic corrosioncorrosion of a metal when it is a cath
44、ode,usually caused by the reaction of an amphoteric metal withthe alkaline products of electrolysis.cathodic disbondmentthe destruction of adhesion betweena coating and the coated surface caused by products of acathodic reaction.cathodic inhibitora corrosion inhibitor whose primary ac-tion is to red
45、uce the rate of the cathodic reaction, producinga negative shift in corrosion potential.cathodic polarization(1) the change of electrode potentialcaused by a cathodic current flowing across the electrode/electrolyte interface; (2) a forced active (negative) shift inelectrode potential. See polarizat
46、ion.cathodic protectiona technique to reduce the corrosion rateof a metal surface by making that surface the cathode of anelectrochemical cell.catholytethe electrolyte adjacent to the cathode of anelectrochemical cell.cationa positively charged ion.caustic crackingcracking of a metal or alloy under
47、thecombined action of tensile stress and corrosion in thepresence of a strongly basic solution (e.g., sodium hydrox-ide, potassium hydroxide).caustic embrittlementan obsolete term referring to causticcracking.cavitationthe formation and rapid collapse of cavities orbubbles of vapor or gas within a l
48、iquid resulting frommechanical or hydrodynamic forces.cavitation-corrosionthe conjoint action of cavitation andcorrosion.cavitation damagethe degradation of a solid body resultingfrom its exposure to cavitation. (This may include loss ofmaterial, surface deformation, or changes in properties orappea
49、rance.)cavitation-erosionthe conjoint action of cavitation and ero-sion.cellsee electrochemical cell.cementationthe introduction of one or more elements intothe surface layer of a metal or alloy by diffusion at hightemperature. (Examples of cementation include carburizingintroduction of carbon, nitriding introduction of nitrogen,and chromizing introduction of chromium.)chalkingthe development of loose, removable powder (pig-ment) at the surface of an organic coatin
