316L stainless hlau tau tshwm sim los ua cov khoom siv hluav taws xob ruaj khov tom qab kev txhim kho qis - carbon austenitic stainless hlau nyob rau nruab nrab - xyoo pua 20th. Nws lub hom phiaj tseem ceeb yog los muab kev tiv thaiv corrosion, siab - qhov kub thiab txias, thiab kev lag luam kev lag luam rau cov khoom siv raug dej, cov kua qaub me me, thiab cov tshuaj chloride uas muaj ib puag ncig. Nyob rau tib lub sijhawm, nws tau siv dav hauv cov tshuaj tso tsheb hlau luam, cov kab ua zaub mov, cov tshuab dej ntws, thiab cov cua sov ua haujlwm dav dav. Txawm hais tias 316L feem ntau raug xaiv rau nws qhov ruaj khov chromium oxide passive zaj duab xis, ntau qhov kev ua tsis tiav tiag tiag tshwm sim tsis yog los ntawm cov tshuaj tua kab mob ncaj qha tab sis los ntawm cov khoom siv tsis zoo, cov txheej txheem degradation zais cia uas tsim hauv qab cov kab mob sib kis.
Lub hauv paus ntawm underdeposit corrosion tuaj yeem taug qab mus rau ntau yam kev lag luam. Tshem tawm cov ntxhia ntsev, cov txheej txheem precipitates, cov organic colloids, thiab cov khoom siv corrosion kuj maj mam nyob ntawm lub rhaub dej thaum lub sijhawm ua haujlwm. Thaum cov deposits no tsim ib qho ntxeem tau thiab ib nrab- txheej kaw, lawv tsim microenvironments uas txawv ntawm cov kua ntau heev. Nyob rau hauv cov cua kub tas mus li, cov pa oxygen hauv qhov tso nyiaj tau noj sai heev, thaum cov tshuaj chloride, sulfate, thiab lwm yam corrosive ions ua concentrated. Qhov no ua rau lub zos acidification thiab passive zaj duab xis tawg, txawm tias thaum cov dej ntau zoo tshwm nyob rau hauv kev txwv.
Hauv kev siv tswv yim, 316L cov cua sov feem ntau ntsib qhov teeb meem no hauv batch processing tanks, intermittent circulation systems, and wastewater preheating units. Cov neeg ua haujlwm tuaj yeem saib xyuas cov cua sov kom txo qis, qhov tsis sib xws ntawm cov xim tsis sib xws, lossis qhov kev cia siab tsis tuaj yeem sawv ntev ua ntej yuav tshwm sim. Txawm li cas los xij, cov cim qhia no feem ntau raug ntaus nqi rau kev laus ib txwm tsis muaj kev tiv thaiv corrosion. Qhov txaus ntshai tshaj plaws nyob rau hauv qhov tseeb tias corrosion tuaj yeem ua tiav hauv qab cov deposits yam tsis tau kuaj pom los ntawm cov qauv kev kuaj pom.
Kev tswj kom zoo ntawm 316L cov cua sov yuav tsum yog li sib txuas cov ntaub ntawv kev paub nrog cov txheej txheem tswj. Cov tshuab lim tuaj yeem txo cov khib nyiab uas nkag mus rau hauv thaj chaw cua sov. Kev tu ib ntus pab tshem tawm cov khoom seem uas txuas nrog ua ntej lawv tsim cov hlwb ruaj khov. Lub hwj chim ceev tswj tsis pub dhau qhov kub thiab txias, uas ua rau cov dej tsis huv. Kev ntsuas thickness tsis tu ncua thiab kev kho cov yeeb yaj kiab passive tuaj yeem txuas ntxiv kev pabcuam lub neej hauv kev xav tau kev lag luam ib puag ncig.
| Cua sov hom | Kev Ruaj Ntseg Corrosion | Core Degradation Mechanism | Thaum ntxov -theem Diagnostic Feature | Qhov Tseem Ceeb Mitigation Engineering Measure |
|---|---|---|---|---|
| 316L Stainless hlau | Siab | Cov deposits uas tsis tshua muaj -oxygen, siab- ion-concentration microzones uas zom cov chromium- nplua nuj zaj duab xis | Npub nto luster, gradual efficiency poob, uneven discoloration | Cov khoom pom zoo + kev tu lub sijhawm + lub zog ceev kom zoo |
| Titanium | Nruab nrab | Cov nyiaj tso cia tsim cov kab mob sib kis, tab sis titanium oxide zaj duab xis muab kev tiv thaiv zoo dua rau kev tawm tsam hauv zos | Lub teeb tsis sib xws nyob rau hauv qhov chaw tso nyiaj | Tsis tu ncua dej ntws thiab passive zaj duab xis tshuaj xyuas |
| Fused Quartz | Tsawg | Fouling txo cov cua sov hloov tab sis tsis ua rau electrochemical corrosion | Milky dawb nto zaj duab xis ntawm pob tshab raj | Kev tu cov kua qaub niaj hnub thiab kev hloov kho cua sov |
| PFA-Jacketed | Tsis tsim nyog | Smooth inert nto txwv nruj deposit adhesion; fouling tsuas yog cuam tshuam rau kev ua haujlwm thermal | Loose tshem tau residues ntawm lub tsho nto | Txheem nto rinsing thiab efficiency xyuas |
Los xaus, underdeposit corrosion tseem yog ib qho ntawm qhov ua tau zoo tshaj plaws thiab tsis lees paub tsis ua haujlwm rau 316L immersion heaters. Nws keeb kwm yog nyob rau hauv kev sib cuam tshuam ntawm nto deposition, thermal concentration, thiab electrochemical kev ua si. Kev nkag siab txog cov txheej txheem no pab cov pab pawg saib xyuas txav mus dhau qhov kev xaiv cov khoom yooj yim thiab mus rau kev ntseeg tau ntev dua - lub sijhawm ua haujlwm.
