Scottish Gaelic

Inconel 718 yog npib tsib xee-chromium-based alloy uas feem ntau siv nyob rau hauv cov ntawv thov kub siab xws li aerospace thiab roj turbines. Ib qho ntawm cov tseem ceeb tshaj plaws hauv kev tsim cov astm b670 inconel 718 daim ntawv yog lub phaj dov. Muaj ob hom tseem ceeb ntawm inconel 718 daim hlau muaj nyob rau ntawm kev ua lag luam: kub dov thiab cov phiaj txias. Cov paib.

Hastelloy C2000 muaj nyob rau ntau qhov ntau thiab tsawg, hom no-lickel-molybdenum alloy muaj zog thiab corrosion tsis kam.

Featuring 304 Stainless Hlau Rau Heev Zoo Corrosion, Qhov kev pom zoo Weld Neck Flange tuaj yeem txuas nrog lub kaw lus weld ntawm lub caj dab. Welded thaj chaw tuaj yeem raug tshuaj xyuas yooj yim los ntawm radiography. Matched yeeb nkab thiab Flange Bore txo cov cua hlob thiab kev yaig hauv raj dej. Flange yog zoo heev rau siv nyob rau hauv koj daim ntawv thov tseem ceeb thiab yog qhov zoo rau siv nrog huab cua, dej, roj, nkev, thiab chav dej.

ASTM A312 TORP36 seamless muaj steel yeeb uns s31600 smls steel yeeb nkab
SCH40 monel 400 yeeb nkab raug xaiv raws li Werkstoff tus lej 2.4360 thiab tsis yog N04400. Alloy 400 cov kav hlau tseem hu ua monel aleloy 400 Yeeb Nkab, Monel 400 Yeeb & Nickel Alloy 400 Yeeb Nkab.
Rau mating sealing nrog cov iav nyuaj

Al6XN yog superaustenitic steel hlau nrog kev ua tau zoo rau chloride pitting, crevice corrosion thiab kev nyuaj siab corrosion tawg. Al6XN yog 6 Moly alloy uas tau tsim rau thiab siv hauv kev sib cav sib ceg siab. Nws muaj cov npib tsib xee (24%), Molybdenum (6.3%), nitriumen thiab chromium cov ntsiab lus tawg, thiab tshwj xeeb corrosion tiv thaiv. Al6XN yog feem ntau siv rau nws cov kev txhim kho pitting thiab crevice corrosion tsis kam hauv chlorides. Nws yog ib qho tsim nyog thiab weldable stainless hlau.

Nilo Alloy 36, W.NR 1.3912, Tiv Thaiv 36% Nickel-Npib thiab muaj tus nqi ntawm kev nthuav dav ntawm cov hlau.
Loj od: 1 \ / 2 "" ~ 48 ""

Tsis tas li ntawd, cov ntsiab lus siab dua ntawm chromium siv rau alloy lub kav hlau tsis kam tawm tsam oxidizing kav dej yog dab tsi li nitric acid, txog li 55% nyhav.

S32750 Welded kav yog siv nyob rau hauv ntug dej fab, tshuab thiab khoom siv dej hiav txwv, tshuaj lom neeg muag khoom, kev lag luam kub ua lag luam thiab tshuaj kub ua lag luam.

Cov qauv tshuaj pab txo qis cov hlau zoo li 304 (1.4301) thiab cov hlau ferritic zoo li 430 yog yooj yim rau kev ua thiab ua kom zoo. Raws li lawv cov npe hais, lawv muaj feem ntau ntawm ib theem, austenite lossis ferrite. Txawm hais tias cov hom no tau zoo rau ntau cov ntawv thov, muaj qee qhov kev siv txuj ci tseem ceeb hauv ob hom.

Alloy steel xov yog cov neeg xav tau tshiab uas yog cov yeeb nkab flanges i.e hu ua xov kab hauv cov kev siv sib txawv. Nws tseem yog lub npe hu ua ntsia khau flange thiab nws muaj xov hauv flange ris uas haum rau cov yeeb nkab nrog cov txiv neej sib xyaw ntawm cov yeeb nkab.

ASTM A403 FITTINGS muaj nyob rau ntau qhov ntau thiab tsawg thiab cov duab thiab muaj lub siab ntaus nqi ntawm 3000 #, 6000 #, thiab 9000 #.

Ib lub pob tw weld yeeb nkab haum yog tsim kom muaj welded rau ntawm nws cov (s) kom txuas cov yeeb nkab sib txuas ua ke thiab tso cai rau kev hloov pauv lossis lub hlab lossis xaus.

Qhov zoo tshaj plaws corrosion tsis kam rau kev tiv thaiv corrosion yog cov roj carbon hlau LF3 puag ncig bar. Carbon Steel LF3 xov paj tau muaj cov pob zeb ua kom zoo dua qub thiab cov creep tsis kam. Cov pa roj carbon hlau LF3 polishing rods muaj qhov zoo tshaj plaws tsis kam mus rau oxidation corrosion. Qhov zoo tshaj plaws vuam thiab Fabrication zoo yog pom nyob rau hauv cov pa roj carbon hlau LF3 tiaj tus. Cov Pa roj carbon hlau LF3 tuav feem ntau yog siv hauv kev tsim kho Skyscraper Txuas hniav thiab nkoj nkoj. Carbon Steel Lf3 xov cov pas nrig muaj feem ntau siv hauv cov khoom siv tshuaj. Carbon Steel Lf3 puag ncig kuj tseem siv nyob rau hauv tshav kub hloov thiab li qub.

Tus dig muag flange yog ib qho khoom siv flange raws li qhia hauv qab no. Lub hom phiaj ntawm cov no yog los thaiv tawm ib ntu ntawm cov yeeb nkab lossis lub nozzle ntawm lub nkoj uas tsis siv.

Inconel 600 puag ncig bar yog npib tsib xee-raws li benign carburization thiab zoo heev corrosion thiab kub heev. Inconel 600 cov khoom sib txuas ua haujlwm tiv thaiv kom qhuav cl2 thiab ntau lwm cov roj sib txawv ntawm cov mob me thiab kub. Alloy 600 Bar yog npib tsib xee-chromium alloy nrog zoo oxoidation decomposition decomposition decomposition thiab acid oxidation ntawm ntug dej kub.

ASME B36.19M yog tus qauv kev qhia tshwj xeeb rau cov kav hlau stainless hlau, uas qhia txog kev ua siab ntev, thiab tsim khoom rau cov kav dej thiab cov txiv ntseej.

Incoloy 800H Flange Peb muaj lub koob npe nrov hauv kev lag luam rau kev tsim cov hom kev ua haujlwm zoo ntawm cov hom uas yuav tsum tau ua rau peb cov neeg siv khoom. Peb tsim khoom tsim prololoy 800 flanges uas muaj kev ntseeg siab thiab siab dua. Peb siv cov peev txheej hwm thiab qib siab tshaj tawm rau kev tsim ASTM B564 UNFANCES 800 flanges.

Rau cov ntawv sau zeb hauv av uas xav tau cov qib qis dua uas tsis muaj cov xeb txaus tiv thaiv. Raws li 22% chromium cov ntsiab lus, lawv muaj cov ustenitic: Ferritic microstructure uas muaj zog dua, corrosion tsis kam thiab nqi-ua hauj lwm zoo.

Qhov kev haum no ces ua ib feem ntawm cov kab ke rau kev thauj cov dej (roj, roj, kua, yam ntxwv zoo, dhau los ntawm kev ncua ntev lossis ntev dua.

Lub 316 cov yeeb nkab stainless hlau tau dhau los ua cov khoom siv tsis tau rau cov kev lag luam lag luam. Qhov no alloy ntawm hlau thiab chrome tau lees paub rau nws lub siab tiv taus corrosion, nrog rau nws cov kav ntev. 316 Stainless hlau Tubing tuaj yeem tsim nyob rau hauv ob leeg seamless thiab welded leeg kom tau raws li cov neeg siv khoom xav tau.

Yeej, siv 304L tshem tawm qhov yuav tsum tau rau Anneal Welded pob qij txha ua ntej siv tag nrho daim ntawv hlau, txuag sijhawm thiab kev rau siab. Qhov tseeb, ob qho tib si 304 thiab 304L tuaj yeem siv rau ntau cov ntawv thov. Qhov sib txawv feem ntau yog qhov me me uas ib qho tsis suav hais tias muaj txiaj ntsig zoo dua lwm tus. Thaum ntau dua corrosion tsis kam, lwm yam alloys, xws li qib 316 stainless hlau, feem ntau suav hais tias yog lwm txoj.

Monel 400 yog npib tsib xee-tooj ​​liab (kwv yees li ntawm 67% Kev du dua thiab thermal conductivity zoo tagnrho rau cov khoom siv hiav txwv.

ASTM A312 TP316 yog tus qauv txheem rau kev sib khi, ncaj-leeg welded, thiab hnyav txias welded ustenitic kav hlau stainless hlau thiab kev corrosive service. Lub 316 seamless muaj steel yeeb nkab yog tsim los ntawm kev sib xyaw ntawm cov chromium, npib tsib, thiab molybdenum ua rau corrosion thiab xeb thiab xeb thiab xeb thiab xeb.

Lub ASTM A790 Duplex Welded Kav yog ib qho piv txwv ntawm welded duplex yeeb nkab. Muaj ntau cov qhab sib txawv ntawm cov kav dej duplex nrog cov khoom sib txawv cov khoom siv. Muaj cov yas, super duplex thiab leny Pawg nyob rau hauv lub duplex kav ntau yam. Lub Seamless Duplex kav yog ob qho tib si muaj zog thiab yog corrosion resistant.

ASTM A213, Tp304L, Tp306L, Tp316L, 316TI TP317, SP317, S31254, NO8367, NO8926, NO8367, NO867 Astma269TPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTPTSPTPTSP, TP317, TPP317, S31254, No8367, No8926

Alloys 800H thiab 800HT yog hlau-npib-chromium cov tshuaj muaj zog ntawm 42% hlau muaj pes tsawg leeg nrog cov ntses nominal muaj zog ntawm 42% tus ntses muaj hnub nyoog, thiab 22% chromium.

Stainless Hlau Flanges
ASTM A240 Hom 2205 Phaj yog lub Duplex phaj yog siv ntau yam kev lag luam xws li kev ua yeeb yam, roj thiab roj kev tshawb nrhiav, thiab marine engineering. Sa 240 gr 2205 daim ntawv yog tsim los ntawm qib 220) stainless hlau, uas yog kev sib xyaw ntawm ferritic thiab ustenitic steel.

S31803 yog cov qauv sau ua ke (tsis ua haujlwm) rau thawj lub duplex stainless hlau stainless. Cov txheej txheem tsis zoo tau tsim los ntawm cov pab pawg ua lag luam hauv xyoo 1970 los txo kev tsis meej pem thaum tib almoy tau hu ua ntau yam sib txawv, thiab hloov ua lwm yam. Txhua tus hlau yog sawv cev los ntawm ib tsab ntawv ua raws li tsib tus lej, qhov twg tsab ntawv sawv cev ntawm cov hlau series, i.E. s rau stainless hlau.

Tsis tas li ntawd, cov ntsiab lus siab dua ntawm chromium siv rau alloy stainless hlau 304 Seamrizing kav dej, txog 55% hnyav./ jartype

Duplex Stainless Hlau Tube
Incoloy 800h Flange
Titanium lub ntom yog li 60% uas ntawm stainless hlau thiab nickel alloys, qhov hnyav no txuag ua rau nws xaiv qhov chaw zoo uas yog qhov tseem ceeb xws li aerospace.
Stainless hlau tuav & Rods

Sa 815 s31803 Weld fittings muaj cov tshuaj lom neeg tshwj xeeb nrog rau lub zog siab dua thiab zoo ua rau xeb. Yog li cov qib kawm no yog siv rau kev tsim khoom lag luam. Sa 815 S31803 ntev \ / Luv Radius Lauj Zaub Zoo Tshaj Tawm rau Pitting, Crevice Corrosion thiab muaj kev muaj txiaj ntsig zoo. Lawv zoo tag nrho yog tias ib tug tab tom nrhiav rau cov yeeb nkab ruaj khov nrog cov qauv zoo. ASME B16.9 WPS Tsis Txaus S31803 Lub lauj tshib tseem ua rau pom kev ua kom zoo rau cov acetic thiab cov chaw muaj dej hiav txwv.

304 Piping spools yog tsim los ntawm 304 stainless hlau, ib qho khoom siv nrov thiab nrov tshaj plaws hauv ntau cov ntawv thov uas xav tau kev tiv thaiv kom xeb thiab oxidation. Cov kev tshaj lij no yog preooss siv cov machinery thiab cov txheej txheem tshwj xeeb, uas paub meej tias lawv muaj tseeb thiab ntseeg tau.
Nickel 200 flanges
Cov Hlau Hlau
jcopipe.com
Tiv Tauj Peb
Xaiv lus
Duplex Steel Tuav & Rods
Titanium tubing siab zog thiab qis ntom ntom
Forged Yeeb Nkab Fittings
Carbon Steel Qws Astm A105 Hlau Bar
Stainless Hlau Al-6xN Tube Asme Sb 676 Tsis Ua N08367 Tubing
Monel 400 YEEB RAU COV FRESE rau EYEARLASSES
Hastelloy C276 Taubhau Welded Elbows nthuav tawm txog qhov kub
ASTM B677 UN tsis muaj N08925, tsis ua tiav N08926

Cov ntsev ntsev no tuaj yeem txhim kho thaum hydrochloric acid los sib cuag nrog hlau thiab tooj liab. Yog li ntawd, yog tias cov khoom siv no ua ke nrog cov hlau lossis cov raj tooj liab hauv cov kab ke thiab cov khw muag khoom siv hydernoric tuaj yeem ua rau lub ntsej muag ua ntej ua ntej.

Txhawm rau kom xa cov raj xa dej, nws yog ib qho tsim nyog los tshem cov hose ncaj hauv cov raj xa dej. Thaum siv ntau lub raj xa dej, ntau yam kav dej yuav tsum tau siv. Thaum twg cov raj xa dej siv, lub luj tshib yuav tsum tau siv los hloov qhov loj ntawm cov raj xa dej. Thaum bifurcating, peb-txoj kev xaim cov flange kev sib txuas siv thaum lub raj xa hluav taws xob thiab kev sib txuas txias thiab kev sib tw txias thiab kev sib koom ua ke txias. , Hauv kev sib txuas ntawm ntau cov twj paj nruag, kuj tseem muaj cov txuas txuas thiab ntsaws ntawm cov twj paj nruag theem.

Monel K500 yog NOJ ZUB-HEEV Nickel-Tooj Liab Alloy uas ua ke ntawm kev ua kom zoo tshaj plaws ntawm cov xeeb ntxwv ntawm cov monel 400 nrog lub zog ntxiv ntawm kev ua kom muaj zog dua thiab hardness.

Qhov ntau ntawm cov kab yeeb nkas diameters ntawm A335 uas tuaj yeem kuaj los ntawm txhua txoj kev yuav tsum txwv los ntawm cov kev coj ua ntawm kev coj ua. Cov kev xeem sib txawv mechanical tshuab rau cov kav dej, i.e. transsitudinal los yog kev ntsuam xyuas ntev tensile, farthness lossis dabtsi yog khoov kev xeem, raug nthuav tawm.

Siab chromium, molybdenum thiab nitrogen cov ntsiab lus cuam tshuam nrog pitting tsis zoo rau cov medtenatent thiab corrosive corrosive conduction, thiab tseem ceeb pitting txias rau tag nrho cov xov xwm, thiab tseem ceeb pitting txias rau saum 50¡Ãc.

Duplex 2205 alloy yog tsim los ntawm cov chromium siab thiab qis lossis tsawg dua lub npe hu ua Nickel Conutenut.

ASTM A240 yog cov txheej txheem kev qhia tshwj xeeb rau chromium thiab chromium-npib tsib xee stainless hlau phaj, ntawv, thiab sawb rau cov ntawv thov siab thiab rau cov ntawv thov siab.

Alloy 800 yog npib npib tsib xee-chromium alloy nrog siab zog thiab kev tiv thaiv zoo rau oxidation thiab corrosion ntawm qhov kub. ASTM B407 UNICS NC08800 INCOLOY 800 W. NR. 1.4876 Welded yeeb nkab yog dav siv rau kev tsim kho cov khoom siv uas yuav tsum tau ua rau corrosion tsis kam, lub zog, thiab ruaj khov rau kev pabcuam txog 1500 ° F (816 ° C).

Nws muaj peev xwm tiv thaiv ntau yam ntawm oxidizing thiab tsis-oxidizing tshuaj, thiab cov khoom ua kom pom tseeb zoo rau pitting thiab crevice nres nyob rau hauv muaj cov chlorides thiab lwm yam.

304 Stainless hlau yog qhov feem ntau cov hlau tsis muaj. Cov hlau muaj ob txoj kev chromium (nruab nrab ntawm 18% thiab 20%) thiab thib pua (nruab nrab ntawm 8%) [1] cov hlau uas yog cov qauv hlau tseem ceeb. Nws yog Austenitic stainless hlau.When nws los txog siv, SS304 tuaj yeem pom hauv chav ua noj hauv chav dej thiab lwm yam khoom siv xws li toaster thiab microwave ncu. SS304 kuj yog siv los ua kom cov hlab ntsha siab, lub log npog zoo li rau kev ua lub tsev kws ua liaj ua teb.

Alloy 304 \ / 304l tiv taus atmospheric corrosion, nrog rau, muaj cov oxidately thiab txo cov chaw ib puag ncig. Lub alloy tau pom zoo heev rau intergranular corrosion nyob rau hauv cov as-welded mob.

Hastelloy B2 Yeeb Nkab khoov muab qhov zoo heev rau pitting corrosion thiab kev ntxhov siab ntsig txog corrosion tawg

Inconel? Alloy 718 (tsis yog n07718 \ / w.nr. 2.4668) yog lub siab-zog, corrosion-resistant nickel cov khoom siv roj hauv -423333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333332,¡Ãf. Inconel alloys tiv taus oxidation thiab muaj peev xwm tswj hwm nws cov qauv txheej txheem kev ntseeg siab nyob rau hauv cov cua sov siab.

Los ntawm nws tus kheej, npib tsib xee tau zoo tshaj plaws kub tiv taus cov khoom, tab sis thaum muaj kev sib cais nrog lwm cov khoom, nws tau txais ntau yam khoom, ib yam li muaj 600 flanges.

Titanium yeeb nkab stub kawg ib nrab li ntom raws li hlau thiab tsawg dua ob zaug kom tuab li txhuas

Alloy 800 Weld Neck Flanges Peb muaj lub koob npe nrov hauv kev lag luam rau kev tsim cov hom kev ua haujlwm zoo uas yuav haum rau peb cov neeg siv khoom. Peb tsim khoom tsim prololoy 800 flanges uas muaj kev ntseeg siab thiab siab dua. Peb siv cov peev txheej hwm thiab qib siab tshaj tawm rau kev tsim ASTM B564 UNFANCES 800 flanges.

304 Stainless hlau yog qhov feem ntau cov hlau tsis muaj. Cov hlau muaj ob txoj kev chromium (nruab nrab ntawm 18% thiab 20%) thiab thib pua (nruab nrab ntawm 8%) [1] cov hlau uas yog cov qauv hlau tseem ceeb. Nws yog Austenitic stainless hlau.When nws los txog siv, SS304 tuaj yeem pom hauv chav ua noj hauv chav dej thiab lwm yam khoom siv xws li toaster thiab microwave ncu. SS304 kuj yog siv los ua kom cov hlab ntsha siab, lub log npog zoo li rau kev ua lub tsev kws ua liaj ua teb.

Alloy 304 \ / 304l tiv taus atmospheric corrosion, nrog rau, muaj cov oxidately thiab txo cov chaw ib puag ncig. Lub alloy tau pom zoo heev rau intergranular corrosion nyob rau hauv cov as-welded mob.

Tsis suav txog N08367 tseem hu ua Alloy Al6XN yog cov carbon ntau, siab purity, nitrogen-batoy nrog zoo heev rau chloride pitting thiab compevice corrosion.

Inconel 625 coil yog cov yam ntxwv zoo los ntawm nws cov kev tiv thaiv zoo rau oxidation, qhov siab-kub corrosion thiab qaug zog. ASTM B443 tsis yog N06625 Inconel P phaj tau siv dav hauv Aerospace, kev ua lag luam thiab roj thiab muaj zog zoo dua qub txawm tias muaj ib puag ncig zoo.

Nickel-Tooj-based alloy 400 monel 2.4360 txias kos cov kab mob kev ntxhov siab thaum raug rau corrosive cracking thaum raug rau cov media corrosive nyob rau hauv ib puag ncig ib puag ncig. Monel 400 yog tooj liab thiab nickel raws li alloy uas nrov niaj hnub no vim nws qhov kev ua tau zoo. Lub alloy muaj kua qaub zoo heev thiab alkali tsis kam. Tsis tas li ntawd, nws muaj cov zog tensile muaj zog, ductility, zoo heev thermal condactivity, thiab tuaj yeem yog tawv los ntawm kev ua haujlwm txias. Ib qho ntxiv, nws tuaj yeem siv rau hauv cov ntawv thov nrog qhov kub thiab txias txij li rho tawm txog 538 degrees Celsius.

Hastelloy C2000 tub tshij yog siv nyob rau hauv ntau hom petrochemical suav nrog cov khoom siv tshuaj lom neeg, roj kev tsim khoom siv, roj ntxiv thiab cov nroj tsuag hluav taws xob.

316L 1.4401 tus yeeb nkab stainless hlau yog ib qho kev xaiv yeeb nkab zoo heev thiab cov yeeb nkab ruaj khov siv hauv ntau cov ntawv siv. Qhov no ss s31603 yeeb nkab yog tsim los ntawm cov hlau zoo 316L stainless ua rau corrosion, oxidation thiab staining rau cov chaw hnyav lossis kev siv ntxhov siab.

Nws yog dav siv nyob rau hauv cov roj pov thiab roj kev tshawb nrhiav \ / ntau lawm thiab hauv kev hloov cua sov hauv petrochemical \ / tshuaj lom neeg.

Lub unr unic s31803 (ASTM F51) Cov lus qhia tshwj xeeb tau ua rau muaj ntau dua Superseded los ntawm Unvent S32205 (1.4462, ASTM F60). Qhov no qhia txog lawv txoj kev xav kom ua kom tiav ntawm cov khoom siv alloy, ua tsaug rau kev txhim kho AOD cov txheej txheem ntawm kev tswj hwm. Ib qho ntxiv, nws tso cai rau cuam tshuam rau cov nitrogen ntxiv qib ntxiv dua li yog tam sim no yog nyob tom qab keeb kwm. Yog li ntawd, qhov siab tshaj plaws ua tiav cov qib hloov kho kom ua kom ntau cov ntsiab lus ntawm chromium (CR), Molybdenum (mo) thiab nitrogen (n).

Qhov no muab kev txhim kho zoo heev rau cov sulfuric acid. Nws kuj tseem muaj cov ntsiab lus chromium siab, kom ua kom zoo dua rau oxidizing tshuaj lom neeg cov tshuaj lom kabmob uas muaj kuab lom thiab yaj oxygen.

Inconel square kav yog zoo ib yam li lwm cov hlau stainless tab sis nrog titanium ntxiv ntawm tsawg kawg yog tsib zaug cov ntsiab lus carbon. Qhov no ntxiv rau cov kav dej sib dhos kom txo qis lossis tiv thaiv carbide nag lossis hauv 800 degree c 15% degree f kev pabcuam.
Nickel 200 flanges
Cov Hlau Hlau
jcopipe.com
Tiv Tauj Peb
Xaiv lus
Duplex Steel Tuav & Rods
Titanium tubing siab zog thiab qis ntom ntom
Forged Yeeb Nkab Fittings
Carbon Steel Qws Astm A105 Hlau Bar
Stainless Hlau Al-6xN Tube Asme Sb 676 Tsis Ua N08367 Tubing
18 nti seamless steel yeeb nkab incomple yeeb nkab

Nws cov tsos ntawm-dawb tsos kuj ua rau nws muaj txiaj ntsig rau cov txheej hlau lossis cov zaub.

304L 3 nti Yeeb Nkab - Zhengzhou Huitong Pipeline Equipment Co., Ltd.

Npib tsib xee raws 800 incoloy hexagonal yeeb nkab yog paub kom muaj qhov zoo tiv taus corrosion. Tshwj xeeb hais txog kev hais lus, tus incoloy 800 yeeb nkab muaj txaus tiv taus ob carburization zoo li oxidation corrosion.