1、Designation: NACE/ASTM G193 12cStandard 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.1. Scope1.1 This t
2、erminology 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 acronyms standard is a result of anagreement between NACE Internation
3、al 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 obviouslynot part of it, such as, “see XXX” and “also known asXXX.”
4、 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 Indentation Hardness of RigidPlastics by Means of a Barcol ImpressorD453
5、8 Terminology Relating to Protective Coating andLining Work for Power Generation FacilitiesE10 Test Method for Brinell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Method for Vickers Hardness of Metallic Materi-als3G40 Terminology Relating to We
6、ar 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-SP 2
7、Hand Tool CleaningSSPC-SP 3 Power Tool CleaningSSPC-SP 8 Pickling2.4 ISO Standards:5ISO 6506-1 Metallic materials - Brinell hardness test -Part 1: Test methodISO 6507-1 Metallic materials - Vickers hardness test -Part 1: Test methodISO 6508-1 Metallic materials - Rockwell hardness test -Part 1: Test
8、 method (scales A, B, C, D, E, F, G, H, K, N,T)3. Terminology3.1 Definitions:abrasion resistancethe ability of a material 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,t
9、oughness, size, shape, consistency, or other properties, issuitable for 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
10、 by the discharge of pressurized fluid from a blastnozzle or by a mechanical 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
11、) would otherwiseoccur.AC impedancesee electrochemical impedance.acrylictype 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 asactivato
12、rs for some chemical reactions.active(1) a state of a metal surface that 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 thes
13、ame metal in the passive state.adduct curing agenta material that is formed by prereacting1This terminology and acronyms standard is under the jurisdiction of NACE/ASTM Committee J01, Joint Committee on Corrosion, and is the direct responsi-bility of Subcommittee J01.02, Working Group on Terminology
14、.Current edition approved Oct. 1, 2012. Published October 2012. Originallyapproved in 2009. Last previous edition approved in 2012 as G19312b. DOI:10.1520/G0193-12C.2For referenced ASTM standards, visit the ASTM Web site, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual B
15、ook 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 approved version of this historical standard is referencedon
16、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, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso
17、.org.1 NACE International/ASTM International 2012 All rights reservedthe curing agent with a portion of the resin component of thecoating.adhesionthe state in which two surfaces are held together bychemical interfacial forces, mechanical interlocking forces,or both.aeration cellsee differential aera
18、tion cell.aging(1) the process of exposing materials to 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 co
19、at converts toa dry coating film by evaporation of solvent 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 f
20、ormed by the reaction of polyhydricalcohols and polybasic 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.alloy steelan iron-based alloy containing carbon (usuallyl
21、ess than 2.5 mass percent), manganese (usually greater than0.25 mass percent), and specified minimum quantities of oneor more alloying elements other than manganese, silicon,and copper, but does not contain 10.5 mass percent or greaterchromium.alternate immersionexposure to environmental cycles,each
22、 involving immersion in a fluid for a period of timefollowed by removal from that fluid for another period oftime.amphoteric metala metal that is susceptible to corrosion inboth acidic and alkaline environments.anaerobicabsence of air or free (molecular) oxygen.anchor patternsee surface profile.anio
23、na 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 properties.anodethe electrode of an electrochemical cell at whichoxidation occu
24、rs. (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 lead wire connection.anode corrosion efficiencythe ratio of the actual co
25、rrosion(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 primary actionis to reduce the rate of the anodic reaction, producing apositi
26、ve 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. See polarization.anodic protectiona technique to reduce the corrosion rat
27、e 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 electrolyte adjacent to the anode of an electro-chemical cell.antifoulingpreven
28、ting 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-rent flow in the conductor.Auger electron spectroscopyanalytical technique i
29、n 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.austenitic/ferritic stainless steelsee duplex stainless steel.austenitizingforming
30、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.backfillmaterial placed in a hole to fill the space around theanodes, vent pipe, and bu
31、ried 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 TestMethod D2583.barrier coating(1) a coating that has a high resistance toperm
32、eation of liquids and/or gases. (2) a coating that isapplied over a previously coated surface to prevent damageto the underlying coating during subsequent handling.barrier pigmenta pigment that impedes permeation throughan organic coating solely by its physical presence contrastwith corrosion-inhibi
33、tive pigment and sacrificial pig-ment.beach marksthe characteristic markings on the fracturesurfaces produced by fatigue crack propagation. also knownas arrest marks, clamshell marks, and conchoidal marksbeta curvea plot of dynamic (fluctuating) interferencecurrent or related proportional voltage (o
34、rdinate) versus thecorresponding structure-to-electrolyte potentials at a se-lected location on the 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 s
35、urface.blast angle(1) the angle of the blast nozzle with reference tothe surface during abrasive blast cleaning. (2) the angle ofNACE/ASTM G193 12c2 NACE International/ASTM International 2012 All rights reservedthe abrasive particles propelled from a centrifugal blastingwheel with reference to the s
36、urface 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 or from the base substrate.bloomingsee blushing.blowdown(1) the injection of air or water under highpressure through
37、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 discharging a significant portion of theaqueous solution in order to remove accumulated salts,deposits, and other impurities.
38、boiler or cooling water toweruseblushingwhitening and loss of gloss of a coating, usuallyorganic, caused by moisture. also known as bloomingbracelet anodea galvanic anode with geometry suitable fordirect attachment around the circumference of a pipeline.This may be a half-shell bracelet consisting o
39、f two semicir-cular sections or a segmented bracelet consisting of a largenumber of individual sections.braze(1) a bond produced as the result of heating anassembly to the brazing temperature greater than 450 C840 F and less than the solidus temperature of the basemetal using a brazing filler metal
40、distributed and retainedbetween the closely fitted faying surfaces of the joint bycapillary action. (2) the act of creating a braze.breakdown potentialthe least noble potential at whichpitting or crevice corrosion, or both, will initiate andpropagate in a specific environment.Brinell hardnesshardnes
41、s value, measured in accordancewith ISO 6506-1 or Test Method E10, usinga1to10mmdiameter tungsten carbide ball and a force of approximately9.807 to 29.420 N (1 to 3000 kgf).brittle fracturefracture that occurs with little or no plasticdeformation of the material. contrast with ductile fracturebrush-
42、off blast cleaned surfacean 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
43、 between the material and 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 increas
44、ed pH adjacent to the protectedsurface.calcareous depositsee calcareous coating.carbon steelalloy of carbon and iron containing up to 2 masspercent carbon and up to 1.65 mass percent manganese andresidual quantities of other elements, except those intention-ally added in specific quantities for deox
45、idation (usuallysilicon and/or aluminum).carburizingthe absorption and diffusion of carbon in iron oran iron-based alloy in contact with a suitable carbonaceousenvironment at elevated temperature.case hardeninghardening a ferrous alloy so that the outerportion, or case, is made substantially harder
46、than the innerportion, or core. Typical processes are carburizing, cyanid-ing, carbonitriding, nitriding, induction hardening, and flamehardening.casein paintwater-thinned paint with vehicle derived frommilk.cast irona generic term for a large family of cast ferrousalloys in which the carbon content
47、 exceeds the solubility ofcarbon in austenite at the eutectic temperature, or about 2mass percent. Most cast irons also contain silicon, and maycontain other alloying elements and impurities.casting(1) a component formed at or near its finished shapeby the solidification of liquid material in a mold
48、; (2) thecreation of such a component.catalysta chemical substance, usually present in smallamounts relative to the reactants, that increases the rate atwhich a chemical reaction (e.g., curing) would otherwiseoccur, but is not consumed in the reaction.cathodethe electrode of an electrochemical cell
49、at whichreduction is the principal reaction. (Electrons flow towardthe cathode in the external circuit.)cathodic corrosioncorrosion of a metal when it is a cathode,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 reduce the rate of
