Corroded steel phaj daim ntawv thov txheej txheem

Corroded steel phaj muaj ntau dua nyob rau niaj hnub no lub neej. Corrosion ntawm tej hlau pib ntawm qhov chaw. Qee qhov xwm txheej, xws li txhuas, txheej txheej oxide tsim rau ntawm qhov chaw, uas ua rau muaj kev cuam tshuam rau kev sib cuag nrog oxygen, yog li inhibiting corrosion. Ib txheej ntawm cov hlau oxide nyob rau hauv cov huab cua qhuav, nyias nyias kom pom ntawm qhov muag liab qab, tiv thaiv cov hlau. Txawm li cas los xij, nyob rau hauv lub xub ntiag ntawm noo noo, hlau oxide hydroxides tsim thiab cov hlau ua ntxeem tau, uas tuaj yeem nqus oxygen thiab tso cai rau kev txhim kho corrosion. Kev siv zog tau ntau xyoo los ua kom tiav lossis inhibit corrosion ntawm cov hlau los ntawm kev ntxiv lwm yam khoom rau cov hlau ntshiab, nrog rau qhov sib txawv ntawm kev ua tiav. Cov kab ntxiv rau cov hlau tuaj yeem ua kom lub zog ntawm corrosion, tab sis qee yam khoom siv tuaj yeem tiv thaiv corrosion. Ntxiv aluminium rau tooj dag ua rau nws tiv taus corrosion. Qhov tsis zoo ntawm kev siv cov ntaub ntawv tsis muaj corrosive los daws cov teeb meem corrosion yog qhov nyiam tsis muaj lub cev lub cev piv rau cov hlau qub, lossis cov nqi nce vim yog cov nqi ntawm cov alloy.

Qhov thib ob, ib txoj kev los tiv thaiv corrosion rau rusted steel daim hlau yog ntxiv cov txheej txheej ruaj khov (lossis txheej) rau cov hlau kom tiv thaiv. Cov ntaub ntawv siv hauv cov txheej txheem no txawv, tab sis feem ntau siv yog xim, yas, roj hmab, ceramics thiab lwm yam hlau uas siv rau saum npoo xws li txhuas, zinc los ntawm ntau txoj kev (xws li electroplating, kub-dip galvanizing, txau, thiab lwm yam. .), chromium los yog npib tsib xee. Thaum siv cov txheej txheem tiv thaiv txheej txheem los tiv thaiv cov qauv hlau los ntawm kev xeb, txhua tus neeg koom nrog, los ntawm cov neeg tsim khoom lag luam mus rau cov neeg pleev kob rau cov tshuaj ntsuam xyuas xim, yuav tsum muaj tsawg kawg yog ib qho kev nkag siab ntawm corrosion thiab nws cov yam ntxwv cuam tshuam. Qhov kev paub txog chemistry no yog qhov tseem ceeb.

Corroded steel phaj

3. Qhia txog keeb kwm ntawm corroded steel daim hlau. Txoj kev loj hlob ntawm weathering steel originated nyob rau hauv cov teb chaws Europe thiab lub tebchaws United States. Thaum ntxov li 1900, Cov kws tshawb fawb nyob sab Europe thiab Asmeskas tau pom tias Cu tuaj yeem txhim kho corrosion ntawm cov hlau hauv cov cua. Xyoo 1961, American Society for Testing and Materials (ASTM) pib kawm atmospheric corrosion. Nyob rau xyoo 1930, USSteel Corporation thawj zaug tsim Corten steel, corrosion-resistant, high-tensile-lub zog, tooj liab-muaj cov hlau tsis tshua muaj hlau uas tsis tau coated hauv xyoo 1960. Cov xim yog siv ncaj qha rau cov tsev thiab txuas hniav. Cov ntawv thov muaj ntau: Corten A series nrog siab P, Cu ntxiv rau Cr, Ni thiab alloyed nrog Cr, Mn thiab Cu. Corten B series kuj haum rau European thiab Japanese huab cua steels. Nws tau siv dav. Txij li thaum xyoo 1960, Tuam Tshoj tau tsim ntau cov huab cua huab cua thiab tsim qee yam ntawm nws cov qib steel, xws li Anshan Iron thiab Steel Group 08CuPVRE series, Wuhan Iron thiab Steel Group 09CuPTi series, Jinan Hlau thiab Hlau 09MnNb, thiab 10CrMoAl Shanghai Thib Peb. Hlau cog. 10CrCuSiV thiab lwm yam. Niaj hnub no, weathering steel tau dav siv raws li zoo tib yam hlau txawv teb chaws. Nws kuj tseem hais txog kev nthuav dav hauv Kev Txhim Kho, siv thiab tsim cov qib steel. Nyob ntawm kev siv, huab cua steel tuaj yeem muab faib ua cov qauv siab. Corten steel thiab weathering steel rau welded lug. Lub qub no tsuas yog siv rau cov khoom siv xws li tsheb, yees, thiab cov tsev. Nws muaj qhov zoo heev atmospheric corrosion kuj thiab feem ntau yog Cu-P system, uas cov ntsiab lus P yog nruab nrab ntawm 0.07% thiab 0.15%. Yog li ntawd, lub zog tawm los ntawm cov hlau no feem ntau qis dua 343MPa, thiab lub thickness ntawm cov hlau feem ntau tsis tshaj 16 hli. Cov American ASTM 242 series thiab Japanese JAS SPA series weathering steel belongs rau qeb no. Tam sim no, txoj kev loj hlob ntawm huab cua-resistant steel rau hom qauv no nyob rau hauv Tuam Tshoj yog ceev heev. Ntxiv rau kev xyaum ntau yam xws li 09CuPcrNi (zoo ib yam li Corten) thiab 09CuPTi (forked 09MnCuPTi), ntau yam tshiab nrog Suav cov yam ntxwv kuj tau tsim, xws li 09CuPTiRE, 09CuPRE thiab 08CuPvRE, thiab lwm yam., thiab lub teb chaws cov qauv.