Galvanic corrosion, tseem hu ua bimetallic corrosion, tshwm sim thaum ob cov khoom siv hlau nrog cov khoom siv hluav taws xob sib txawv tau txuas nrog hluav taws xob thiab muab tso rau hauv tib qhov nruab nrab electrolyte. Cov hlau uas muaj peev xwm qis dua ua lub anode thiab yaj sai, thaum lub siab dua - cov khoom muaj peev xwm ua raws li cathode thiab tiv thaiv hauv paus. Rau 316 stainless hlau cua sov raj, cov khoom siv sib txuas tsis sib haum yog qhov kev txhawb nqa tseem ceeb, uas ua rau lub zos sai perforation thiab to ntawm cov yeeb nkab cua sov hauv ib lub voj voog luv luv. Daim ntawv no piav qhia txog cov ntsiab lus ntawm cov tshuaj tiv thaiv thiab tag nrho -txoj kev tiv thaiv txuas.
1. Electrochemical Tsim Txoj Cai
Thaum 316 stainless hlau nyob rau hauv corrosive kua, ib tug ruaj khov chromium - nplua nuj passive zaj duab xis rau ntawm nws nto, nthuav tawm ib tug kuj muaj peev xwm electrode. Yog hais tias nws yog ncaj qha mus cuag cov pa roj carbon steel, zoo tib yam hlau, tooj liab, txhuas thiab lwm yam hlau uas tsis muaj kev tiv thaiv passivation zoo, galvanic cell yog tsim nrog cov electrolyte raws li qhov nruab nrab conductive. Cov hlau uas tsis muaj zog corrosion kuj poob electrons thiab dissolves preferentially. Nyob rau hauv feem ntau cov xwm txheej, 316 cua sov raj ua lub anode thiab raug kev kub ntxhov hauv zos corrosion. Qhov loj dua qhov cathode cheeb tsam thiab qhov me me ntawm qhov chaw sib cuag anode, qhov nrawm dua qhov corrosion, feem ntau tsim qhov pom tseeb pitting qhov nyob ntawm thaj tsam kev sib cuag.
2. Feem ntau Galvanic Matching Combination Risks
316 cua sov raj + carbon steel txhawb nqa bracket: Cov pa roj carbon steel yog qhov yooj yim rau xeb, lub raj cua sov tiv tauj ib feem corrodes hnyav;
Stainless hlau cua sov yeeb nkab + tooj dag tooj liab fittings: tooj liab muaj peev xwm ntau dua, cov yeeb nkab stainless hlau ua cov anode thiab etched sai;
Stainless hlau lub cev tseem ceeb + hlau hlau khi thiab kho: Cov ntsiab lus sib txuas me me ua kom muaj zog tam sim no, nkag mus rau cov yeeb nkab phab ntsa hauv lub sijhawm luv;
Vuam nrog qhov sib txawv ntawm cov hlau tsis sib xws: Cov vuam tsis zoo ntawm cov khoom siv hlau ua rau qhov sib txawv ntawm qhov vuam seam, ua rau cov seam corrosion.
3. Cov Ntsiab Tseem Ceeb Ua kom muaj zog Galvanic Corrosion
Nruab nrab conductivity: siab dua ion concentration nyob rau hauv acid, brine thiab dej khib nyiab ntxiv dag zog rau electrolyte conductivity thiab speeds li electron hloov;
Sealing tsis ua hauj lwm thiab dej seepage ntawm qhov sib koom ua ke: Qhov sib txawv khaws cov kua los ua ib lub sij hawm ntev - kaw galvanic cell;
Loj cheeb tsam ntawm cathode rau anode: Ib tug loj carbon steel fixture ua ke nrog ib tug me me qhov chaw nyob rau hauv lub cua sov raj yuav ua tau zoo heev amplify corrosion tam sim no ceev;
Kev tawg ntawm stainless hlau passive zaj duab xis: qhuav hlawv, khawb thiab abrasion rhuav tshem cov txheej txheem tiv thaiv, ua rau muaj peev xwm sib txawv tseem ceeb.
4. Hierarchical tiv thaiv thiab tswj cov tswv yim
① Kev sib koom ua ke ntawm cov khoom sib tw
Txhua qhov kev sib txuas ntawm cov khoom siv, cov hlua khi, flanges, fasteners yuav tsum tau txais 316 lossis 316L stainless hlau kom tshem tawm qhov sib txawv ntawm qhov tseem ceeb thiab zam kev sib txuam bimetallic.
② Ntxiv rwb thaiv tsev cais ntawm cov hlau tsis sib xws
Yog tias kev hloov khoom siv tsis tuaj yeem paub, siv PTFE gaskets, fluororubber pads thiab lub tes tsho insulating kom cais ob yam hlau sib txawv, txiav tawm lub voj voog ntawm cov galvanic cell.
③ Txheem vuam txheej txheem
Xaiv cov vuam hlau txuam nrog cov khoom siv hauv paus nruj me ntsis; txwv tsis pub siv cov pa roj carbon zoo tib yam welding rods rau stainless hlau cua sov raj vuam los tiv thaiv cov hlau tsis sib xws.
④ Kev tiv thaiv saum npoo
Ua ib qho passivation lossis electropolishing rau lub raj cua sov kom stabilize lub peev xwm saum npoo thiab tsis muaj zog tsav lub zog ntawm cov tshuaj tiv thaiv galvanic; tsis tu ncua xyuas cov ntsiab lus txuas rau xeb thiab av tsub zuj zuj.
⑤ Tshem tawm cov dej khaws cia qhov khoob
Optimize flange thiab kev txhawb nqa qauv kom tsis txhob tuag cov ces kaum qhov nruab nrab yog daig; Tshem tawm cov kua seem nyob rau lub sijhawm ntev - lub sijhawm kaw kom xaus qhov chaw electrolyte uas yuav tsum tau muaj rau corrosion.
5. Risk Contrast Table ntawm txawv Collocation Modes
表格
| Hom kev sib dhos | Galvanic Corrosion Risk | Cov lus qhia pov tseg |
|---|---|---|
| 316 tube + 316 accessories | Tsis tsim nyog | Preferred standard configuration |
| 316 raj + carbon steel bracket | Siab heev | Insulate los yog hloov cov khoom siv bracket |
| Direct khi nrog hlau hlau | Siab heev | Tso tseg txoj kev kho no kiag li |
Xaus
Galvanic corrosion ntawm 316 cua sov raj tso siab rau peb yam tsim nyog: sib txuas hlau sib txuas, hluav taws xob conduction thiab electrolyte immersion. Ntev npaum li ib qho xwm txheej raug txiav tawm, cov txheej txheem corrosion tuaj yeem tswj tau. Standardizing cov ntaub ntawv khub, ntxiv insulating kev sib cais thiab optimizing structural drainage tsim yuav kiag li tsis txhob bimetallic corrosion puas, txo cov khoom uas npaj txhij txog tsis ua hauj lwm los ntawm cov khoom mismatching.
