Kev sib piv kev ntsuas ntawm kev tiv thaiv corrosion ntawm SUS316L stainless hlau thiab SUS304 stainless hlau
SUS316L stainless hlau txheeb ze rau SUS304 stainless hlau muaj cov yam ntxwv, uas yog, muaj molybdenum keeb, los ntawm qhov kev pom no, peb tuaj yeem xaus lus tias qhov corrosion kuj ntawm SUS316L stainless hlau yog zoo dua li qhov corrosion kuj ntawm SUS304 stainless hlau. SUS316L stainless hlau muaj corrosion kuj zoo nyob rau hauv lub pulp thiab ntawv ntau lawm txheej txheem. Thiab SUS316L stainless hlau kuj tseem tiv taus kev yaig ntawm dej hiav txwv thiab kev ua haujlwm hnyav. Thaum tshav kub kub kuj nyob rau hauv lub intermittent siv hauv qab no 1600 degrees thiab nyob rau hauv lub nruam siv hauv qab no 1700 degrees, SUS316L stainless hlau muaj zoo oxidation kuj.
Nyob nruab nrab ntawm qhov no peb yuav tsum nco ntsoov tias nyob rau hauv thaj tsam ntawm 800-1575 degrees, nws yog qhov zoo tshaj plaws kom tsis txhob ua tsis tu ncua ntawm SUS316L stainless hlau, tab sis nyob rau hauv kev siv tas li ntawm SUS316L stainless hlau sab nraum qhov kub thiab txias, cov hlau tsis muaj cua sov zoo. Kev tiv thaiv rau carbide nag lossis daus ntawm SUS316L stainless hlau yog zoo dua li ntawm SUS316 stainless hlau, muaj nyob rau hauv qhov kub thiab txias.
SUS316L stainless hlau yog qhov qis C series ntawm 316 stainless hlau, ntxiv rau muaj cov yam ntxwv zoo ib yam li 316 stainless hlau, nws tsis kam mus rau grain ciam corrosion yog zoo heev.
Tom qab tham txog kev tiv thaiv corrosion ntawm SUS316L stainless hlau, peb yuav tham txog lwm tus protagonist ntawm tsab xov xwm no, qhov tseeb, nyob rau hauv txoj cai, SUS304 stainless hlau muaj zoo heev corrosion kuj thiab zoo intergranular corrosion kuj. SUS304 stainless hlau muaj zog corrosion kuj rau oxidizing acids, xws li nitric acid nrog ib tug concentration ntawm tsawg tshaj li los yog sib npaug li 65% hauv qab kub kub. Nws kuj muaj qhov zoo corrosion kuj rau alkaline daws thiab feem ntau cov organic thiab inorganic acids. Yog li ntawd, nws yog qhov zoo los hais tias nws yog cov hlau alloy siab uas tuaj yeem tiv taus corrosion hauv huab cua lossis tshuaj corrosive media.
Ntawm no peb kuj tham txog cov khoom siv los tiv thaiv - xeb ntawm SUS304 stainless hlau, stainless hlau yog ib qho zoo nkauj nto thiab zoo corrosion kuj, tsis tas yuav mus rau plating thiab lwm yam kev kho deg, thiab ua si lub hauv paus nto ntawm stainless hlau, siv nyob rau hauv ntau yam ntawm hlau. Lub mechanism ntawm stainless hlau xeb tiv thaiv yog tias alloying ntsiab tsim ib tug ntom oxide zaj duab xis, cais oxygen tiv tauj thiab tiv thaiv oxidation txuas ntxiv. Los ntawm qhov kev pom no, nws yog ib qho yooj yim kom paub tias stainless hlau tsis yog "stainless". Vim li cas qee qhov SUS304 stainless hlau tseem muaj xeb tshwm sim? Muaj peb yam:
(1) Lub xub ntiag ntawm chloride ions nyob rau hauv ib puag ncig siv. Cov tshuaj chloride ions tau dav dav, xws li ntsev, hws, dej hiav txwv, hiav txwv cua, av thiab lwm yam. Stainless hlau nyob rau hauv lub xub ntiag ntawm chloride ions nyob rau hauv ib puag ncig, corrosion sai heev, txawm ntau tshaj li cov hlau me me, yog li muaj cov kev cai rau kev siv stainless hlau ib puag ncig, thiab feem ntau yuav tsum tau so, plua plav tawm, huv si thiab qhuav.
(2) Tsis muaj kev kho tshuaj kho mob. Cov ntsiab lus alloying tsis yaj rau hauv matrix, ua rau cov ntsiab lus tsis tshua muaj alloying thiab tsis zoo corrosion kuj ntawm cov qauv yooj yim.
(3) Cov khoom no, uas tsis muaj titanium thiab niobium, muaj lub ntuj nyiam rau intergranular corrosion. Lub intergranular corrosion yuav txo tau los ntawm kev ntxiv titanium thiab niobium thiab ces stabilizing lawv.
