Yam tsawg kawg nkaus pom zoo 316 Stainless Hlau Sheath Phab Ntsa Thickness yog dab tsi rau lub tshuab hluav taws xob immersion rhaub ua haujlwm hauv 5% Sodium Hypochlorite Solution ntawm 40 Degrees Celsius rau Bleach Production Service?

Cov txheej txheem tshuaj lom neeg ua haujlwm tsim hluav taws xob tso cua sov rau cov khoom siv sodium hypochlorite, kev tsim tshuaj dawb thiab tshuaj tua kab mob hauv dej tau ntsib cov teeb meem loj heev thaum siv 316 stainless hlau ua cov ntaub qhwv. Sodium hypochlorite yog ib qho muaj zog oxidiser thiab yog siab -pH cov tshuaj uas ua phem rau ntau cov hlau. 316 stainless hlau yog resistant ntau dua 304 vim muaj molybdenum, tab sis nws tseem raug rau pitting, crevice corrosion thiab kev nyuaj siab corrosion cracking nyob rau hauv hypochlorite kev pab cuam, tshwj xeeb tshaj yog nyob rau hauv huab cua kub thiab concentrations. Lub phab ntsa thickness ntawm lub sheath tswj cov kev tiv thaiv corrosion thiab, qhov tseem ceeb tshaj, lub sij hawm tsim nyog rau thaj chaw pitting kom permeate phab ntsa. Kab lus no nthuav tawm qhov tsawg kawg nkaus pom zoo phab ntsa thickness rau 316 sheaths hauv dilute sodium hypochlorite kev pabcuam raws li cov ntaub ntawv tshaj tawm corrosion thiab kev paub dhau los ntawm kev lag luam tshuaj dawb.

Corrosion Mechanisms ntawm 316 Stainless Hlau nyob rau hauv Sodium Hypochlorite Solution
Sodium hypochlorite (NaOCl) yog ib qho muaj zog oxidising tus neeg saib xyuas uas khaws cov zaj duab xis passive ntawm 316 stainless hlau nyob rau hauv qhov zoo. Tab sis ntau yam xwm txheej nyiam qhov kev tawm tsam hauv zos. Lub hypochlorite ion yog cov tshuaj chloride- muaj cov oxidising tus neeg sawv cev, thiab yog li ib txhij muab cov tshuaj chloride anion hnyav thiab oxidative tej zaum yuav tsum tau ua txhaum cov zaj duab xis passive. Pitting ntawm 316 yuav tshwm sim ntawm tus nqi ntawm 0.5 - 2.0 hli hauv ib xyoos ntawm cov concentrations> 1% siv tau chlorine thiab> 35 degree. Lub pitting yog heev nyob rau hauv lub pits ncav cuag ib tug tob ntawm 1 mm nyob rau hauv lub hlis nrog me ntsis cuam tshuam rau cov cheeb tsam nyob ib ncig ntawm lub pitting. Ib lub qhov tob tob hauv lub plhaub ntawm lub rhaub dej yog txaus los ua txhaum cov phab ntsa ua rau cov txheej txheem dej nkag, hluav taws xob tsis ua hauj lwm, thiab kev sib kis ntawm cov tshuaj hypochlorite nrog cov hlau ions uas catalyze tawg. General corrosion tus nqi yog tsawg, feem ntau<0.05 mm/year, such that wall thickness is destroyed mostly by pitting not by uniform thinning. This means that raising the wall thickness will only help to a limited extent, because a pit developing in a localised weak area will penetrate a 2.0 mm wall only slightly slower than a 1.0 mm wall. The real metric is not the average thickness, but the lack of surface defects and residual stresses, which are the locations of pit initiation.

Kev cuam tshuam ntawm phab ntsa Thickness ntawm Pitting Penetration Sijhawm
Tom qab pib ntawm lub qhov dej, pitting nkag mus yog kwv yees li ntawm qhov muab cov ntsiab lus hypochlorite thiab kub. Cov txiaj ntsig ntawm kev sim immersion hauv 5% NaOCl ntawm 40℃qhia qhov pib pib tom qab 200-500 teev rau cov qauv polished ntawm 316. Pits, ib zaug tsim, loj hlob ntawm tus nqi ntawm 0.03–0.08 mm hnub −1 (txog 0.9–2.4 mm hli −1). Nyob rau ntawm tus nqi no, phab ntsa thickness ntawm 1.0 hli yuav pierced nyob rau hauv 13-33 hnub los ntawm qhov pib pib. Ib phab ntsa 2.0 hli yuav kav ntev li 22-67 hnub txij thaum pib. Lub neej ua haujlwm yog qhov suav ntawm lub sijhawm pib thiab lub sijhawm nthuav tawm. Tag nrho lub neej yog li 200-500 teev+13-33 hnub rau 1.0 hli sheath, lossis txog 20-50 hnub. Tag nrho lub neej rau 2.0 hli sheath yog 200–500 teev + 22–67 hnub lossis ~ 30–80 hnub. Lub phab ntsa tuab ntxiv tsuas yog 10-30 hnub rau lub neej uas yog kev txhim kho me me rau cov khoom siv ntxiv thiab kev nplua thermal. Vim tias cov kev pabcuam luv luv no, 316 tsis tshua tau teev tseg rau kev nkag mus tas li hauv sodium hypochlorite ntau dua 1% concentration thiab 30 degree. Yog tias yuav tsum tau siv lub neej ntev ntev ces yuav tsum siv lwm cov ntaub ntawv xws li titanium lossis cov alloys tshwj xeeb.

Yam tsawg kawg nkaus phab ntsa Thickness pom zoo rau Hypochlorite Service
Cov lus hauv qab no qhia tau hais tias qhov tsawg kawg nkaus ntawm cov phab ntsa thicknesses rau cov hluav taws xob immersion rhaub hauv sodium hypochlorite kev pab. Cov txiaj ntsig yog ua raws li kev ua haujlwm tas mus li, kev tsim qauv zoo ntawm cov kab ke kom txo tau qhov ua tau ntawm cov kab nrib pleb thiab stagnation, thiab kev lees txais cov kev pab cuam lub neej tsis tshua muaj ntsuas nyob rau hauv lub lis piam lossis hli es tsis yog xyoo.

Muaj Chlorine Concentration Solution Temperature Pitting Rate (Tom qab Initiation) Yam Tsawg Pom Zoo Phab Ntsa Thickness ntawm 316Minimum Thickness - Tag Nrho Cov Kev Pabcuam Lub Neej Xav Tau Lwm Cov Lus Pom Zoo
1 - 2% 20 - 30℃0.5 - 1.0 hli / hli 1.6 hli 2 - 4 hli Marginal Titanium nyiam dua
1 - 2% 30 - 40 o C 0.8 - 1.5 mm / hli 2.0 mm 1.5 - 3 lub hlis Titanium yog qhov kev xaiv zoo
2 - 5% 20 - 30℃0.8 - 1.5 hli / hli 2.0 hli 1.5 - 2.5 hli Titanium tsim nyog rau kev pab cuam
2 - 5% 30 - 40℃1.2 - 2.0 mm / hli 2.5 mm 1 - 2 lub hlis Titanium xav tau 5 - 10% 20 - 30℃1.5 - 2.5 mm / hli Tsis pom zoo < 1 lub hlis Siv titanium lossis Alloy C-276
Txhua qhov concentration Tshaj li 40℃2.0 - 4.0 mm / mthWeeks Tsis pom zoo Titanium lossis tsis yog- cua sov hlau
Periodical lossis batch serviceTxhua qhov kub qis dua vim ziab 1.2 - 1.6 mm Variable Txais tau rau cov ntawv tsis tseem ceeb
316 stainless hlau yog ib qho kev xaiv tsis zoo rau txhua qhov kev pabcuam sodium hypochlorite siab tshaj 2% concentration lossis 30C tsis hais txog phab ntsa tuab. Nws lub neej ua haujlwm luv luv thiab muaj peev xwm ua kom nrawm nrawm ua rau nws tsis haum rau cov txheej txheem tseem ceeb. Titanium (Qib 2 lossis Qib 7) qhia tau zoo heev tiv thaiv sodium hypochlorite nrog cov nqi corrosion<0.01 mm/year at high concentrations and temperatures. The higher initial cost of titanium – generally 3-5 times that of 316 – is rapidly repaid through prolonged service life and less maintenance.

Tsim Kev Hloov Kho rau Kev Txhim Kho 316 Sheath Lub Neej hauv Hypochlorite Kev Pabcuam
Yog hais tias 316 yuav tsum tau dilute hypochlorite cov kev pab cuam vim yog cov nqi lossis cov khoom siv, plaub qhov kev hloov kho tuaj yeem ua rau lub neej ua haujlwm ntau dua li cov lej tau muab rau hauv cov lus. 1. Ua kom muaj hypochlorite pH ntau dua 11. Cov kev daws teeb meem ntawm sodium hypochlorite tsawg dua pH 11 muaj tus nqi nrawm dua thiab muaj kev ua phem rau cov hlau tsis huv. Pitting tus nqi raug txo 50-70% nrog kev tswj pH tsis siv neeg nrog kev sib ntxiv caustic. Qhov kev hloov kho thib ob yog ua kom lub ntsej muag lub ntsej muag du li sai tau. Electropolished 316 < 0.2 micron nto tiav Lub Ra yog qis dua piv rau cov khoom siv sib txawv, uas ua rau muaj kev nce ntxiv ntawm lub sijhawm pib los ntawm qhov piv ntawm 2-4. Qhov kev hloov pauv zaum kawg yog khiav ntawm qhov qis tshaj watt ceev ua tiav. Txo qhov ceev ntawm watt ntawm 10 W / cm2 mus rau 5 W / cm2 txo qhov kub ntawm lub plhaub los ntawm 10-15 oC thiab pitting tus nqi los ntawm ~ 30-40% nyob rau hauv kub rhiab heev tswj ntawm 30-50 oC. Qhov kev hloov pauv thib plaub yog kev tu ncua sij hawm ntawm lub qhov txhab txhawm rau tshem tawm cov sediments uas tsim cov chaw rau crevice. Kev ntxuav dej txhua lub lim tiam lossis dilute acid ntxuav tuaj yeem ua rau lub neej ua haujlwm ntev. Rau feem ntau cov khoom siv tshuaj bleach ntau lawm cov kev hloov no tsis txaus los ua 316 cov khoom siv txhim khu kev qha. Rau txhua lub rhaub kom muab tso rau hauv sodium hypochlorite rau ntau tshaj li kev siv sib txuas, titanium sheaths yuav tsum tau teev tseg los ntawm cov kws tsim khoom. Tus nqi ntawm ib qho 316 lub tshuab cua sov tsis ua haujlwm, suav nrog cov khoom lag luam ploj, kev daws cov kab mob sib kis thiab kev ua haujlwm rau kev kho, feem ntau yog ntau tshaj li tus nqi ntxiv ntawm titanium. Ib txwm suav nrog qhov tseeb concentration, qhov kub thiab txias txhua hnub ntawm kev ua haujlwm thaum qhia txog kev pabcuam hypochlorite. Tus neeg muag khoom tawm tswv yim 316 rau kev pabcuam hypochlorite tas li tshaj li 2% concentration yam tsis tau hais txog cov kev txwv ntawm cov khoom siv no tsis yog muab cov lus qhia txog engineering. Nyob rau hauv cov xwm txheej uas titanium kim heev, lwm yam kev siv cua sov tuaj yeem raug txiav txim siab, piv txwv li, sab nraud tank cua sov los ntawm titanium tshav kub exchanger lossis chav txhaj tshuaj, uas tsis cuam tshuam ncaj qha rau cov hlau nrog cov tshuaj tiv thaiv hypochlorite.